Remaining life assessment of a CrMoV steel using the Z-parameter method

被引：31
|
作者：
Zhao, J [1 ]
Han, SQ [1 ]
Gao, HB [1 ]
Wang, L [1 ]
机构：
[1] Dalian Univ Technol, Dept Mat Engn, Dalian 116024, Peoples R China
来源：
INTERNATIONAL JOURNAL OF PRESSURE VESSELS AND PIPING | 2004年 / 81卷 / 09期
关键词：
life assessment; steel; spheroidization; carbides; creep rupture;
D O I：
10.1016/j.ijpvp.2004.05.002
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
A Z-parameter method based on the Larson-Miller relationship is proposed to assess the remaining life of a CrMoV steel. It is found that the non-linear master curve of stress sigma vs Larson-Miller parameter P of the steel can be expressed as: P = 26.68 - 2.49 log sigma - 0.01sigma. A family of curves parallel to the master curve can be expressed as: P = Z - 2.49 log sigma - 0.01sigma, where the value of Z represents the deviation from the master curve which corresponds with the deterioration in rupture-properties. The deterioration in rupture properties is connected with the degradation of microstructure, namely the spheroidization of carbides in the pearlitic steel. A relationship between the value of the Z-parameter and the level of spheroidization E can be expressed as: Z = 27.32 - 0.54E. A normal distribution is supported for the value of the Z-parameter by both normal probability plotting paper and Shapiro-Wilk normality tests. (C) 2004 Elsevier Ltd. All rights reserved.
引用
收藏
页码：757 / 760
页数：4
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