Environment assisted cracking of 308L weld metal in high temperature water

被引：13
|
作者：
Wang, Jiamei [1 ]
Zhu, Tianyu [1 ]
Han, Yaolei [2 ]
Mei, Jinna [2 ]
Xue, Fei [2 ]
Chen, Kai [1 ]
Du, Donghai [1 ]
Andresen, Peter L. [1 ]
Zhang, Lefu [1 ]
Zhang, Miaomiao [3 ]
机构：
[1] Shanghai Jiao Tong Univ, Sch Nucl Sci & Engn, Shanghai 200240, Peoples R China
[2] Suzhou Nucl Power Res Inst, Suzhou 215004, Peoples R China
[3] Shanghai Nucl Equipment Test & Verificat Ctr, Shanghai 201412, Peoples R China
来源：
JOURNAL OF NUCLEAR MATERIALS | 2021年 / 557卷
关键词：
Stainless steel welds; Thermal aging; Stress corrosion cracking; Corrosion fatigue; High temperature water; STRESS-CORROSION CRACKING; AUSTENITIC STAINLESS-STEELS; GROWTH BEHAVIOR; DISSOLVED-OXYGEN; ALLOY; 690; SUSCEPTIBILITY; EMBRITTLEMENT; CHEMISTRY; CHLORIDE; ISSUES;
D O I：
10.1016/j.jnucmat.2021.153275
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The environment assisted cracking (EAC) behavior, including stress corrosion cracking (SCC) and corrosion fatigue (CF), of a low carbon 308 L stainless steel weld metal was evaluated in high temperature water. The effects of thermal aging (400 degrees C for 10,0 00 h) on the crack growth rate (CGR) are discussed. Experimental results reveal an environmental acceleration effect on CGRs with decreasing loading frequency, and the environmental enhancement factor reached a value of 50 when the frequency was decreased to 0.00001 Hz. The 308 L weld metal showed excellent SCC resistance regardless of the thermal aging or water chemistry, which is related to the low carbon content and well-controlled duplex microstructure. After thermal aging, the ferrite/austenite (gamma/delta) phase boundaries show negligible sensitization, consistent with the low carbon concentration. No preference of the gamma/delta crack path and no elevated EAC either with thermal aging or in oxidizing water was attributed to the no sensitization of the gamma/delta boundaries before and after thermal aging. (C) 2021 Elsevier B.V. All rights reserved.
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页数：13
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