Deformation-mechanism-based modeling of creep behavior of modified 9Cr-lMo steel

被引：32
作者：
Zhang, X. Z. [1 ]
Wu, X. J. [2 ]
Liu, R. [1 ]
Liu, J. [1 ]
Yao, M. X. [3 ]
机构：
[1] Carleton Univ, Dept Mech & Aerosp Engn, Ottawa, ON K1S 5B6, Canada
[2] Natl Res Council Canada, Inst Aerosp Res, Struct & Mat Performance Lab, Ottawa, ON K1A 0R6, Canada
[3] Kennamet Stellite, Belleville, ON K8N 1G2, Canada
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2017年 / 689卷
基金：
加拿大自然科学与工程研究理事会;
关键词：
Deformation-mechanism-based model; Modified 9Cr-lMo steel; Creep; Heat treatment; Thermomechanical processing; MARTENSITIC STEEL; RUPTURE;
D O I：
10.1016/j.msea.2017.02.044
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
A deformation-mechanism-based true-stress creep model is proposed for studying the creep behavior of modified 9Cr-lMo steel in this research. Constant-load creep test is conducted on modified 9Cr-lMo steel in forged form (F91). The creep data obtained in the present study and those reported from the National Institute for Materials Science (NIMS, Japan) on modified 9Cr-lMo steels processed by different means are analyzed. It is revealed that the relationship of minimum creep rate versus applied engineering stress exhibits distinct power exponent n in three stress regions, which are associated with different deformation mechanisms. The proposed model considers three well recognized deformation mechanisms: dislocation glide, dislocation climb, and grain boundary sliding. The analyses of the experimental data show that this deformation-mechanism-based model can describe fairly well the entire creep deformation process consisting of primary, steady-state, and tertiary creep.
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页码：345 / 352
页数：8
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