Influence of Laves phase on creep strength of modified 9Cr-1Mo steel

被引：45

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] Kennametal Stellite, Belleville, ON K8N 1G2, Canada

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2017年 / 706卷

基金：

加拿大自然科学与工程研究理事会;

关键词：

Laves phase; Modified 9Cr-1Mo steel; Creep; Deformation-mechanism-based model; Heat treatment; MARTENSITE FERRITIC STEELS; LONG-TERM CREEP; ALLOY DESIGN; MICROSTRUCTURE; RUPTURE;

D O I：

10.1016/j.msea.2017.08.111

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The influence of Laves phase in the microstructure on the creep strength of a modified 9Cr-1Mo tempered ferritic steel, F91, is investigated in this research. Through additional aging heat treatment up to 5000 h, a pronounced increase of Mo-rich Laves phase is found around Cr-rich carbide M23C6, which is pinned on the prior-austenite grain boundaries and martensitic lath boundaries. This secondary precipitation hardening provided by the Laves phase is rapidly offset by its coarsening into large clusters during long-term thermal exposure and under creep conditions, leading to earlier creep rupture than the pristine material. Uniaxial constant-load creep tests are conducted on both aged and non-aged coupons under the same creep conditions. The creep rupture behavior of both materials is rationalized with the assistance of a deformation-mechanism-based true-stress creep model that was developed in the previous work. The effects of Laves phase on the creep strength of F91 are related to its influence on the well-recognized existing deformation mechanisms: dislocation glide, dislocation climb, and grain boundary sliding.

引用

页码：279 / 286

页数：8

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