夹杂物与氢对15MnVN_q(C,B)钢对接接头冷弯性能的影响  

Effect of inclusions and hydrogen on cold bending property of 15MnVN_q(C、B) steel butt welded joint

作　　者：江崇华 周昭伟[1] 葛学廉[1] 

机构地区：[1]哈尔滨焊接研究所

出　　处：《焊接学报》1993年第2期104-110,共7页Transactions of The China Welding Institution

摘　　要：本文对15MnVN_q(C、B)钢对接接头含裂纹冷弯试件进行了扫描电子显微镜断口、微区化学成分分析试验,金相检验,残余氢测定、去氢处理等相关试验,探讨了冷弯试件中裂纹形成的原因,提出15MnVN_q(C、B)钢对接接头冷弯试件表面裂纹形成的内在因素是母材中条(片)状夹杂物的存在,外部因素是由各种原因所引起的氢在夹杂物周围的富集;该类裂纹性质属内部氢脆,并可望对钢材的冶炼工艺进一步改善后减少夹杂物数量和改变夹杂物形状而避免。The cracked cold bending specimens of 15MnVN_(?)(C、B) steel butt welded joint were analyzed with SEM technology, energy spectrum, metalographic examination, and the detection of residual hydrogen content. The removal of hydrogen from the test piece was also done to study the cause of cracking in cold bending specimens. It was proposed that the internal factor to cause the formation of crack near the surface of cold bending specimens is the presence of stripped/flaked inclusions in the base metal, the external factor is the accumulation of hydrogen around the inclusions caused by various factors. The crack is one kind of internal hydrogen embrittlcmcnt, and may be avoided by the reduction of the amount and characteristics of inclusions through further improvement of metallurgical processes.

关 键 词：桥梁钢 对接接头 夹杂 氢 冷弯性能 

分 类 号：TG407[金属学及工艺—焊接]