材料科学与技术 ›› 2017, Vol. 33 ›› Issue (12): 1577-1581.DOI: 10.1016/j.jmst.2017.05.004

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  • 收稿日期:2016-11-14 修回日期:2016-11-28 接受日期:2016-11-30 出版日期:2017-12-20 发布日期:2018-01-30

Charting the ‘composition-strength’ space for novel austenitic, martensitic and ferritic creep resistant steels

Lu Qiabc, der Zwaag Sybrandvanb, Xu Weiab*()   

  1. aState Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, China
    bNovel Aerospace Materials group, Faculty of Aerospace Engineering, Delft University of Technology, Kluyverweg 1, 2629 HS, Delft, The Netherlands
    cChina Science Laboratory, General Motors Global Research and Development, Shanghai 201206, China
  • Received:2016-11-14 Revised:2016-11-28 Accepted:2016-11-30 Online:2017-12-20 Published:2018-01-30
  • Contact: Xu Wei

Abstract:

We report results of a large computational 'alloy by design' study, in which the ‘chemical composition-mechanical strength’ space is explored for austenitic, ferritic and martensitic creep resistant steels. The approach used allows simultaneously optimization of alloy composition and processing parameters based on the integration of thermodynamic, thermo-kinetics and a genetic algorithm optimization route. The nature of the optimisation depends on both the intended matrix (ferritic, martensitic or austenitic) and the desired precipitation family. The models are validated by analysing reported strengths of existing steels. All newly designed alloys are predicted to outperform existing high end reference grades.

Key words: Alloy design, Precipitation hardening, Coarsening rate, Solid solution strengthening, Matrix