Impact of localized deformation on IASCC in austenitic stainless steels
Impact of localized deformation on IASCC in austenitic stainless steels
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DOI：
10.1016/j.jnucmat.2010.10.087
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发表时间：
2011-01-31
影响因子：
3.1
通讯作者：
Was, G. S.
中科院分区：
文献类型：
--
作者：
Jiao, Z.;Was, G. S.
局部变形已被确定为 IASCC 的潜在主要影响因素。使用 2-3.2 MeV 质子在 360 摄氏度下对七种奥氏体合金进行 1 和 5 dpa 的辐照，并在模拟沸水堆环境和氩气中进行测试。使用每单位面积的裂纹长度在 1% 和 3% 应变间隔下评估裂纹敏感性。对堆垛层错能 (SFE)、硬度、辐射诱导偏析 (RIS) 和局部变形进行了表征，并使用建议的术语“相关强度”评估了它们与裂纹的相关性。 SFE 和硬度都会导致裂纹，但都不是主导因素。 RIS 在本研究中并未发挥重要作用。发现局部变形与 IASCC 的相关强度显着高于其他参数，这意味着局部变形是 IASCC 中最重要的因素。虽然还没有很好地理解，但局部变形可能会通过滑移通道中位错与晶界的强烈相互作用而促进裂纹。 (C) 2010 Elsevier B.V. 保留所有权利。
Localized deformation has been identified as a potential primary contributor to IASCC. Seven austenitic alloys were irradiated to 1 and 5 dpa at 360 degrees C using 2-3.2 MeV protons and were tested both in simulated BWR environment and in argon. Cracking susceptibility was evaluated at both 1% and 3% strain intervals using crack length per unit area. Stacking fault energy (SFE), hardness, radiation-induced segregation (RIS) and localized deformation were characterized and their correlations with cracking were evaluated using a proposed term, correlation strength. Both SFE and hardness contributed to cracking but neither was the dominant factor. RIS did not play an important role in this study. The correlation strength of localized deformation with IASCC was found to be significantly higher than for others parameters, implying that localized deformation is the most important factor in IASCC. Although not well understood, localized deformation may promote cracking through intensive interaction of dislocations in slip channels with grain boundaries. (C) 2010 Elsevier B.V. All rights reserved.