Synergistic effects of local strain-hardening and dissolved oxygen on stress corrosion cracking of 316NG weld heat-affected zones in simulated BWR environments
Synergistic effects of local strain-hardening and dissolved oxygen on stress corrosion cracking of 316NG weld heat-affected zones in simulated BWR environments
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DOI：
10.1016/j.jnucmat.2011.12.030
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发表时间：
2012-04
影响因子：
3.1
通讯作者：
Zhanpeng Lu;T. Shoji;H. Xue;F. Meng;C. Fu;Y. Takeda;K. Negishi
中科院分区：
文献类型：
--
作者：
Zhanpeng Lu;T. Shoji;H. Xue;F. Meng;C. Fu;Y. Takeda;K. Negishi
在高温水中对316NG焊缝热影响区（高硬化区和中硬化区）的应力腐蚀裂纹扩展情况进行了监测。焊缝熔合线附近的裂纹既表现出宏观分岔，又表现出广泛的微观分支，其速度要快于中间硬化区出现的裂纹扭结。材料硬化与溶解氧对裂纹扩展有相互作用。单次超载对316NG热影响区裂纹扩展的影响小于冷加工316NG不锈钢。
Stress corrosion cracking growth during long-term test in high temperature water was monitored in two 316NG weld heat-affected zones representing highly hardened and medially hardened regions. Cracking near the weld fusion line exhibited both macroscopic bifurcation and extensive microscopic branching, which was faster than that in the medially hardened region where crack kinking was observed. There is an interaction between material hardening and dissolved oxygen on crack growth. The effect of a single overloading on crack growth in 316NG heat-affected zones is less significant than that in a cold worked 316NG stainless steel.