高铝310S耐热钢板材的焊接性能简

 对铝含量为2%、4%(质量分数，下同)的310S耐热钢板材采用手工氩弧焊(TIG)的焊接方法进行焊接，利用光学显微镜对焊缝的显微组织进行分析，利用电子探针(EMPA)分析焊接母材的元素分布，并对焊接接头进行室温和高温(800℃)力学性能测试。结果表明：不同铝含量的310S耐热钢板材焊接后的组织均良好，都没有宏观裂纹及夹杂等缺陷；铝元素的加入，抑制了焊接热影响区晶粒的异常长大，细化了晶粒；高铝310S的焊接板材与母材一样具有优良的室温力学性能和高温力学性能，加铝310S耐热钢具有良好的焊接性能。

Welding Property of High Alumina 310S Heat-Resistant Steel Plates

310S based steels plate with the content of 2%, 4% aluminum were welded by manual argon tungsten arc welding. The microstructure of the weld was investigated by optical microscopy, and the element distribution of welding base metal was investigated by electron microprobe analysis (EMPA). The mechanical properties of welded specimens and base steels were tested at room temperature and high temperature ( 800℃). The result shows that, microstructures of different aluminum-containing steels are uniform and there are no macro defects such as crack and inclusions. The addition of Al is conductive to suppress growth of the grain size in the welded zone and the refinement of the grains. The welded joints of high alumina 310S heat-resistant steel plate show excellent mechanical properties at room temperature and high temperature similar to that of base metal. Weldability of 310S steel with aluminum is good.