金属学报  2011, Vol. 47 Issue (7): 839-846    DOI: 10.3724/SP.J.1037.2011.00213

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690TT合金划痕显微组织及划伤诱发的应力腐蚀

孟凡江1), 王俭秋1), 韩恩厚1), 庄子哲雄2), 柯伟1)

1) 中国科学院金属研究所腐蚀与防护国家重点实验室, 沈阳 110016 2) 日本东北大学断裂与可靠性研究中心, 仙台 980-8579

MICROSTRUCTURE NEAR SCRATCH ON ALLOY 690TT AND STRESS CORROSION INDUCED BY SCRATCHING

MENG Fanjiang1), WANG Jianqiu1), HAN En-Hou1), SHOJI Testuo2), KE Wei1)

1) State Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016 2) Fracture and Reliability Research Institute, Tohoku University,  Sendai 980-8579, Japan

孟凡江 王俭秋 韩恩厚 庄子哲雄 柯伟. 690TT合金划痕显微组织及划伤诱发的应力腐蚀[J]. 金属学报, 2011, 47(7): 839-846.
, . MICROSTRUCTURE NEAR SCRATCH ON ALLOY 690TT AND STRESS CORROSION INDUCED BY SCRATCHING[J]. Acta Metall Sin, 2011, 47(7): 839-846.

摘要 参考文献 相关文章 Metrics 全文: PDF(1761 KB)   摘要: 测试表明, 690TT合金划痕周围形成了加工硬化区, 范围可达100 μm. TEM及EBSD-OIM组织观察发现, 划痕沟槽处的基体组织出现了一定程度的纳米化. 在330 ℃碱溶液中的浸泡实验表明, 划伤诱发了690TT合金应力腐蚀裂纹的萌生和扩展, 划伤过程中形成的变形晶界、孪晶界以及产生的微观裂纹成为应力腐蚀裂纹优先萌生的位置. Pb的存在使氧化膜变得疏松, 加速了基体的溶解和氧化. 随着溶液中Pb含量的增加, 划伤诱发的应力腐蚀裂纹长度随之增加. 690TT合金表面划伤严重降低了材料抵抗应力腐蚀开裂的能力. 关键词 ： 镍基690合金,  表面划伤,  显微组织,  应力腐蚀开裂     Abstract：The microstructure and stress corrosion cracking (SCC) behavior of scratched zone on alloy 690TT were studied by using microhardness, TEM, EBSD-OIM and immersion experiment in caustic solution. It was found that a deformed hardening layer with a dimension range of 100 $\mu$m was produced near the scratch. TEM and EBSD-OIM observations showed that the grains at shallow surface of scratch groove were refined to nano-size. SCC tests for scratched alloy 690TT were performed in caustic solution at high temperature with or without addition of lead oxides. The results showed that SCC cracks initiated and propagated at scratch banks and scratch grooves. Grain boundaries, twin boundaries deformed and microcracks produced during scratching process are preferential sites for SCC. The oxide films formed on scratch groove were loosed by lead. The SCC crack length increased with increase of lead content. Scratched alloy 690TT is susceptible to SCC. Key words： Ni base alloy 690    surface scratch    microstructure    stress corrosion cracking 收稿日期: 2011-04-06      基金资助: 国家重点基础研究发展计划资助项目2006CB605000 作者简介: 孟凡江, 男, 1982年生, 博士生 服务 把本文推荐给朋友 加入引用管理器 E-mail Alert RSS 作者相关文章 王俭秋 孟凡江 44.8K 链接本文: https://www.ams.org.cn/CN/10.3724/SP.J.1037.2011.00213      或      https://www.ams.org.cn/CN/Y2011/V47/I7/839 [1] Ding X S. Nucl Power Plants, 2003; 4: 11 (丁训慎. 核电站, 2003; 4: 11) [2] Blanchet J, Coriou H, Grall L, Mahieu C, Otter C, Turluer G. 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