4.7 Article

A new ultrahigh-strength stainless steel strengthened by various coexisting nanoprecipitates

Journal

ACTA MATERIALIA
Volume 58, Issue 11, Pages 4067-4075

Publisher

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2010.03.005

Keywords

Maraging steels; Stainless steels; Thermodynamics; Precipitation; Alloy design

Funding

  1. Ghent University, Belgium
  2. [MC5.04192]

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A general computational alloy design approach based on thermodynamic and physical metallurgical principles and coupled with a genetic optimization scheme is presented. The model is applied to develop a new ultrahigh-strength maraging stainless steel. The alloy composition and heat treatment parameters are integrally optimized so as to achieve microstructures of fully lath martensite matrix strengthened by multiple precipitates of MC carbides, Cu particles and Ni3Ti intermetallics. The combined mechanical properties, corrosion resistance and identification of actual strengthening precipitates in the experimental prototype produced on the basic of the model predictions provide a strong justification for the alloy design approach. (C) 2010 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

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