利用控温水浴锅,对经不同热处理工艺处理的SWRS82B盘条钢的原奥氏体晶界浸蚀方法进行系统研究。结果表明:对热处理试样进行250～300℃中温回火1～2 h后,在80～85℃水浴锅中用过饱和苦味酸20mL+洗洁精3～5mL侵蚀50～150s,可清晰显示出不同状态下的奥氏体晶界。分析可知,碳化物的析出情况是回火后易侵蚀出奥氏体晶界的主要原因。 A controlled hot-water bath was used to systematically study the original austenite grain boundary etching method of SWRS82B steel with different heat treatment processes. The results showed that after heat treatment at 250 ~ 300 ℃ for 1 ~ 2 h, the samples were treated with saturated picric acid 20mL and detergents 3 ~ 5mL in water bath 80 ~ 85 ℃ for 50 ~ 150 s, Austenite grain boundaries in different states. Analysis shows that the precipitation of carbide is easy to erode the austenite grain boundaries after tempering the main reason.