690TT合金划痕显微组织及划伤诱发的应力腐蚀

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

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 ^2, , 韩恩厚 ^3, , 庄子哲雄 ^4, , 柯伟 ^5,

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.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

3.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

4.日本东北大学断裂与可靠性研究中心,仙台980-8579

5.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

关键词：镍基690合金 , 表面划伤 , 显微组织 , 应力腐蚀开裂

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

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.

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材料期刊网

690TT合金划痕显微组织及划伤诱发的应力腐蚀

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

参考文献