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  • 1.
    Diaconu, Lucian Vasile
    et al.
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Material och tillverkning – Gjutning.
    Sjögren, Torsten
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Material och tillverkning – Gjutning.
    Skoglund, Peter
    Scania CV AB.
    Diószegi, Attila
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Material och tillverkning – Gjutning.
    A molibdén hatása az öntöttvasak termomechanikus hőfárasztási tulajdonságaira.2013Inngår i: Banyaszati es Kohaszati Lapok - Kohaszat, ISSN 0005-5670, Vol. 146, nr 1, s. 13-17Artikkel i tidsskrift (Fagfellevurdert)
  • 2.
    Diaconu, Lucian Vasile
    et al.
    Department of Metallurgical and Foundry Engineering, University of Miskolc, Hungary.
    Sjögren, Torsten
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Material och tillverkning – Gjutning.
    Skoglund, Peter
    SCANIA CV AB Materials Technology, Södertälje, Sweden.
    Diószegi, Attila
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Material och tillverkning – Gjutning.
    Influence of molybdenum alloying on thermomechanical fatigue life of compacted graphite irons2012Inngår i: International Journal of Cast Metals Research, ISSN 1364-0461, E-ISSN 1743-1336, Vol. 25, nr 5, s. 277-286Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    In this study four compacted graphite irons (CGIs) and one grey cast iron (FGI) were produced and tested in the laboratory. The molybdenum content of the four CGI grades was varied between 0 and 1··01 wt-%. The purpose of the investigations was to examine the effect of the different molybdenum contents of the CGI on the thermomechanical fatigue (TMF) behaviour. The TMF tests were performed by cycling a constrained specimen between 110 and 600°C. For every material three tests were performed on specimens machined from a ∅20 mm cylinder. Other tests were performed on specimens machined from ∅55 mm and ∅85 mm cylinders respectively. The tests showed that additions of molybdenum improved the fatigue resistance of CGI. It was observed that additions of molybdenum refined the pearlite and that the specimens with a finer metallic matrix had a higher TMF resistance.

  • 3.
    Diaconu, Lucian Vasile
    et al.
    University of Miskolc, Hungary.
    Sjögren, Torsten
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Material och tillverkning – Gjutning.
    Skoglund, Peter
    Scania CV AB.
    Diószegi, Attila
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Material och tillverkning – Gjutning.
    Stress relaxation of compacted graphite iron alloyed with molybdenum2013Inngår i: International Journal of Cast Metals Research, ISSN 1364-0461, E-ISSN 1743-1336, Vol. 26, nr 1, s. 51-57Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    In a previous study, the thermomechanical fatigue resistance of four compacted graphite irons (CGIs) and one grey cast iron was investigated. The molybdenum content of the four CGIs varied between 0 and 1.01 wt-%. It was observed that during thermal cycling, the maximum value of the compressive stress continuously decreased while the value of the maximum tensile stress continuously increased. The continuous decrease in compressive stresses showed that stress relaxation occurs at elevated temperatures during thermal cycling. The goal of the present investigation was to investigate the phenomenon of stress relaxation at elevated temperatures. The tests were performed at 350 and 600°C respectively. The results of the stress relaxation tests performed at 600°C showed the same trend observed at thermomechanical fatigue testing. The tests showed that additions of molybdenum improved the fatigue resistance of CGI by lowering the stress relaxation rate.

  • 4.
    Diószegi, Attila
    et al.
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Material och tillverkning. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Material och tillverkning – Gjutning.
    Diaconu, Lucian Vasile
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Material och tillverkning – Gjutning. Högskolan i Jönköping, Tekniska Högskolan, JTH, Material och tillverkning.
    Microstructures and Characterization of Gray Irons2017Inngår i: ASM Handbook, Volume 1A: Cast Iron Science and Technology / [ed] Doru M. Stefanescu, Materials Park, Ohio: ASM International, 2017, s. 583-589Kapittel i bok, del av antologi (Fagfellevurdert)
  • 5.
    Diószegi, Attila
    et al.
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Material och tillverkning.
    Diaconu, Lucian VasileHögskolan i Jönköping, Tekniska Högskolan, JTH, Material och tillverkning.Jarfors, Anders E.W.Högskolan i Jönköping, Tekniska Högskolan, JTH, Material och tillverkning.
    Science and Processing of Cast Iron XI2018Konferanseproceedings (Fagfellevurdert)
    Abstract [en]

    The goal of this book is to present for readers the articles from the 11th International Symposium on the Science and Processing of Cast Iron that was held in September 2017 in Jönköping, Sweden. The content of the book reflects the state of the art, research and development tendencies of cast iron as the main engineering cast material also in the 21st century.

  • 6.
    Fourlakidis, Vasilios
    et al.
    Swerea SWECAST AB, Jönköping, Sweden.
    Diaconu, Lucian Vasile
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Material och tillverkning.
    Diószegi, Attila
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Material och tillverkning.
    Strength prediction of lamellar graphite iron: From Griffith’s to hall-petch modified equation2018Inngår i: Materials Science Forum, ISSN 0255-5476, E-ISSN 1662-9752, Vol. 925, s. 272-279Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Traditionally, ultimate tensile strength (UTS) is used as the main property for the characterization of lamellar graphite iron (LGI) alloys under static loads. The main models found in the literature for predicting UTS of pearlitic lamellar graphite iron are based on either regression analysis on experimental data or on modified Griffith or Hall-Petch equation. In pearlitic lamellar graphite iron the primary austenite dendritic network, transformed to pearlite, reinforces the bulk material while the distance between those pearlite grains, defines the maximum continuous defect size in the bulk material. Recently the novel parameter of the Diameter of Interdendritic Space has been used to express the flow length in a modified Griffith equation for the prediction of the UTS in LGI. Nevertheless this model neglects the strengthening effect of the pearlite lamellar spacing within the perlite grains. A model based on modified Hall-Petch equation was developed in this work. The model considers the effect of both microstructure parameters and covers a broad spectrum of microstructure sizes typical for complex shape castings with various wall thicknesses. 

  • 7.
    Hellström, Kristina
    et al.
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Material och tillverkning.
    Svidró, Péter
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Material och tillverkning.
    Diaconu, Lucian Vasile
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Material och tillverkning.
    Diószegi, Attila
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Material och tillverkning.
    Density variations during solidification of grey cast Iron2018Inngår i: Materials Science Forum, ISSN 0255-5476, E-ISSN 1662-9752, s. 155-162Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    As part of moving towards a sustainable production of diesel engines for heavy vehicle applications, the ability to predict casting defects has become ever so important. In order to model the solidification process for cast components correctly, it is of essence to know how the material will actually behave. To produce sound castings, often of complex geometry, the industry relies on various simulation software for the prediction and avoidance of defects. Thermophysical properties, such as density, play an important part in these simulations. Previous measurements of how the volume of liquid grey iron changes with temperature has been made with a conventional dilatometer. Measurements have also been made in the austenitic range, then on iron-carbon-silicon alloys with a carbon content lower than 1.5 wt%. Based on these measurements the density variations during solidification were calculated. The scope for this paper is to model the volume changes during solidification with the control volume finite difference method, using data from the density measurements. 

  • 8.
    Skoglund, Peter
    et al.
    Scania CV AB, Södertälje, Sweden.
    Elfsberg, Jessica
    Scania CV AB, Södertälje, Sweden.
    Ipek, Nulifer
    Scania CV AB, Södertälje, Sweden.
    Diaconu, Lucian Vasile
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Material och tillverkning.
    Larsson, Mari
    Volvo Group Trucks Operations, Skövde, Sweden.
    Schmidt, Pål
    Volvo Group Trucks Technology, Gropegårdsgatan, Göteborg, Sweden.
    Thermo-mechanical fatigue of grey cast iron for cylinder heads - Effect of niobium, molybdenum and solidification time2018Inngår i: Materials Science Forum, ISSN 0255-5476, E-ISSN 1662-9752, Vol. 925, s. 377-384Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Grey iron alloyed with molybdenum and niobium in seven different compositions has been casted using three, in industrial components viable, solidification times which resulted in 21 different samples. The samples have been investigated with respect to microstructure, static properties and thermo-mechanical fatigue performance. It was found that the solidification time is very important for both the static and thermo-mechanical performance. If the solidification time is long the properties are controlled entirely by the large graphite flakes and there is no influence of the alloying elements. On the other hand if the solidification time can be kept short the need for alloying elements may be removed. For the shorter solidification times an influence from the matrix and thus the alloying elements can be seen. It was found that molybdenum enhances TMF-life while no such effect was found for niobium. Niobium, on the other hand, has a larger effect on static strength than molybdenum and also on the cyclic stress in the thermo-mechanical fatigue experiments. 

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