JFE980S高强钢焊接接头软化分析  

Analysis on joint softening for JFE980S high strength steel

作　　者：雷振[1] 王旭友[1] 滕彬[1] 郑红阳[2] 

机构地区：[1]机械科学研究院哈尔滨焊接研究所,哈尔滨150080 [2]黑龙江省建筑设计研究院,哈尔滨150008

出　　处：《焊接学报》2010年第11期33-37,共5页Transactions of The China Welding Institution

基　　金：国家"十一五"科技支撑计划项目(2006BAF04B10)

摘　　要：研究了激光-MAG复合热源和常规MAG两种焊接方法在焊接JFE980S低合金调质高强钢时的接头软化问题.通过对接头强度、硬度和组织的测试分析,探讨了低合金调质高强钢焊接接头的软化规律及机制.结果表明,焊后JFE980S高强钢常规MAG焊接头发生了明显软化,而激光-MAG复合热源焊接接头软化不明显;激光-MAG复合热源焊接接头的软化区域宽度和软化程度明显小于常规MAG焊接头;接头的软化主要发生在焊接热影响区的过回火区域和不完全正火区域,该区域中出现沿晶界呈块状或颗粒状分布的组织是造成接头软化的主要原因.The softening problems in the joints of low alloy high strength steel JFE980S by laser-MAG hybrid welding and MAG welding were studied.The softening law and mechanism for the quenched and tempered low alloy high strength steel joints were discussed according to the results of tensile test,hardness test and microstructure analysis.The result indicated that the joints by MAG welding are seriously softened,but the joints by laser-MAG hybrid welding only are softened a little.And the softened zone width and the softened degree of the joints by laser-MAG hybrid welding are both smaller and lower than those of the joints by MAG welding.The softening mainly appears in over-tempering zone and incomplete normalizing zone in the HAZ.And the distribution of granular or nubbly microstructure along the grain boundaries is the main reason of the softening.

关 键 词：低合金调质高强钢 接头软化 激光 MAG电弧 复合热源 

分 类 号：TG156[金属学及工艺—热处理]