On the prediction of martensite formation in metals

SCRIPTA MATERIALIA

卷:138

Article

Galindo-Nava, E. I.¹ 

[1] Univ Cambridge, Dept Mat Sci & Met, 27 Charles Babbage Rd, Cambridge CB3 0FS, England

关键词: Martensitic phase transformation;    Martensitic steels;    Shape memory alloys;    Titanium alloys;    CALPHAD;   

DOI  :  10.1016/j.scriptamat.2017.05.026

来源: Elsevier

【 摘 要 】

A new approach to predict athermal martensite formation in metals is presented. It is based on computing the driving force of the transformation including a strain energy term induced by atomic shear displacements and energy terms due to substitutional and interstitial lattice distortions. The model is applied to prescribe the martensite and austenite start temperatures in Fe-, Ti- and Co-based alloys with no adjustable parameters. Expressions for M-s variations with composition are derived for multicomponent systems. The transformation temperature hysteresis is predicted in Co alloys showing that this approximation can be used to design alloys with the shape memory effect. (C) 2017 Published by Elsevier Ltd on behalf of Acta Materialia Inc.

【 授权许可】

Free