钼合金与低合金钢电子束焊接的力学性能研究  

Study on Mechanical Properties of Electron Beam Welding of Molybdenum Alloy and Low Alloy Steel

作　　者：王志洪 熊星 石林 陶宇 夏刚强 WANG Zhi-hong;XIONG Xing;SHI Lin;TAO Yu;XIA Gang-qiang(The 52nd Research Institute of China Electronics Technology Group Corporation,Hangzhou 311122)

机构地区：[1]中国电子科技集团公司第五十二研究所,杭州311122

出　　处：《环境技术》2024年第6期195-199,共5页Environmental Technology

摘　　要：对TZM钼合金与30CrMnSi低合金高强钢进行电子束焊接试验,分析了焊接接头微观组织、界面结构以及接头力学性能。结果表明,束流偏向钢侧0.2 mm时,形成熔钎焊接头形式。在钼侧熔合线附近产生的界面区根据组织形貌与相组成划分为反应层Ⅰ与反应层Ⅱ,结合能谱、线扫描分析和XRD分析表明反应层Ⅰ由连续分布的Fe2Mo相构成,会显著影响接头力学性能。拉伸结果表明,断裂沿反应层Ⅰ位置处扩展,呈现出脆性断裂特征,极限拉伸强度为209 MPa。显微硬度结果显示,沿水平方向接头不同特征区域硬度值差异较大,存在针状马氏体的钢侧热影响区显微硬度值最高,达到687 HV。Electron beam welding was used to join 30CrMnSi low alloy and high strength steel to TZM molybdenum alloy.The microstructure,interface structure and mechanical properties of the welded joint were analyzed.The results indicated that during welding with a 0.2mm beam deflection to steel,the joint was a typical melt-brazed joint.The interface region along the fusion line on the molybdenum side was divided into reaction layer I and reaction layer II according to the microstructure and phase composition.Point energy spectrum,line scanning element and analysis and XRD analysis showed that the reaction layer I was mainly composed of continuous Fe2Mo intermetallic compounds,which was the key factor affecting the joint performance.The tensile results indicated that the fracture position was located on the side of reaction layer I close to molybdenum alloy,which was a typical brittle fracture,and the tensile strength of the joint was 209 MPa.There were obvious differences in the hardness values of the different micro characteristic regions of the welded joint along the horizontal direction,and the microhardness value of the heat affected zone on the steel side with acicular martensite was the highest,reaching 687 HV.

关 键 词：电子束焊接 钼合金 高强钢 化合物层 力学性能 

分 类 号：TG456.3[金属学及工艺—焊接]