Abstract The intergranular cracking and the grain boundary network along the cracks in an austenitic stainless steel 316L after stress corrosion cracking (SCC) test in simulated BWR water were investigated in terms of three-dimensional characterization. It was found that the twin boundaries not only show a strong resistance to cracking, but they could also prevent their neighboring boundaries from cracking, as the cracking probability is lower for boundaries that have higher fraction of neighboring twin boundaries. The propagation of intergranular SCC can be hindered by triple junctions or quadruple junctions in the presence of twin boundaries.

中文翻译：

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模拟BWR环境下奥氏体不锈钢三维晶界网络拓扑结构及其对应力腐蚀裂纹扩展特性的影响

摘要 通过三维表征研究了奥氏体不锈钢316L在模拟BWR水中应力腐蚀开裂（SCC）试验后的晶间开裂和沿裂纹的晶界网络。结果表明，孪晶边界不仅表现出很强的抗开裂能力，而且还可以防止相邻边界开裂，因为相邻孪晶边界比例较高的边界开裂概率较低。在孪晶界存在的情况下，三重连接或四重连接会阻碍晶间 SCC 的传播。