600MPa级超细晶粒钢摩擦焊过程性能分析  

Microstructure and properties of joints of 600 MPa grade ultrafine grained steel obtained by friction welding

作　　者：冯涛[1] 郁振其[2] 刘永华[3] 李思[1] 王引真[1] 

机构地区：[1]中国石油大学(华东)机电学院,青岛266580 [2]中国石油天然气管道局国内事业部,廊坊065000 [3]中国机械工程学会,北京100048

出　　处：《焊接学报》2015年第3期85-88,5,共5页Transactions of The China Welding Institution

基　　金：山东省科技发展计划资助项目(2014GGX103013);中央高校基本科研费业务资金专项资金资助项目(11CX04038A;13CX02069A)

摘　　要：利用摩擦焊对直径为13 mm的600 MPa级别的超细晶粒钢进行了焊接.结果表明,严格控制摩擦焊工艺参数,超细晶粒钢具有良好的摩擦焊焊接性.超细晶粒钢摩擦焊接头热影响区出现了轻微的晶粒长大,尺寸至9~11μm.接头性能分析表明,超细晶粒钢摩擦焊接头强度可达715 MPa,断面伸长率22%,断面收缩率68%,冲击韧性可达98 J,呈典型的韧性断裂.急停试验表明,摩擦焊过程中变形区金属在摩擦扭矩和轴向压力大作用下,沿着轴向、切向、径向三个方向流动.随摩擦时间的增加,不同区域的晶粒的尺寸都略有增加,其中以高温区增加最为明显.13mm diameter bars of 600 MPa grade ultrafine grain steel were welded by friction welding. Experimental results show that ultra-fine grain steel has good weldability of friction welding when the friction welding process parameters were properly controlled. Ultra-fine grain steel friction welding joint was mainly composed of four zones: welding seam,thermo-mechanically affected zone( TMAZ),heat affected zone( HAZ)and base material. The grain size was about 9- 11 μm in the HAZ,which was slightly larger than the one of the base metal.Mechanical properties results showed that joint strength of the ultrafine-grained steel friction welding was up to 715 MPa with22% elongation and 68% contraction ratio of cross section,and impact toughness was about 98 J. Meanwhile typical ductile fracture was obtained for this kind of joint.

关 键 词：超细晶粒钢 摩擦焊 接头组织 性能 

分 类 号：TG453.9[金属学及工艺—焊接]