高温模拟压水堆一回路水中枝晶取向对Inconel 182镍基合金焊接金属应力腐蚀开裂的影响
Effect of Dendrite Orientation on SCC of Weld Metal of Nickel-Based Alloy Inconel 182 in PWR Primary Water
李锴 1张维 2郑会 1杨双亮 1许鑫和 3潘登 3崔同明 3吕战鹏3
作者信息
- 1. 国核电站运行服务技术有限公司,上海 200233
- 2. 中核核电运行管理有限公司,海盐 314301
- 3. 上海大学材料科学与工程学院材料研究所,上海 200072
- 折叠
摘要
在模拟压水堆(PWR)一回路高温水中对Inconel182镍基合金焊接金属进行了应力腐蚀开裂(SCC)试验,研究了枝晶取向对其SCC行为的影响.结果表明:在320 ℃下模拟压水堆一回路水中,182合金LT取向试样断口上出现全面沿晶应力腐蚀裂纹扩展带,其平均裂纹扩展速率以及最大裂纹扩展速率均大于290 ℃下相同试样,表明在模拟压水堆一回路水中升高温度对182合金焊接金属应力腐蚀裂纹扩展有促进作用;290 ℃下182合金LT取向试样的平均裂纹扩展速率、最大裂纹扩展速率以及裂纹扩展区宽度占比均大于TL取向试样,表明裂纹沿LT枝晶取向更容易扩展.
Abstract
The effect of dendrite orientation on stress corrosion cracking(SCC)behavior of weld metal of nickel-based alloy Inconel 182 in simulated pressurized water reactor(PWR)high-temperature primary water was investigated by SCC test.The result show that an extensive interdendritic stress corrosion crack growth zone appeared on the fracture surface of the LT-oriented 182 alloy specimen in the simulated PWR primary water at 320 ℃.Both the average crack growth rate and the maximum crack growth rate of the LT-oriented 182 alloy specimen at 320 ℃ were higher than those of the same sample at 290℃,indicating that the stress corrosion crack growth of 182 alloy weld metal was promoted by increasing temperature in the simulated PWR primary water.At 290 ℃,the average crack growth rate,maximum crack growth rate and crack growth zone width ratio of the LT-oriented specimen were greater than those of the TL-oriented specimen,which indicated that cracks were easier to expand along the LT dendrite orientation.
关键词
核电站/焊接金属/182镍基合金/应力腐蚀开裂/枝晶取向/裂纹扩展速率Key words
nuclear power plant/nickel-based alloy 182/stress corrosion cracking/dendrite orientation/crack growth rate引用本文复制引用
基金项目
国家重点研发计划(2019YFB1900904)
国家自然科学基金(51771107)
出版年
2024
NETL
NSTL
万方数据