Effects of Long-Term Service on Microstructure and Impact Toughness of the Weld Metal and Heat-Affected Zone in CrMoV Steel Joints

被引：5
作者：
Sun, Qixing [1 ,2 ]
Li, Xiaogang [1 ,2 ]
Li, Kejian [1 ,2 ]
Cai, Zhipeng [1 ,2 ,3 ,4 ]
Han, Chaoyu [1 ,2 ]
Li, Shanlin [1 ,2 ]
Gao, Dangxun [5 ]
Pan, Jiluan [1 ,2 ]
机构：
[1] Tsinghua Univ, Dept Mech Engn, Beijing 100084, Peoples R China
[2] Minist Educ, Key Lab Adv Mat Proc Technol, Beijing 100084, Peoples R China
[3] Tsinghua Univ, State Key Lab Tribol, Beijing 100084, Peoples R China
[4] Tsinghua Univ, Collaborat Innovat Ctr Adv Nucl Energy Technol, Beijing 100084, Peoples R China
[5] Tsinghua Univ, Fundamental Ind Training Ctr, Beijing 100084, Peoples R China
来源：
METALS | 2022年 / 12卷 / 02期
基金：
中国国家自然科学基金;
关键词：
weld metal; heat-affected zone; long-term service; phosphorus segregation; toughness; GRAIN-BOUNDARY SEGREGATION; TEMPER EMBRITTLEMENT; MECHANICAL-PROPERTIES; FRACTURE-TOUGHNESS; THERMAL HISTORY; PHOSPHORUS; TENSILE;
D O I：
10.3390/met12020278
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The microstructure and impact toughness of weld metals (WMs) and heat-affected zones (HAZs) of a low-alloy CrMoV steel gas turbine rotor which had served for 14 years were investigated. The ex-service joints in the turbine part (serving at 500-540 degrees C) and the compressor part (serving below 300 degrees C) of the rotor were selected for comparative research. The microstructure of the WMs and HAZs between the turbine part and the compressor part was similar, indicating that there was no significant deterioration in microstructure of the turbine part during service. However, compared with the compressor part WM, the impact energy of the turbine part WM decreased significantly, and FATT(50) increased greatly. The degraded toughness of turbine part WM was related to more serious intergranular cracking caused by higher segregation level of phosphorus (P) at prior austenite grain (PAG) boundaries. Welding and post-weld heat treatment led to obvious segregation of P at PAG boundaries in WMs, and the segregation of P in turbine part WM was further aggravated during serving at 500-540 degrees C. Additionally, the inhomogeneous microstructure of the WMs also aggravated the segregation of P. The toughness of the HAZs in both turbine part and compressor part was high, which was because of fine grains. Furthermore, due to there being more grain boundaries and low P content, the segregation of P in HAZs was slight and its adverse effect on the toughness could be ignored.
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页数：15
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