• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文学位 >THE EFFECT OF NITROGEN ON SENSITIZATION AND STRESS CORROSION CRACKING OF AISI 304 STAINLESS STEELS (SLOW STRAIN RATE, POLARIZATION CURVES, THERMODYNAMIC MODELING TESTS, AQUEOUS, ELECTRON-OPTICS).
【24h】

THE EFFECT OF NITROGEN ON SENSITIZATION AND STRESS CORROSION CRACKING OF AISI 304 STAINLESS STEELS (SLOW STRAIN RATE, POLARIZATION CURVES, THERMODYNAMIC MODELING TESTS, AQUEOUS, ELECTRON-OPTICS).

机译：氮对AISI 304不锈钢的敏感性和应力腐蚀开裂的影响（慢应变速率，极化曲线，热力学模型测试，水溶液，电子光学）。

获取原文
获取原文并翻译 | 示例
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Sensitization in the heat affected zones of AISI 304 stainless steel (SS) welded piping of boiling water reactors (BWR) has caused intergranular stress corrosion cracking (IGSCC) failures. New grades with reduced carbon levels, to prevent IGSCC, and nitrogen additions to improve strength, have been proposed as alternative materials, although no systematic study of the effect of nitrogen on SCC of these SS in BWR environments has yet been conducted.; This investigation involved both theoretical modeling and experimental studies. Thermodynamic and kinetic modeling of sensitization were carried out. Electrochemical potentiokinetic reactivation tests and analytical electron microscopy were performed to study sensitization behavior. Slow strain rate tests and scanning electron microscopy were used to study SCC resistance. Anodic polarization tests were also performed.; The results of the sensitization studies show that nitrogen up to 0.16 wt.% increases the chromium concentration at the grain boundary (X(,Cr)('i)) and decreases the width of the chromium depleted zone adjacent to the grain boundary, thereby lowering the degree of sensitization (DOS). However, carbon additions increase the DOS. The results of the SCC studies show that (1) nitrogen up to 0.16 wt.% increases the IGSCC resistance, but nitrogen of 0.25 wt.% causes TGSCC, (2) nitrogen up to 0.16 wt.% increases the critical potential (E(,SCC)) for SCC, while carbon additions decrease it, (3) the potential ranges at which IGSCC and simultaneous IGSCC, TGSCC and pitting occurred correspond to the passive range and the potentials above the breakdown of passivity on the polarization curves respectively.; The mechanism by which nitrogen retards sensitization is by increasing X(,Cr)('i) and hence retarding the growth of the carbides. The mechanism of IGSCC is film rupture followed by anodic dissolution of the chromium depleted areas along the grain boundaries. There is a good correlation between the SCC and sensitization studies, for example, E(,SCC) and the fracture mode at potentials above it are dependent on the DOS. Nitrogen of 0.25 wt.% is not beneficial because it causes discontinuous precipitation of chromium carbides and promotes a planar array of mobile dislocations.
机译：AISI 304不锈钢（SS）沸水反应堆（BWR）焊接管道的热影响区中的敏化已引起晶间应力腐蚀开裂（IGSCC）故障。已经提出了降低碳含量以防止IGSCC和添加氮以提高强度的新牌号作为替代材料，尽管尚未对BWR环境中氮对这些SS的SCC进行系统研究。这项研究涉及理论建模和实验研究。进行敏化的热力学和动力学模型。进行了电化学电位动力学再活化试验和分析电子显微镜，以研究敏化行为。慢应变速率测试和扫描电子显微镜用于研究抗SCC性。还进行了阳极极化测试。敏化研究的结果表明，氮含量高达0.16 wt。％，会增加晶界处的铬浓度（X（，Cr）（'i）），并减小与晶界相邻的贫铬区域的宽度，从而降低敏感度（DOS）。但是，碳的添加会增加DOS。 SCC研究的结果表明（1）氮含量高达0.16 wt。％会提高IGSCC电阻，但是0.25 wt。％的氮会导致TGSCC，（2）氮含量高达0.16 wt。％会增加临界电势（E（ （SCC）），而碳的添加会降低碳的含量，（3）发生IGSCC以及同时发生IGSCC，TGSCC和点蚀的电位范围分别对应于被动范围和极化曲线上钝化击穿上方的电位。氮阻止敏化的机理是通过增加X（，Cr）（'i）并因此阻止碳化物的生长。 IGSCC的机制是薄膜破裂，然后沿晶界阳极溶解贫铬区域的阳极溶解。 SCC和敏化研究之间有很好的相关性，例如E（，SCC）和高于它的电势下的断裂模式取决于DOS。 0.25重量％的氮是无益的，因为它引起碳化铬的不连续沉淀并且促进了可移动位错的平面阵列。

著录项

  • 作者

    MOZHI, T. ARUL.;

  • 作者单位

    The Ohio State University.;

  • 授予单位 The Ohio State University.;
  • 学科 Engineering Metallurgy.; Engineering Materials Science.
  • 学位 Ph.D.
  • 年度 1986
  • 页码 295 p.
  • 总页数 295
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 冶金工业;工程材料学;
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号