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Dynamic Coarsening of Austenite Dendrite in Lamellar Cast Iron Part 1 – Investigation based on interrupted solidification
Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing – Casting. (Foundry Technology)
Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing – Casting. (Foundry Technology)
Swerea Swecast.
2014 (English)In: Materials Science Forum, ISSN 0255-5476, E-ISSN 1662-9752, Vol. 790-791, p. 205-210Article in journal (Refereed) Published
Abstract [en]

Dynamic coarsening of austenite dendrite in lamellar cast iron has been studied for a hypoeutectic alloy. The common morphological parameter to characterize dynamic coarsening, secondary dendrite arm space has been replaced by the Modulus of primary dendrite (MPD) and the Hydraulic diameter of the interdendritic space (DHydIP) to interpret the dynamic coarsening with respect to the local solidification time. The obtained results demonstrate the coarsening process of both the solid and liquid phase. The interdendritic space is increasing as the contact time between the solid and liquid phase increases. The ratio between the DHydIP/MPD is strongly dependent on the precipitated fraction primary austenite indicating clearly the morphology variation during coarsening. The interrupted solidification method demonstrate that the observed coarsening process is not only a combination of the increasing fraction precipitated solid phase and the rearrangement of the solid - liquid interphase curvature but the volume change due to density variation is also contribute to the coarsening process.

Place, publisher, year, edition, pages
Trans Tech Publications, 2014. Vol. 790-791, p. 205-210
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:hj:diva-25446DOI: 10.4028/www.scientific.net/MSF.790-791.205Scopus ID: 2-s2.0-84901420606OAI: oai:DiVA.org:hj-25446DiVA, id: diva2:774943
Conference
6th International Conference on Solidification and Gravity; Miskolc, Lillafured; Hungary; 2 September 2013 through 5 September 2013
Available from: 2014-12-30 Created: 2014-12-30 Last updated: 2019-03-08Bibliographically approved
In thesis
1. Dendritic morphology and ultimate tensile strength of pearlitic lamellar graphite iron
Open this publication in new window or tab >>Dendritic morphology and ultimate tensile strength of pearlitic lamellar graphite iron
2019 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The continued development, of cylinder blocks and cylinder heads for heavy truck engines that are made of lamellar graphite iron (LGI) is focused on achieving high ultimate tensile strength (UTS) whilst conforming to environmental regulations. The purpose of this work is to further improve the tensile strength as well as the predictive engineering tools for optimization of LGI aimed to enhance the efforts for producing lighter and sustainable components without sacrificing performance.

Varying the carbon content and solidification rate greatly influences the amount and the coarseness of the microstructure phases resulting in large variations of material properties. The experimental data set provided in this work covers a comprehensive range of microstructure and the UTS values aimed to be used in a holistic model for UTS prediction.

In pearlitic LGI the primary austenite dendritic network reinforces the material while the distance between the pearlite grains defines the maximum continuous defect size. The novel parameter of Hydraulic Diameter of the Inter-dendritic Phase (DIPHyd) has been introduced in this work to express the amount and the coarseness of the space between the pearlite grains that have been solidified as primary austenite dendrites. The DIPHyd has proven to be the generic parameter that defines the maximum continuous defect size in the material, and hence it has been applied in modified Griffith and Hall-Petch models for prediction of UTS.

Microstructure models have been developed for prediction of the key microstructure parameters that define the strength of LGI. These models have been combined with the modified Griffith and Hall-Petch equations and incorporated into casting simulation software to enable the strength prediction for pearlitic LGI alloys with various carbon contents. The results show that the developed models can be successfully applied, along with the simulation tools across a wide range of carbon content from eutectic to hypoeutectic composition, for the alloys solidified at various cooling rates typical for both thin and thick walled complex shaped iron castings.

Place, publisher, year, edition, pages
Jönköping: Jönköping University, School of Engineering, 2019. p. 47
Series
JTH Dissertation Series ; 38
Keywords
Lamellar graphite iron, Primary austenite dendrite, Ultimate tensile strength, Microstructure model
National Category
Metallurgy and Metallic Materials
Identifiers
urn:nbn:se:hj:diva-43228 (URN)978-91-87289-40-8 (ISBN)
Public defence
2019-01-16, 10:30 (English)
Opponent
Supervisors
Available from: 2019-03-08 Created: 2019-03-04 Last updated: 2019-03-08Bibliographically approved

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Diószegi, AttilaLora, Ruben

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