热处理对800H激光焊接接头晶间腐蚀性能的影响  

Effect of heat treatment on intergranular corrosion properties of 800H laser welded joints

作　　者：王康惠 胡树兵[1] 吴雨乐 刘伟[1] WANG Kang-hui;HU Shu-bing;WU Yu-le;LIU wei(State Key Laboratory of Materials Processing and Die&Mould Technology,Huazhong University of Science&Technology,Wuhan 430074,China)

机构地区：[1]华中科技大学材料成型与模具技术国家重点实验室,湖北武汉430074

出　　处：《材料热处理学报》2020年第7期188-194,共7页Transactions of Materials and Heat Treatment

基　　金：国家重点基础研究发展计划(“973计划”)(2014CB046704)。

摘　　要：对800H激光焊接接头进行了不同温度及不同保温时间的热处理,采用电化学双环动电位再活化法测试了不同热处理后焊接接头的晶间腐蚀敏感性,采用晶间线扫的方法解释晶间腐蚀机理,以及采用丝束阵列电极的方法对800H焊接接头焊缝区、热影响区、母材区进行了双环动电位再活化试验。结果表明:800H焊接接头抗晶间腐蚀能力随着热处理温度的升高先降低后增加,并在750℃时降到最低,在850℃以后趋于稳定;焊缝区抗晶间腐蚀能力最强,其次为母材区,抗晶间腐蚀能力最弱的是热影响区。The intergranular corrosion sensitivity of 800 H laser welded joints after heat treatment at different temperatures for different time was measured by electrochemical double-loop dynamic potential reactivation method, the intergranular corrosion mechanism was explained by intergranular line scanning method, and the double-loop dynamic potential reactivation test of weld zone, heat-affected zone and base metal of the 800 H laser welded joints was carried out by tow array electrode method. The results show that the intergranular corrosion resistance of the 800 H laser welded joints decreases first and then increases with the increase of heat treatment temperature, and it reaches the lowest value at 750 ℃, which tends to stabilize when heat treatment temperature is above 850 ℃. The intergranular corrosion resistance in the weld zone is the strongest, followed by the base metal, and the heat affected zone is the weakest.

关 键 词：800H奥氏体不锈钢 激光焊接 晶间腐蚀 

分 类 号：TG456.7[金属学及工艺—焊接]