690合金在高温水中的应力腐蚀裂纹扩展行为

金属学报, 2010, 46(10): 1267-1274. doi: 10.3724/SP.J.1037.2010.00199

690合金在高温水中的应力腐蚀裂纹扩展行为

但体纯 ^1, , 吕战鹏 ^2, , 王俭秋 ^3, , 韩恩厚 ^4, , 庄子哲雄 ^5, , 柯伟 ^6,

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

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.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

5.日本东北大学断裂与可靠性研究中心,仙台,980-8579

6.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

基金项目: 日本PEACE-E项目国家重点基础研究发展计划项目(G2006CB60500)

关键词：应力腐蚀 , 裂纹扩展 , 交流电位降 , 高温水

CRACK GROWTH BEHAVIOR FOR STRESS CORROSION CRACKING OF 690 ALLOY IN HIGH TEMPERATURE WATER

用交流电位降(ACPD)技术实现了模拟压水堆一回路340℃高温水环境中690合金应力腐蚀裂纹扩展的实时监测.断口观察表明,2种一维冷加工690合金均出现沿晶应力腐蚀裂纹扩展,裂纹沿平行轧制方向的扩展速率略高于垂直轧制方向的速率;当溶解H浓度(CdH)由30 μL/g减小到10 μL/g时,经1075℃退火和700℃固溶处理15h并--维冷轧25%的T-L取向690合金的平均裂纹扩展速率由4.8×10(-11)m/s增加至11.2×10(-11)m/s;应力腐蚀裂纹扩展主要为内氧化机制.

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