Mechanical derivation of elastic constants of ε-martensite

SCRIPTA MATERIALIA

卷:169

Article

Richeton, Thiebaud¹ 

[1] Univ Lorraine, CNRS, Arts & Metiers ParisTech, LEM3, F-57000 Metz, France

关键词: Martensitic phase transformation;    Elastic behavior;    Micromechanical modeling;    Austenitic steels;    Anisotropic elasticity;   

DOI  :  10.1016/j.scriptamat.2019.04.042

来源: Elsevier

【 摘 要 】

This work presents direct formulas to compute the HCP elastic constants of epsilon-martensite from the FCC ones of austenite. The derivation is performed thanks to mechanical compatibility arguments while considering epsilon-martensite as a laminate structure of twinned and untwinned FCC phases. The formulas are applied to predict the elastic constants of several alloys and very good agreement with measurements is found. According to these relations, directional Young moduli of epsilon-martensite are most of the time stiffer than the austenite ones and the (0001) shear modulus is always greater than the (111) one, which hardens dislocation glide parallel to the interfaces. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

【 授权许可】

Free