Crack growth behavior of 9Cr-1Mo (P91) steel under creep-fatigue conditions

被引：76

作者：

Narasimhachary, S. B. ^{[1
]}

Saxena, A. ^{[1
,2
]}

机构：

[1] Univ Arkansas, Dept Mech Engn, Fayetteville, AR 72701 USA

[2] Galgotias Univ, Greater Noida, UP, India

来源：

INTERNATIONAL JOURNAL OF FATIGUE | 2013年 / 56卷

关键词：

Creep-fatigue; Crack growth; P91; steel; (C-t)(avg) parameter; MARTENSITIC STEEL;

D O I：

10.1016/j.ijfatigue.2013.07.006

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

Several components operated at high temperature are also subjected to cyclic loading making crack growth behavior under creep-fatigue conditions a significant concern during design and during service. This is especially the case for components designed for long term service. Creep-fatigue crack growth tests were conducted on a modified 9Cr-1Mo (P91) steel at 625 degrees C under constant load amplitude conditions with various hold times using compact type specimens. The crack growth rates per cycle increased significantly with increase in hold time when crack growth data were plotted with the cyclic stress intensity factor, AK. It is shown that the creep-fatigue interactions during crack growth for various hold times are represented better by the (C)(avg) parameter implying that the P91 steel behaves in a creepductile manner. The test results are also used for assessing the newly developed American Society for Testing and Materials (ASTM) test standard, E2760-10 for creep-fatigue testing. (C) 2013 Elsevier Ltd. All rights reserved.

引用

页码：106 / 113

页数：8

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