A-100钢电子束焊缝力学性能及微观组织  

Mechanical properties and microstructure of electron beam weld of A-100 steel

作　　者：高峰[1] 黄成杰 关峰[1] 刘艳梅[1] 崔洋 Gao Feng;Huang Chengjie;Guan Feng;Liu Yanmei;Cui Yang(Shenyang Aircraft Industry(Group)Co.,Ltd.,Shenyang 110034,China)

机构地区：[1]沈阳飞机工业(集团)有限公司,沈阳110034

出　　处：《焊接》2022年第9期60-64,共5页Welding & Joining

摘　　要：采用电子束焊实现23Co14Ni12Cr3MoE超高强度钢(A-100钢)的连接。研究电子束焊对A-100钢力学性能及组织影响。结果表明,采用电子束直接熔化A-100钢锻件进行热处理(气淬)后的焊缝组织主要为板条状马氏体,且彼此位向交错分布成网篮状。焊缝组织呈现一定的不均匀性,中间的马氏体更为粗大,且残余奥氏体较少,热影响区残余奥氏体增多,存在大量薄膜状逆转奥氏体。A-100钢电子束焊缝与基体相比强度和塑性基本相当。焊缝和热影响区的缺口敏感性都较小,缺口敏感系数约为0.6。焊缝的冲击韧性下降到基体的2/3,但热影响区的冲击韧性回升到基体的80%以上。焊缝的高周疲劳极限可以达到700 MPa以上,焊缝具有较好的疲劳性能。Electron beam welding of 23Co14Ni12Cr3MoE ultra-high strength steel(A-100 steel)was realized.Effect of electron beam welding on mechanical properties and microstructure of A-100 steel was studied.The result showed that after heat treatment(gas quenching),microstructure of A-100 steel forgings’weld directly melted by electron beam was mainly lath martensite,which was staggered and distributed into basket shape.Microstructure of weld presented a certain degree of non-uniform,martensite in the middle was coarser,residual austenite was less.Residual austenite in heat affected zone increased and there was a large number of thin film reverse austenite.Strength and plasticity of electron beam weld of A-100 steel were basically equivalent to those of matrix.Notch sensitivity of weld and heat affected zone was small and notch sensitivity coefficient was about 0.6.Impact toughness of weld decreased to 2/3 of matrix,while impact toughness of heat affected zone rise to more than 80%of matrix.High cycle fatigue limit of weld could reach more than 700 MPa and weld had good fatigue properties.

关 键 词：高压电子束焊 超高强度钢 A-100钢 力学性能 

分 类 号：TG456.3[金属学及工艺—焊接]