冷焊高硬度钢焊缝焊态韧性研究

ON TOUGHNESS OF THE COLDWELDING METAL WITH HIGH HARDNESS

在硬度ＨＲＣ５５冷焊钢焊缝中，利用Ｎｂ，Ｔｉ，Ｖ，Ｚｒ，Ｒｅ进行复合变质处理，以期改善焊态抗裂性．经光镜、电镜、Ｘ－射线萤光、电子探针分析表明，细粒状、弥散化碳化物的早期大量析出，可抑制碳化物沿柱状晶界的网状析出；强碳化物形成元素的存在，能导致高碳焊缝的基体组织“贫碳”而转变为低碳板条马氏体，最终获得高硬度兼高韧性、适应冷焊工艺的钢焊缝．

Using Nb,Ti,Zr,V,Re as compound modifying agent to improve the crackresistance ability of the cold welds metal with hardness of HRC55.It is proved by xray,SEM and TEM analysis that as lots of fine carbides separated out first,the network carbides can be restrained to from at crystal boundary.The formation of these fine carbides causes base microstructure of high carbon welds metal to be“Carbon Poor”state,so the base microstructure trans form to be low carbon martensite. A steel welds metal with both high hardness and toughness is obtained by coldweld technology.