Review of Z phase precipitation in 9-12 wt-%Cr steels

被引：67

作者：

Danielsen, H. K. ^{[1
]}

机构：

[1] Tech Univ Denmark, Dept Wind Energy, Mat Sci & Characterisat, Frederiksborgvej 399,B228, DK-4000 Roskilde, Denmark

来源：

MATERIALS SCIENCE AND TECHNOLOGY | 2016年 / 32卷 / 02期

关键词：

Z phase; MX; 9-12Cr steels; Precipitates; HHh temperature steels; TERM CREEP DEFORMATION; POWER-PLANT; CRYSTAL-STRUCTURE; FERRITIC STEELS; STABILITY; NITRIDES; STRENGTH; MICROSTRUCTURE; DEGRADATION; NUCLEATION;

D O I：

10.1179/1743284715Y.0000000066

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

For high temperature applications, 9-12 wt-%Cr steels in fossil fired power plants rely upon precipitate strengthening from (V, Nb) N MX nitrides for long term creep strength. During prolonged exposure at service temperature, another nitride precipitates: Cr(V, Nb) NZ phase. The Z phases lowly replace MX, eventually causing a breakdown in creep strength. The present paper reviews the Z phase and its behaviour in 9-12 wt-% Cr steels including thermodynamic modelling, crystal structure, nucleation process and precipitation rate as a function of chemical composition. The influence of Z phase precipitation upon long term creep strength is assessed from several different 9-12wt-%Cr steel grades and alloy design philosophies.

引用

页码：126 / 137

页数：12

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