大线能量焊接用钢模拟热影响区的组织与性能  

Microstructure and Properties in the Simulation Heat Affected Zone of the Large Heat Input Welding Steel

作　　者：陈颜堂[1] 丁庆丰[1] 刘惟忠[1] 李书瑞[1] 曾静[1] 吴立新[1] 陈晓[1] 

机构地区：[1]武汉钢铁(集团)公司技术中心,湖北武汉430080

出　　处：《金属热处理》2005年第9期19-23,共5页Heat Treatment of Metals

摘　　要：研究了一种低碳低合金600MPa级耐大线能量焊接用钢模拟大线能量输入焊接粗晶热影响区(简称CGHAZ)的微观组织及力学性能。结果表明,大线能量模拟CGHAZ具有优良的强韧性配合(σs≥490MPa,σb≥610MPa,-20℃时AKV≥47 J)。模拟热循环过程中CGHAZ中的高温稳定的复合夹杂物促使针状铁素体的形成,针状铁素体的数量与输入线能量有关。奥氏体和铁素体晶粒大小及针状铁素体数量显著影响焊接粗晶热影响区的力学性能。The mechanical properties and microstructure of the simulated coarse grain heat affected zone （CGHAZ） of a new large heat input welding HSLA steel in 600MPa grade were studied. The results show that the CGHAZ exhibited high strength （σs ≥490MPa,σb ≥610MPa ）, and high impact toughness （ - 20℃ AKV ≥47 J ）. The high temperature stable complex inclusions containing oxides in CGHAZ promote the aeieular ferrite formation during simulated weld thermal cycle. The aeieular ferrite in CGHAZ is a function of heat input. The austenite and ferrite grain size and the amount of aeicular ferrite remarkably affecte the mechanical properties of CGHAZ.

关 键 词：低合金高强钢(HSLA) 大线能量焊接 模拟焊接热影响区 组织 性能 

分 类 号：TG115.5[金属学及工艺—物理冶金]