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The role of dislocation channeling in IASCC initiation of neutron irradiated austenitic stainless steel.

机译：位错通道在中子辐照奥氏体不锈钢的IASCC引发中的作用。

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摘要

The objective of this study was to understand the role of dislocation channeling in the initiation of irradiation-assisted stress corrosion cracking (IASCC) of neutron irradiated austenitic stainless steel using a novel four-point bend test. Stainless steels used in this study were irradiated in the BOR-60 fast reactor at 320 °C, and included a commercial purity 304L stainless steel irradiated to 5.5, 10.2, and 47.5 dpa, and two high purity stainless steels, Fe-18Cr-12Ni and Fe-18Cr-25Ni, irradiated to ~10 dpa. The four-point bend test produced the same relative IASCC susceptibility as constant extension rate tensile (CERT) experiments performed on the same irradiated alloys in boiling water reactor normal water chemistry. The cracking susceptibility of the CP 304L alloy was high at all irradiation dose levels, enhanced by the presence of MnS inclusions in the alloy microstructure, which dissolve in the NWC environment. Dissolution of the MnS inclusion results in formation of an oxide cap that occludes the inclusion site, creating a crevice condition with a high propensity for crack initiation. Crack initiation at these locations was induced by stress concentration at the intersecting grain boundary, resulting from the intersection of a discontinuous dislocation channels (DC). Stress to initiate an IASCC crack decreased with dose due earlier DC initiation. The HP Fe-18Cr-12Ni alloy had low susceptibility to IASCC, while the high Ni alloy exhibited no cracking susceptibility. The difference in susceptibility among these conditions was attributed to the propensity for DCs to transmit across grain boundaries, which controls stress accumulation at DC -- grain boundary intersections.
机译：这项研究的目的是使用新型四点弯曲试验了解位错通道在中子辐照奥氏体不锈钢辐照辅助应力腐蚀开裂（IASCC）引发中的作用。本研究中使用的不锈钢在320°C的BOR-60快速反应器中进行了辐照，包括辐照到5.5、10.2和47.5 dpa的商业纯度304L不锈钢，以及两种高纯度的Fe-18Cr-12Ni不锈钢。和Fe-18Cr-25Ni，辐照〜10 dpa。四点弯曲试验产生的IASCC相对磁化率与在沸水反应堆常规水化学中对相同辐照合金进行的恒定延伸率拉伸（CERT）实验相同。 CP 304L合金的裂纹敏感性在所有辐照剂量水平下都很高，这是由于合金微结构中存在MnS夹杂物而增加的，该夹杂物溶解在NWC环境中。 MnS夹杂物的溶解会导致形成一个堵塞夹杂物部位的氧化层，从而形成具有很高裂纹萌生倾向的缝隙条件。在这些位置的裂纹萌生是由相交晶界处的应力集中引起的，这是由于不连续位错通道（DC）的相交而产生的。由于较早的DC引发，引发IASCC裂纹的应力随剂量降低。 HP Fe-18Cr-12Ni合金对IASCC的敏感性较低，而高Ni合金则无裂纹敏感性。这些条件之间的敏感性差异归因于DC跨晶界传输的倾向，这控制了DC-晶界相交处的应力积累。

著录项

  • 作者

    Stephenson, Kale Jennings.;

  • 作者单位

    University of Michigan.;

  • 授予单位 University of Michigan.;
  • 学科 Materials science.
  • 学位 Ph.D.
  • 年度 2016
  • 页码 348 p.
  • 总页数 348
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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