Assurring microstructural homogeniety in dual phase and trip steels

Rivera-Díaz-Del-Castillo, P. E.J. and Van Der Zwaag, S. (2004) Assurring microstructural homogeniety in dual phase and trip steels. In: Multiscaling in Applied Science and Emerging Technology; Fundamentals and Applications in Mesomechanics. UNSPECIFIED, GRC, pp. 261-265. ISBN 960881040X

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The presence of ferrite/pearlite bands in dual phase and TRIP assisted steels is a consequence of micro-chemical segregation which causes mechanical properties anisotropy. Such inhomogeneous phase distribution produces a lowering of the mechanical properties such as fracture behaviour. This anisotropy is commoly not accounted in micromechanics computation which often assume a random distribution of phases in the solid. The present paper deals with an integral model for this undesirable band formation accounting for the solute segregation caused by solidification, microcomponent diffusion present in the austenitisation process, and the nucleation of the transformed phase in segregated regions. In the present work, the model was applied to two industrial grade dual phase steels and two TRIP assisted steels. The influence of such parameters on band formation is summarised in a number of "band prevention plots", which are aimed at providing the optimum processing conditions for ferrite/pearlite band prevention.

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24 May 2018 13:20
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21 Sep 2023 03:54