The heterogeneous microstructure of heat affect zone and its effect on creep resistance for friction stir joints on 9Cr-1.5 W heat resistant steel

被引：28
|
作者：
Zhang, Chao [1 ]
Cui, Lei [1 ]
Wang, Dongpo [1 ]
Liu, Yongchang [1 ]
Liu, Chenxi [1 ]
Li, Huijun [1 ]
机构：
[1] Tianjin Univ, Sch Mat Sci & Engn, Tianjin Key Lab Adv Joining Technol, Tianjin 300354, Peoples R China
来源：
SCRIPTA MATERIALIA | 2019年 / 158卷
基金：
中国国家自然科学基金;
关键词：
Friction stir welding; Heat resistant steel; Heat affect zone; Heterogeneous microstructure; Creep resistance; FERRITIC-MARTENSITIC STEEL; CRACK-GROWTH BEHAVIOR; MECHANICAL-PROPERTIES; P91; STEEL; WELDING PROCESS; WELDMENTS;
D O I：
10.1016/j.scriptamat.2018.08.028
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The heterogeneity of microstructures in heat affect zone of 9Cr-1.5 W heat resistant steel friction stir welding joint was studied, and its influence on the weld creep property was discussed. The inter critical heat affect zone at the advancing side of the weld is found as the most likely area to be failure during creep, owing to the formation of ferrite grains and lath martensite with low carbon content and the coarsening of M23C6 carbides. The as-welded joint exhibits a good creep resistance of 1173.8 h creep rupture time at 600 degrees C temperature and 200 MPa stress. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：6 / 10
页数：5
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