J. Mater. Sci. Technol. ›› 2022, Vol. 112: 291-300.DOI: 10.1016/j.jmst.2021.09.060

• Research Article • Previous Articles     Next Articles

Thermodynamic prediction of martensitic transformation temperature in Fe-C-X (X=Ni, Mn, Si, Cr) systems with dilatational coefficient model

Hongcan Chena, Wei Xub, Qun Luoa,*(), Qian Lia,c,*(), Yu Zhangd, Jingjing Wangd, Kuo-Chih Choua   

  1. aState Key Laboratory of Advanced Special Steel & Shanghai Key Laboratory of Advanced Ferrometallurgy & School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China
    bState Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, China
    cNational Engineering Research Center for Magnesium Alloy, Chongqing University, Chongqing 400044, China
    dAnsteel Beijing Research Institute Co., Ltd, Beijing 102211, China
  • Received:2021-07-01 Revised:2021-09-06 Accepted:2021-09-24 Published:2021-12-26 Online:2021-12-26
  • Contact: Qun Luo,Qian Li
  • About author:shuliqian@shu.edu.cn (Q. Li).
    * E-mail addresses: qunluo@shu.edu.cn (Q. Luo),

Abstract:

Martensitic transformation is significant to strengthen steels, but its thermodynamic prediction is restricted to simple systems due to lacking multicomponent interaction parameters. The driving forces of martensitic transformation can be divided into chemical and non-chemical driving forces. The magnetic parameters are carefully optimized because it affects the magnetic Gibbs free energy of austenite and ferrite, and have big impact on the chemical driving force. The dilatational strain energy provides major contribution to non-chemical driving force, thus the integrated-models for dilatational coefficient are constructed in a wide composition and temperature range based on the experimental dilatational data. It expands the scope of application of thermodynamic model and improved prediction accuracy of martensitic transformation temperature (Ms). The prediction error reaches 5.6% for Fe-C-X (X=Ni, Mn, Si, Cr) and 6.5% for Fe-C-Mn-Si-X (X=Cr, Ni) steels.

Key words: Martensitic transformation, Thermodynamics, Dilatational strain energy, Linear expansion coefficient, Fe-C-X (X=Ni, Mn, Si, Cr) system