Research on representative stress and fracture ductility of P92 steel under multiaxial creep

被引：25
|
作者：
Chang, Yuan [1 ]
Xu, Hong [1 ]
Ni, Yongzhong [1 ]
Lan, Xiang [1 ]
Li, Hongyuan [1 ]
机构：
[1] North China Elect Power Univ, Minist Educ, Key Lab Condit Monitoring & Control Power Plant E, Beijing 102206, Peoples R China
来源：
ENGINEERING FAILURE ANALYSIS | 2016年 / 59卷
基金：
中国国家自然科学基金;
关键词：
P92; steel; Representative stress; Fracture ductility; Multiaxial creep; Prediction model; FINITE-ELEMENT-ANALYSIS; POWER-LAW CREEP; INTERGRANULAR FRACTURE; RUPTURE BEHAVIOR; FAILURE; GROWTH; STATE; VOIDS; BARS;
D O I：
10.1016/j.engfailanal.2015.09.011
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
Creep experiments on both plain and notched specimens were conducted at 650 degrees C over a stress range of 120-185MPa. The notch strengthening effect was found to exhibit in notched specimens. By using stress components at the skeletal point, several expressions of representative stress were compared to validate their effectiveness in predicting creep rupture lives of P92 steel under multiaxial stress states. The results showed that Hayhurst representative stress was more suitable for life predictions of P92 steel. In the mean time, the relationship between the fracture ductility and multiaxiality was presented to investigate the influence of the multiaxial stress states on creep rupture behavior of P92 steel. A more reasonable prediction model was proposed, and the validity of the model was verified by experimental data. (C) 2015 Elsevier Ltd. All rights reserved.
引用
收藏
页码：140 / 150
页数：11
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