一、我厂承担核电站装料机任务,其中有些零件用1Cr18Ni9Ti钢制造,毛坯厚度60mm,而且需经晶界腐蚀试验证明无晶界腐蚀倾向。开始时,我厂有关部门将此材料的热处理找外单位协作热处理,采用了1070℃的固溶处理,其金相组织为奥氏体。但经650℃保温1小时(敏化处理)晶界处有大量的(Or、Fe)_(23)C_6富集(图1)。我们通过扫描 First, I assume the plant loading nuclear power plant tasks, some of which parts with 1Cr18Ni9Ti steel, rough thickness of 60mm, and subject to intergranular corrosion test to prove non-grain boundary corrosion tendency. At the beginning, I plant the relevant departments of this material to find the heat treatment units outside the collaborative heat treatment, the use of 1070 ℃ solution treatment, the microstructure of austenite. However, there was a large amount of (Or, Fe) _ (23) C_6 enrichment in the grain boundaries at 650 ℃ for 1 hour (sensitized treatment) (Fig. 1). We passed the scan