热处理对CLAM钢TIG焊接接头显微组织影响  

Effect of post weld heat treatment on microstructure and hardness on CLAM steel TIG weld

作　　者：雷玉成[1] 邵奇栋[1] 朱强[1] 尹莎[1] 巨新[2] 

机构地区：[1]江苏大学材料科学与工程学院,江苏镇江212013 [2]北京科技大学物理系,北京100083

出　　处：《江苏大学学报（自然科学版）》2010年第5期535-538,共4页Journal of Jiangsu University：Natural Science Edition

基　　金："973"国家重点基础研究计划项目(2008CB717802);江苏省研究生创新计划项目(CX09B_195Z)

摘　　要：采用TIG焊接方法对中国低活化马氏体钢(CLAM钢)进行了平板对接试验,分别对焊接接头采用不同温度的焊后热处理,试验温度分别为610,660,710,760,810℃,保温30 min.结果表明,焊后进行热处理与不做热处理两种情况下,CLAM钢焊接接头微观形貌和硬度存在很大不同;随温度增加,焊接接头焊缝中马氏体板条分布及尺寸均匀性得到提高,热处理温度710℃以上时板条均匀性最好,但晶粒尺寸与板条也会随温度升高而长大.焊后热处理使焊接接头各部分硬度随热处理温度的升高而逐渐降低,焊缝金属硬度下降值比母材和焊缝热影响区大得多,尤其在810℃时焊缝金属硬度下降值最大,降至与母材硬度相当.China Low Activation Martensitic（CLAM） steel was butt-welded by tungsten-inert-gas wel-ding.Post welding heat treatment（PWHT） was performed at different temperatures（610,660,710,760,810℃） for 30 min.There is great difference on microstructure and hardness of CLAM steel TIG weld before and after PWHT.With the rise of PWHT temperature,the distribution and size of martensitic lath are more uniform,especially above 710℃.But the size of crystal and the martensitic lath width are growing.PWHT made the hardness of the welding joint lower.The higher the post welding heat treatment temperature is,the lower the hardness results are.The hardness of weld metal decreased more than that of the heat affected zone and the base metal.When the PWHT temperature reached 810℃,the hardness of the weld material droped obviously,almost reaching the hardness of the base metal.

关 键 词：CLAM TIG 热处理 微观结构 硬度 

分 类 号：TG404[金属学及工艺—焊接]