中国实验快堆奥氏体不锈钢焊接件与钠蒸气的相容性

在400℃高温钠蒸气介质中，对俄罗斯进口的08X16H11M3奥氏体不锈钢中间热交换器与国产304奥氏体不锈钢支撑的焊接件进行了3000h的相容性模拟试验研究。结果表明：在本试验条件下，焊接试样的腐蚀速率很低，其等级为完全耐蚀；与钠蒸气接触的试样焊接区及热影响区表面均未观察到晶间腐蚀；在试验后试样的焊接区和热影响区表面，所有试样均未观察到Na的渗入；在国产304不锈钢热影响区的个别表面位置虽有1～2μm深的晶界小喇叭口出现，但其成分未出现异常；在试验过程中，国产304不锈钢表面出现明显的组分元素溶解扩散，但对材料基体的组织及力学性能未产生明显影响，试验后试样的抗拉强度、屈服强度和延伸率与试验前相比无明显差别，断口形貌与试验前一样仍呈韧性断裂特征。

Compatibility of Austenitic Stainless Steel Weldments and Sodium Vapor for China Experimental Fast Reactor

The simulation test and investigation for the samples of weldment were performed under high temperature sodium vapor at 400 ℃ for 3 000 h. The samples were welded by 08X16H11M3 austenitic stainless steel produced in Russia and 304 austenitic stainless steel produced in China. The measurement and analysis of the corrosion rate, corrosion products, surface micro-morphologies, the composition at grain-boundary were performed for the samples pre- and post- tests, and the results show that there are no inter-granular corrosion which can be observed at the surface contacted with sodium vapor. There are obvious elements diffusion at the surface of 304 stainless steel matrix, but it has no visible influence on the structure of matrix and mechanical properties of the material.