Effect of grain boundary character distribution on stress corrosion cracking behavior in austenitic stainless steels
Effect of grain boundary character distribution on stress corrosion cracking behavior in austenitic stainless steels
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DOI：
10.4028/www.scientific.net/msf.475-479.3863
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发表时间：
2005-01-01
期刊：
影响因子：
--
通讯作者：
Shoji, T
中科院分区：
文献类型：
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作者：
Ishibashi, R;Horiuchi, T;Shoji, T
实验验证了晶界特征分布（GBCD）对奥氏体不锈钢在高温水中晶间应力腐蚀开裂（IGSCC）的影响。使用应变退火方法的 GBCD 控制增加了奥氏体不锈钢中低西格玛重合点晶界 (CSL) 边界的比例和随机晶界的分段网络。 GBCD 受控钢的低西格玛 CSL 边界分数为 75-85%，而非受控钢的低西格玛 CSL 边界分数为 60-70%。在 561 K、含有 8 ppm 溶解氧的纯水中进行了缝隙弯梁测试，以进行应力腐蚀开裂 (SCC) 评估。测试表明，GBCD 控制抑制了 IGSCC 的引发或扩展，并且裂纹主要沿着随机晶界扩展。据认为，诱导的较低西格玛 CSL 边界会导致对 IGSCC 的高抵抗力。
The effect of grain boundary character distribution (GBCD) on intergranular stress corrosion cracking (IGSCC) in austenitic stainless steels in high temperature water was verified experimentally. GBCD control using the strain annealing method increased the fraction of low-Sigma coincidence site lattice (CSL) boundaries and the segmentalized network of random grain boundaries in austenitic stainless steels. The fractions of low-Sigma CSL boundaries of GBCD controlled steels were 75-85%, while those of uncontrolled steels were 60-70%. Creviced bent beam tests were conducted at 561 K in pure water containing 8 ppm dissolved oxygen for stress corrosion cracking (SCC) evaluation. The tests revealed that GBCD control suppressed IGSCC initiation or propagation and that cracks were predominantly propagated along random grain boundaries. It is considered that induced lower-Sigma CSL boundaries result in high resistance to IGSCC.