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Inconel 690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.
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