4.6 Article

Ageing Hardening Mechanism and Corrosion Resistance in the Fe65Cr13Cu3(CoMnMoNiAlTi)19 Medium-Entropy Stainless Alloy

期刊

ACTA METALLURGICA SINICA-ENGLISH LETTERS
卷 34, 期 11, 页码 1601-1608

出版社

CHINESE ACAD SCIENCES, INST METAL RESEARCH
DOI: 10.1007/s40195-021-01288-0

关键词

Medium-entropy stainless alloy; Ordered phase transition; Aging hardening; Corrosion resistance

资金

  1. National Natural Science Foundation of China [51971001, 52005007, U1560105]
  2. Natural Science Foundation of Anhui Province [2008085ME125]

向作者/读者索取更多资源

The newly designed Fe-Cr-based medium-entropy stainless alloy exhibits high ageing hardness, compressive stress, and corrosion resistance compared to conventional precipitation hardening stainless steel. The transformation of the well-dispersed B2-ordered phase to a D0(3) crystal structure after ageing at 500 degrees Celsius results in a significant ageing hardening effect.
The ageing hardening mechanism of a newly designed Fe-Cr-based Fe65Cr13Cu3(CoMnMoNiAlTi)(19) medium-entropy stainless alloy (ME-SA) with a simple bcc solid solution matrix was studied. This kind of ME-SA possessed a higher ageing hardness of approximately 584 HV and higher compressive stress and corrosion resistance than those of the conventional precipitation hardening stainless steel 17-4PH (Cr17Ni4Cu4Nb), which has comparable compressive strain. The well-dispersed B2-ordered phase in the cast state transformed to a D0(3) crystal structure with a higher ordering degree and reduced the precipitate size after ageing at 500 degrees C, thus promoting a great ageing hardening effect.

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