HQ130钢焊接熔合区的裂纹形态  

Study on Cracking Propagation Morphology of HQ130 Steel in the Fusion Zone

作　　者：邹增大[1] 李亚江[1] 

机构地区：[1]山东工业大学材料科学与工程学院,济南250061

出　　处：《钢铁研究学报》1999年第6期43-47,共5页Journal of Iron and Steel Research

基　　金：山东省博士基金

摘　　要：通过抗裂性试验对ＨＱ１３０高强钢焊接熔合区附近裂纹的产生及扩展行为进行了研究，结合超声波探测、金相和扫描电镜（ＳＥＭ）观察对裂纹形态进行了分析。试验结果表明，ＨＱ１３０ 钢焊接裂纹大多起源于距熔化边界线２０～６０ μｍ 的半熔化区，一般平行于熔合区扩展或越过熔合区拐向焊缝。采用“低强匹配”焊材可提高焊缝金属的韧性储备，缓解熔合区附近的应力集中，有利于防止焊接冷裂纹的产生。The crack production and propagation of HQ130 high strength steel in the fusion zone were studied by the cracking susceptibility test. The crack morphology in the welding zone was analyzed by means of ultrasonic wave survey, microscope and SEM. Experimental test indicated that welding crack commonly produced in the partially melted zone which has 20～60 μm distance to the melting line and propagated in parallel with the fusion zone or turned into the weld metal. Using “low strength match” welding material, the toughness reserve in the weld metal can be increased, the stress concentration in the fusion zone can be relaxed, and the welding cold crack can be effectively prevented.

关 键 词：高强钢 焊接 熔合区 冷裂纹 

分 类 号：TG457.11[金属学及工艺—焊接] TG404