Inconel 690合金在含Pb碱溶液中的应力腐蚀行为  

Effect of heat treatment on stress corrosion behavior of alloy 690 in caustic solution containing Pb

作　　者：李成涛 宋利君 任爱 刘飞华 李岩 程学群[2] 李晓刚[2] 

机构地区：[1]苏州热工研究院电站寿命管理研究中心,江苏苏州215004 [2]北京科技大学新材料技术研究院,北京100083

出　　处：《材料热处理学报》2013年第10期38-42,共5页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金(钢铁联合研究基金)(U1260201);国家高技术研究发展计划(863)(2012AA050901)

摘　　要：采用扫描电镜(SEM)、背散射电子衍射分析技术(EBSD)等方法分析不同温度固溶处理(1090℃,1100℃)的Inconel690合金微观组织,并用恒变形方法研究了该Inconel 690合金在含Pb氢氧化钠溶液中的应力腐蚀行为。结果表明,固溶处理温度1100℃的试验合金具有更好的组织均匀性,低重合点阵晶界所占比例更高。固溶处理温度1090℃的试验合金在含Pb氢氧化钠溶液中具有更强的应力腐蚀敏感性。综合分析试验结果,较低的固溶处理温度导致690合金的低重合点阵晶界所占比例低,增加了其在含Pb氢氧化钠溶液中的应力腐蚀敏感性。Microstructure of alloy 690 solid-solutioned at different temperatures was investigated by SEM and EBSD technique. The stress corrosion behavior of alloy 690 in NaOH solution containing Pb was studied by a constant strain method. SEM and EBSD results show that the microstructure of alloy 690 solutioned at 1100 ℃ is more uniform. Alloy 690 mill treated at 1100 ℃ has the higher proportion of low coincidence site lattice grain boundaries. The results of stress corrosion test at high temperature and high pressure condition show that alloy 690 treated at 1090℃ exhibits higher stress corrosion sensitivity in the test solution. The alloy 690 solution-treated at the lower temperature has the lower proportion of low coincidence site lattice grain boundaries,which increases the stress corrosion sensitivity in NaOH solution containing Pb.

关 键 词：690合金 热处理 SEM 应力腐蚀 铅 

分 类 号：TG172.9[金属学及工艺—金属表面处理]