45钢焊接接头组织与性能分析  

Analysis on Microstructure and Properties of 45 Steel Welded Joints

作　　者：代雪佳[1] 凌泽民[1] 刘明翔[1] 冷林霞[2] 

机构地区：[1]重庆大学材料科学与工程学院,重庆4000442 [2]重庆大学国家重点传动实验室,重庆400044

出　　处：《热加工工艺》2014年第3期184-185,189,共3页Hot Working Technology

摘　　要：通过金相观察和硬度测试实验,研究了45钢在不同焊接电流下焊接接头的组织、性能变化规律,并分析了t8/5对焊接接头组织和性能的影响。结果表明:焊接接头中焊缝处金属的硬度最大;随着t8/5的减小,45钢在淬火区产生更多的脆硬马氏体,导致焊接接头硬度增大;增大t8/5,可以减少或避免淬火组织的产生,改善钢的焊接性能。The microstructure and properties of the welded joint of 42CrMo steel was analyzed at different levels of welding current. The impact of t8/5 on the microstructure and properties of the welded joint was also studied. The results show that the microhardness of the weld metals is much higher than that of welded joint. With t8/5 decreasing, more brittle martensite is produced in the quenching zone of 45 steel, resulting in the increase of the hardness of welded joints. It is possible to reduce or avoid the generation of the quenched structure by increasing t8/5, thus improving the properties of the steel.

关 键 词：45钢 TIG 焊接接头 热循环曲线 t8 5 

分 类 号：TG457.11[金属学及工艺—焊接]