690合金在高温水中的应力腐蚀裂纹扩展行为
来源期刊：金属学报2010年第10期
论文作者：但体纯 吕战鹏 王俭秋 韩恩厚 庄子哲雄 柯伟
文章页码：1267 - 1274
关键词：应力腐蚀； 裂纹扩展； 交流电位降； 高温水
Key words：stress corrosion cracking (SCC)； crack growth； alternative current potential drop (ACPD)； high-temperature water
摘 要：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30μL/g减小到10μL/g时,经1075℃退火和700℃固溶处理15h并一维冷轧25%的T-L取向690合金的平均裂纹扩展速率由4.8×10-11m/s增加至11.2×10-11m/s;应力腐蚀裂纹扩展主要为内氧化机制.
Abstract: Stress corrosion crack growth rates of alloy 690 thermally treated (TT) after one- directionally (1D) cold-rolling along the longitudinal (L) direction and three-directionally (3D) cold- rolling were successfully measured by ACPD technique in deoxygenated water with different dissolved hydrogen contents (CdH at 340℃.The fracture mode is mainly intergranular mode in both two kinds of alloy 690TT.The crack growth rates in the T-L orientation are higher than those in the L-T orientation in 340℃ deoxygenated environments.For 1D 25% alloy 690TT with T-L orientation, the measured average crack growth rate is 4.8×10-11 m/s in 340℃ water with CdH 30μL/g,and the measured average crack growth rate is l.l×l0-10 m/s in 340℃ water with CdH 10μL/g.The mechanism of crack growth is internal oxidation mechanism.
但体纯1，吕战鹏2，王俭秋1，韩恩厚2，庄子哲雄0，柯伟1
(1.辽宁省沈阳市科学院金属研究所金属腐蚀与防护国家重点实验室
2.日本东北大学 断裂与可靠性研究中心)
摘 要：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30μL/g减小到10μL/g时,经1075℃退火和700℃固溶处理15h并一维冷轧25%的T-L取向690合金的平均裂纹扩展速率由4.8×10-11m/s增加至11.2×10-11m/s;应力腐蚀裂纹扩展主要为内氧化机制.
关键词：应力腐蚀； 裂纹扩展； 交流电位降； 高温水
