手工自蔓延立焊Q235钢接头冲击韧性与断口微观形貌  

Impact Toughness and Fracture Microstructure of Welded Joints of Q235 Alloy by Manual Self-propagating High-temperature Synthesis Vertical Welding

作　　者：吴永胜[1] 王建江[1] 辛文彤[1] 曲立峰 万国顺[3] 

机构地区：[1]军械工程学院先进材料研究所,河北石家庄050003 [2]重庆军事代表局驻167厂军事代表室,四川成都610110 [3]中国人民解放军驻743厂军事代表室,山西太原030027

出　　处：《热加工工艺》2014年第1期219-220,222,共3页Hot Working Technology

摘　　要：以Q235钢为母材进行手工自蔓延立焊,对其接头的冲击韧性进行了测试,采用SEM观察分析了其断口形貌。结果表明,手工自蔓延立焊所得焊接接头冲击韧度约为11.29 J/cm2。断口分析发现解理台阶、小韧窝及撕裂岭存在,试样的断裂是解理断裂和准解理断裂等多种断裂方式共存的混合断裂方式。分析断口发现,焊缝中存在一定缺陷,并成为断裂的裂纹源,使得接头冲击韧性低。The base metal of Q235 was welded by manual self-propagating high-temperature synthesis （SHS） vertical weld, The microstructure and fracture of the welded joints were studied by impact toughness testing and SEM. The results show that impact toughness of the welded joint is 11.29 J/cm2. The equiaxed dimple of fineness, cleavage stage and tear ridge are presented in the fracture of weld alloy zone. The fracture of impact toughness testing is the mix mode of cleavage fracture and quasi-cleavage fracture. The weld defects can be found in the weld alloy by the analysis of fracture ,which is the source of crack, It can weaken the impact toughness of the welded joints.

关 键 词：自蔓延立焊 冲击韧性 断口 

分 类 号：TG456[金属学及工艺—焊接]