Carbide precipitation in austenitic stainless steel carburized at low temperature

被引：95

作者：

Ernst, F. ^{[1
]}

Cao, Y. ^{[1
]}

Michal, G. M. ^{[1
]}

Heuer, A. H. ^{[1
]}

机构：

[1] Case Western Reserve Univ, Dept Mat Sci & Engn, Cleveland, OH 44106 USA

来源：

ACTA MATERIALIA | 2007年 / 55卷 / 06期

关键词：

austenitic stainless steel; Fe-Cr-Ni; surface alloying; low-temperature gas-phase carburization; lambda-carbide; (M5C2; Hagg);

D O I：

10.1016/j.actamat.2006.09.049

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Low-temperature gas-phase carburization can significantly improve the surface mechanical properties and corrosion resistance of austenitic stainless steel by generating a single-phase "case" with concentrations of interstitially dissolved carbon exceeding the equilibrium solubility limit by orders of magnitude. Upon prolonged treatment, however, carbides (mostly chi, M5C2) can precipitate and degrade the properties. High-resolution and spatially resolved analytical transmission electron microscopy revealed the precise carbide-austenite orientation relationship, a highly coherent interface, and that precipitation only occurs when (i) the carbon-induced lattice expansion of the austenite has reached a level that substantially reduces volume-misfit stress and (ii) diffusional transport of nickel, chromium, and iron - enhanced by structural defects - can locally reduce the nickel concentration to the solubility limit of nickel in chi-carbide. (c) 2006 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：1895 / 1906

页数：12

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