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

作　　者：李锴[1] 张维 郑会[1] 杨双亮 许鑫和 潘登 崔同明 吕战鹏[3] LI Kai;ZHANG WEI;ZHENG Hui;YANG Shuangliang;XU Xinhe;PAN Deng;CUI Tongming;LYU Zhanpeng(State Nuclear Power Service Company,Shanghai 200333,China;China National Nuclear Power Operation Management Co.,Ltd.,Haiyan 314301,China;Institute of Materials,School of Materials Science and Engineering,Shanghai University,Shanghai 200072,China)

机构地区：[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

出　　处：《腐蚀与防护》2024年第5期6-11,共6页Corrosion & Protection

基　　金：国家重点研发计划(2019YFB1900904);国家自然科学基金(51771107)。

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。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 

分 类 号：TG172[金属学及工艺—金属表面处理]