Elevated temperature intergranular cracking in heat-resistant steels

被引：27

作者：

Heo, N. H. ^{[1
]}

Chang, J. C. ^{[2
]}

Kim, S. -J. ^{[1
]}

机构：

[1] POSTECH, Grad Inst Ferrous Technol, Pohang 790738, Gyungbuk, South Korea

[2] KEPCO Res Inst, Taejon 305380, South Korea

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2013年 / 559卷

关键词：

Post-weld heat treatment; Thermal tensile stress; Grain boundary segregation; High temperature cracking; Intergranular failure; GRAIN-BOUNDARY SEGREGATION; STRESS RELIEF CRACKING; APPLIED TENSILE-STRESS; LOW-ALLOY STEEL; BRITTLE-DUCTILE TRANSITION; NONEQUILIBRIUM SEGREGATION; INTERFACIAL SEGREGATION; PHOSPHORUS SEGREGATION; EMBRITTLEMENT; KINETICS;

D O I：

10.1016/j.msea.2012.09.007

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

It is confirmed that the time to intergranular failure t under tensile stress in heat-resistant steels can be expressed by t(0)sigma(-n)exp(Q/RT) where n is the stress exponent, Q the activation energy, and t(0) the proportional constant. It is also confirmed that, because the phosphorus segregation concentration is markedly higher at grain boundary/carbide interfaces than carbide-free grain boundary areas, the cracks initiate at the grain boundary/carbide interfaces and then propagate along the intergranular path. On the basis of the dependence of yield, grain boundary/carbide interface and carbide-free grain boundary area strengths on temperature, the intergranular stress relief or premature cracking occurring in the heat-affected zone and/or the weld metal is elucidated in detail, and the major factors for the intergranular cracking are clarified. (C) 2012 Elsevier B.V. All rights reserved.

引用

页码：665 / 677

页数：13

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