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  • 1.
    Cao, Haiping
    et al.
    Jönköping University, School of Engineering, JTH. Research area Materials and Manufacturing - Casting. Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Wessén, Magnus
    Jönköping University, School of Engineering, JTH. Research area Materials and Manufacturing - Casting. Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Effect of Microstructure on Mechanical Properties of As-Cast Mg-Al Alloys2004In: Metallurgical and Materials Transactions. A, ISSN 1073-5623, E-ISSN 1543-1940, Vol. 35, no 1, p. 309-319Article in journal (Refereed)
  • 2.
    Ferraro, Stefano
    et al.
    University of Padova, Department of Management and Engineering.
    Bjurenstedt, Anton
    Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing – Casting.
    Seifeddine, Salem
    Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing – Casting. Swerea SWECAST, Jönköping.
    On the formation of sludge intermetallic particles in secondary aluminum alloys2015In: Metallurgical and Materials Transactions. A, ISSN 1073-5623, E-ISSN 1543-1940, Vol. 46, no 8, p. 3713-3722Article in journal (Refereed)
    Abstract [en]

    The primary precipitation of Fe-rich intermetallics in AlSi9Cu3(Fe) type alloys is studied for different Fe, Mn, and Cr contents and cooling rates. Differential scanning calorimetry, thermal analysis, and interrupted solidification with a rapid quenching technique were used in combination in order to assess the nucleation temperature of sludge particles, as well as to follow their evolution. The results revealed that the sludge nucleation temperature and the release of latent heat during sludge formation are functions of Fe, Mn, and Cr levels in the molten alloy (i.e., the sludge factor, SF) and cooling rate. Moreover, it can be concluded that sensitivity to sludge formation is not affected by cooling rate; i.e., a decrease in the SF will reduce sludge nucleation temperature to the same extent for a higher cooling rate as for a lower cooling rate. The sludge formation temperature detected will assist foundries in setting the optimal molten metal temperature for preventing sludge formation in holding furnaces and plunger systems.

  • 3.
    Hellström, Kristina
    et al.
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing.
    Diaconu, Lucian
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing.
    Diószegi, Attila
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing. Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing – Casting.
    Density and thermal expansion coefficients of liquid grey cast iron and austeniteIn: Metallurgical and Materials Transactions. A, ISSN 1073-5623, E-ISSN 1543-1940Article in journal (Other academic)
  • 4.
    Hernando, Juan Carlos
    et al.
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing. Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing – Casting.
    Domeij, Björn
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing. Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing – Casting.
    González, Daniel
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing.
    Amieva, José Manuel
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing.
    Diószegi, Attila
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing. Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing – Casting.
    New experimental technique for nodularity and Mg fading control in compacted graphite iron production on laboratory scale2017In: Metallurgical and Materials Transactions. A, ISSN 1073-5623, E-ISSN 1543-1940, Vol. 48, no 11, p. 5432-5441Article in journal (Refereed)
    Abstract [en]

    The narrow production window for compacted graphite iron material (CGI) drastically reduces the possibilities to produce it in small batches outside an industrial environment. This fact hinders laboratory-scale investigations on CGI solidification. This work presents a solution to that issue by introducing an experimental technique to produce graphitic cast iron of the main three families. Samples of a base hypereutectic spheroidal graphite iron (SGI) were re-melted in a resistance furnace under Ar atmosphere. Varying the holding time at 1723 K (1450 °C), graphitic irons ranging from spheroidal to lamellar were produced. Characterization of the graphite morphology evolution, in terms of nodularity as a function of holding time, is presented. The nodularity decay for the SGI region suggests a linear correlation with the holding time. In the CGI region, nodularity deterioration shows a slower rate, concluding with the sudden appearance of lamellar graphite. The fading process of magnesium, showing agreement with previous researchers, is described by means of empirical relations as a function of holding time and nodularity. The results on nodularity fade and number of nodules per unit area fade suggest that both phenomena occur simultaneously during the fading process of magnesium.

  • 5.
    Jarfors, Anders
    et al.
    Royal Institute of technology.
    Svendsen, L
    Royal Institute of technology.
    Wallinder, M
    Royal Institute of technology.
    Fredriksson, H
    Royal Institute of technology.
    Reactions during infiltration of graphite fibres by molten Al-Ti alloy1993In: Metallurgical and Materials Transactions. A, ISSN 1073-5623, E-ISSN 1543-1940, Vol. 24, no 11, p. 2577-2583Article in journal (Refereed)
    Abstract [en]

    The infiltration sequence of graphite fibers with liquid aluminum alloyed with titanium was studied. The titanium concentration was chosen such that a severe reaction occurred between the fibers and the melt. Aluminum carbide and titanium carbide, as well as an aluminide phase were formed. The phenomenon occurring during the infiltration sequence was explained with the aid of the ternary-phase diagram Al-Ti-C. The effect of the reaction on the infiltration height is discussed.

  • 6. Lora, Ruben
    et al.
    Diószegi, Attila
    Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing – Casting.
    Dynamic coarsening of 3.3C–1.9Si gray cast iron2012In: Metallurgical and Materials Transactions. A, ISSN 1073-5623, E-ISSN 1543-1940, Vol. 43, no 13, p. 5165-5172Article in journal (Refereed)
    Abstract [en]

    The dynamic coarsening of primary austenite has been investigated by means of interrupted solidification in a hypoeutectic gray cast iron at three different cooling rates. The fundamental characteristic of the coarsening phenomenon, which is the reduction of the total interfacial area (i.e., the primary austenite surface) over time, has been investigated along the solidification interval for the first time in gray cast iron. The primary austenite surface is confirmed to decrease with increasing solidification time. The relation between primary austenite surface reduction and the secondary dendrite arm spacing is reported as well as the time dependence of the inverse surface area of the primary phase per unit volume. The primary austenite surface has been determined via a stereological approach. The secondary dendrite arm spacing is observed to increase throughout the whole solidification range. A novel stereological relation, the modulus of primary dendrite, has been implemented on the calculation of the primary austenite surface. The size scale of the interdendritic phase has been determined by the hydraulic diameter of the interdendritic phase. The linear relations between secondary arm spacing and eutectic cells size and between secondary arm spacing and solidification time have been found to exist during solidification independently of cooling rate. The cooling rate dependence of the secondary dendrite arm spacing and the eutectic cells size is confirmed.

  • 7.
    Olofsson, Jakob
    et al.
    Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing – Casting.
    Larsson, Dan
    Vestascastings Guldsmedshyttan AB.
    Svensson, Ingvar L.
    Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing – Casting.
    Effect of Austempering on Plastic Behavior of Some Austempered Ductile Iron Alloys2011In: Metallurgical and Materials Transactions. A, ISSN 1073-5623, E-ISSN 1543-1940, Vol. 42, no 13, p. 3999-4007Article in journal (Refereed)
    Abstract [en]

    A numerical description relating microstructure to elastic and plastic deformation behavior would make it possible to simulate the mechanical behavior of complex cast components with tailored material properties. Limited work and data have however been published regarding the connection between microstructure and plastic behavior of austempered ductile irons (ADI). In the current work the effects of austempering temperature and austempering time on the strength coefficient and the strain hardening exponent of the Hollomon equation have been investigated for two ADI alloys. The results show that the plastic behavior is highly dependent on the combination of austempering temperature and austempering time. It was found that as the austempering temperature increases both the strength coefficient and the strain hardening exponent initially decrease, but after reaching a minimum at the critical austempering temperature they show a plateau or an increase. The effect of the austempering time on the plastic behavior depends on the austempering temperature. At low austempering temperatures the strength coefficient and the strain hardening exponent decrease with increased austempering time, whereas at higher austempering temperatures they show little time dependence. These relations are explained by the microstructural transformations that take place during the austempering heat treatment.

  • 8.
    Payandeh, Mostafa
    et al.
    Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing – Casting.
    Jarfors, Anders E. W.
    Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing – Casting.
    Wessén, Magnus
    Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing – Casting.
    Solidification sequence and evolution of microstructure during rheocasting of four Al-Si-Mg-Fe alloys with Low Si content2016In: Metallurgical and Materials Transactions. A, ISSN 1073-5623, E-ISSN 1543-1940, Vol. 47, no 3, p. 1215-1228Article in journal (Refereed)
    Abstract [en]

    Four Al-Si-Mg-Fe alloys with Si contents varying from 1.6 to 4.5 wt pct were rheocast, using the RheoMetal™ process to prepare slurry and cast in a vertical high-pressure die casting machine. Particle size and Si concentration in the α-Al particles in the slurry and in the as-rheocast component were investigated. A uniform distribution of Si in the globular α 1-Al particles was achieved in the slurry. In the rheocast samples, measurement of the α 1-Al particles showed that these particles did not increase significantly in size during pouring and secondary solidification. The two additional α-Al particles types, α 2-Al particles and α 3-Al particles, were identified as being a result of two discrete nucleation events taking place after slurry production. The Si concentration in the α 2-Al and α 3-Al particles indicated that the larger α 2-Al particles precipitated before the α 3-Al particles. In addition, in the as-rheocast condition, the Si distribution inside the α 1-Al particles showed three distinct zones; an unaffected zone, a transition zone, and in some cases the start of a dendritic/cellular zone. The phenomenon of dendritic growth of globular α 1-Al particles during secondary solidification occurred concomitantly with the final eutectic reaction and increased with increasing amount of the Al-Si eutectic phase.

  • 9.
    Santos, Jorge
    et al.
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing.
    Jarfors, Anders E.W.
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing.
    Dahle, Arne
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing.
    Formation of Iron-Rich Intermetallic Phases in Al-7Si-Mg: Influence of Cooling Rate and Strontium Modification2019In: Metallurgical and Materials Transactions. A, ISSN 1073-5623, E-ISSN 1543-1940, Vol. 50, no 9, p. 4148-4165Article in journal (Refereed)
    Abstract [en]

    The influence of cooling rate on the formation of iron-rich intermetallic phases during solidification of unmodified and strontium-modified Al-7Si-0.3Mg alloys has been investigated. The effect of strontium on the intermetallic phases was evaluated in unquenched and quenched samples. Samples were quenched before the start of the Al-Si eutectic reaction, along the Al-Si eutectic reaction and just after the end of solidification. The results show that the addition of strontium increased the size of both β-Al5FeSi and π-Al8FeMg3Si6 at low cooling rates. For unmodified and strontium-modified alloys, an increase of cooling rate resulted in a decrease in size of the intermetallic phases, particularly in the strontium modified alloy. In the strontium modified alloy quenched before the start of the Al-Si eutectic reaction, π-Al8FeMg3Si6 appeared as thin platelets at the eutectic cell boundaries. Chinese script-like π-Al8FeMg3Si6 and platelet-like β-Al5FeSi intermetallic phases were observed uniformly distributed in the eutectic regions in the unmodified alloy quenched before the start of the eutectic reaction. Strontium modified semi-solid Al-7Si-0.3Mg castings were produced and the type of intermetallic phase, morphology, size, area fraction and distribution were similar to that observed in the strontium modified alloy quenched before the start of the Al-Si eutectic reaction.

  • 10.
    Santos, Jorge
    et al.
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing.
    Kallien, Lothar H.
    Department of Applied Sciences, Aalen University, Aalen, Germany.
    Jarfors, Anders E.W.
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing.
    Dahle, Arne
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing.
    Influence of grain refinement on slurry formation and surface segregation in semi-solid Al-7Si-0.3Mg castings2018In: Metallurgical and Materials Transactions. A, ISSN 1073-5623, E-ISSN 1543-1940, Vol. 49A, no 10, p. 4871-4883Article in journal (Refereed)
    Abstract [en]

    This study aims to evaluate the effect of grain refinement on slurry formation and surface segregation in semi-solid castings produced by the Rheometal™ process. The effect of two grain refiners, Al-8B and Al-5Ti-1B, on the slurry α-Al grain size, shape factor and solid fraction was evaluated. The results suggest that the addition of a grain refiner can affect the solid fraction obtained in the RheometalTM process and, consequently, reduce the solute content near the casting surface. Grain refiner addition resulted in a larger fraction of α-Al grains ≤ 60 µm for the refined alloys compared with the unrefined alloy. Additionally, the growth of α-Al slurry globules was greater for the unrefined alloy compared with the refined alloy during solidification in the die-cavity. A more homogeneous and finer microstructure was observed near the surface in the grain-refined castings compared with the unrefined castings. Evidence of significant liquid penetration was identified in some α-Al globules, indicating that disintegration of α-Al globules may occur during the Rheometal™ casting process.

  • 11.
    Selin, Martin
    Jönköping University, School of Engineering, JTH. Research area Materials and Manufacturing - Casting. Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Comparing Three Equations Used for Modeling the Tensile Flow Behavior of Compacted Graphite Cast Irons at Elevated Temperatures2010In: Metallurgical and Materials Transactions. A, ISSN 1073-5623, E-ISSN 1543-1940, Vol. 41, no 11, p. 2805-2815Article in journal (Refereed)
    Abstract [en]

    A comparison between three constituent relationships used to approximate the plastic part of a tensile test curve, was performed on compacted graphite cast iron (CGI) samples at temperatures between room temperature and 600{degree sign}C. The investigated relationships were Hollomon, Ludwigson and Voce equations, where Ludwigson equation adjusts Hollomon equation by adding a correction term. The investigated CGI materials were alloyed with four different amounts of molybdenum and each chemical composition was cast with three different solidification rates. The coefficients in the equations generally were quite temperature independent between room temperature and 300{degree sign}C, but changed much in value as the temperature was further increased. Compared to Hollomon and Ludwigson equation, the coefficients in Voce equation directly showed correlation between proof stress at 0.1 % strain and ultimate tensile strength. Another difference between Voce equation and the other two equations is that Voce is not intended to give an accurate description of the stress values at small plastic strain values. The overall best approximation of the stress values was made by Ludwigson equation, followed by Hollomon and last Voce equation. The downside with Ludwigson equation was that its correction term could either be positive or negative, depending on the total plastic strain and the value of coefficients in Hollomon equation. This makes it harder to use as a general equation to approximate stress values compared to Hollomon and Voce equations.

  • 12.
    Selin, Martin
    Jönköping University, School of Engineering, JTH. Research area Materials and Manufacturing - Casting. Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Tensile and Thermal Properties in Compacted Graphite Irons at Elevated Temperatures2010In: Metallurgical and Materials Transactions. A, ISSN 1073-5623, E-ISSN 1543-1940, Vol. 41, no 12, p. 3100-3109Article in journal (Refereed)
    Abstract [en]

    Tensile and thermal properties of compacted graphite irons, or CGI, prepared with various molybdenum additions and solidification rates have been investigated for temperatures between room temperature and 873 K (600{degree sign}C). A slower solidification rate resulted in larger and fewer graphite particles as well as in an increase of intercellular cementite, or carbides. Molybdenum is a carbide stabilizing element, i.e. increasing additions of molybdenum increased the amount of carbides. Young's modulus decreased with increasing temperature and a lower solidification rate increased this parameter slightly. Both increasing content of carbide and increasing nodularity increased the Young's modulus. Strength parameters like yield strength and ultimate tensile strength was affected in similar ways by temperature and solidification rate. The strength values were generally quite temperature independent for temperatures below 573 K (300{degree sign}C) but decreased rapidly for higher temperatures. Increasing nodularity increased the strength while increasing content of carbide had little influence on the values. The thermal conductivity decreased with increasing content of carbide and increasing nodularity. The thermal conductivity generally showed a maximum value at 573 K (300{degree sign}C). A contradictory linear relationship was found between yield strength and thermal conductivity.

  • 13.
    Selin, Martin
    et al.
    Jönköping University, School of Engineering, JTH. Research area Materials and Manufacturing - Casting. Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    König, Mathias
    Jönköping University, School of Engineering, JTH. Research area Materials and Manufacturing - Casting. Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Regression Analysis of Thermal Conductivity Based on Measurements of Compacted Graphite Irons2009In: Metallurgical and Materials Transactions. A, ISSN 1073-5623, E-ISSN 1543-1940, Vol. 40, no 13, p. 3235-3244Article in journal (Refereed)
    Abstract [en]

    A model describing the thermal conductivity of compacted graphite iron (CGI) was created based on the microstructure analysis and thermal conductivity measurements of 76 compacted graphite samples. The thermal conductivity was measured using a laser flash apparatus for seven temperatures ranging between 35 C and 600 C. The model was created by solving a linear regression model taking into account the influence of carbon and silicon additions, nodularity, and fractions of ferrite and carbide constituents. Observations and the results from the model indicated a positive influence of the fraction of ferrite in the metal matrix on the thermal conductivity. Increasing the amount of carbon addition while keeping the CE value constant, i.e., at the same time reducing the silicon addition, had a positive effect on the thermal conductivity value. Nodularity is known to reduce the thermal conductivity and this was also confirmed. The fraction of carbides was low in the samples, making their influence slight.  A comparison of the thermal conductivity values calculated from the model with measured values showed a good agreement, even on materials not used to solve the linear regression model.

  • 14.
    Sjögren, Torsten
    et al.
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Svensson, Ingvar L.
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    The effect of graphite fraction and morphology on the plastic deformation behavior of cast irons2007In: Metallurgical and Materials Transactions. A, ISSN 1073-5623, E-ISSN 1543-1940, Vol. 38, no 4, p. 840-847Article in journal (Refereed)
  • 15.
    Sjölander, Emma
    et al.
    Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing – Casting.
    Seifeddine, Salem
    Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing – Casting.
    Optimization of solution treatment of cast Al-7Si-0.3Mg and Al-8Si-3Cu-0.5Mg alloys2014In: Metallurgical and Materials Transactions. A, ISSN 1073-5623, E-ISSN 1543-1940, Vol. 45, no 4, p. 1916-1927Article in journal (Refereed)
    Abstract [en]

    The influence of solidification rate on the solution-treatment response has been investigated for an Al-7Si-0.3Mg alloy and an Al-8Si-3Cu-0.5Mg alloy. The concentrations of Mg, Cu, and Si in the matrix after different solution-treatment times were measured using a wavelength dispersive spectrometer. All Mg dissolves into the matrix for the Al-Si-Mg alloy when solution treated at 803 K (530 C) because the π-Fe phase is unstable and transforms into short β-Fe plates which release Mg. The Q-Al5Mg8Cu2Si6 phase do not dissolve completely at 768 K (495 C) in the Al-Si-Cu-Mg alloy and the concentration in the matrix reached 0.22 to 0.25 wt pct Mg. The distance between π-Fe phases and Al2Cu phases was found to determine the solution-treatment time needed for dissolution and homogenization for the Al-Si-Mg alloy and Al-Si-Cu-Mg alloy, respectively. From the distance between the phases, a dimensionless diffusion time was calculated which can be used to estimate the solution-treatment times needed for different coarsenesses of the microstructure. A model was developed to describe the dissolution and homogenization processes.

  • 16.
    Wessén, Magnus
    et al.
    Jönköping University, School of Engineering, JTH. Research area Materials and Manufacturing - Casting. Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Svensson, Ingvar L
    Jönköping University, School of Engineering, JTH. Research area Materials and Manufacturing - Casting. Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Modeling of ferrite growth in nodular cast iron1996In: Metallurgical and Materials Transactions. A, ISSN 1073-5623, E-ISSN 1543-1940, Vol. 27, no 8, p. 2209-2220Article in journal (Refereed)
1 - 16 of 16
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