Assuring microstructural homegeniety in dual phase and trip steels

Rivera-Díaz-Del-Castillo, P. E.J. and Van Der Zwaag, S. (2004) Assuring microstructural homegeniety in dual phase and trip steels. Steel Research International, 75 (11). pp. 711-715. ISSN 1611-3683

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The presence of ferrite/pearlite bands in dual phase and TRIP assisted steels is a consequence of microchemical segregation which causes mechanical properties anisotropy. Such inhomogeneous phase distribution produces a lowering of the mechanical properties such as fracture behaviour. This anisotropy is commonly not accounted in micromechanics computations 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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Steel Research International
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24 May 2018 13:40
Last Modified:
22 Nov 2022 05:54