Microstructure and long-term creep properties of 9-12% Cr steels

被引：370

作者：

Hald, J. ^{[1
]}

机构：

[1] Tech Univ Denmark, IPL MPT, Energy 2, Elsam, Lyngby, Denmark

来源：

INTERNATIONAL JOURNAL OF PRESSURE VESSELS AND PIPING | 2008年 / 85卷 / 1-2期

关键词：

9-12% Cr steels; long-term creep stability; creep mechanisms; precipitate characterisation; precipitate stability modelling; laves phase; MX nitrides; Z-phase;

D O I：

10.1016/j.ijpvp.2007.06.010

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Advanced microstructure characterisation and microstructure modelling has demonstrated that long-term microstructure stability in 9-12% Cr steels under technical loading conditions is equivalent to precipitate stability. Mo and W can have a positive influence on long-term creep strength of 9-12% Cr steels by Laves phase precipitation hardening. Unexpected breakdown of long-term creep stability of a number of alloys is caused by precipitation of the complex Z-phase nitride, which may completely dissolve fine V and Nb containing NIX nitrides. High Cr contents of 10% and above in the steels accelerate Z-phase precipitation. (c) 2007 Elsevier Ltd. All rights reserved.

引用

页码：30 / 37

页数：8

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