33mm厚TC4锻件电子束焊接接头组织与性能  

Structure and Mechanical properties of Welded Joint of 33 mm-thick TC4 Titanium Alloy by Electron Beam Welding Technique

作　　者：刘希林[1] 徐家磊[1] 王莹[1] 耿永亮[1] 王岗[1] 

机构地区：[1]中国船舶重工集团公司第七二五研究所,河南洛阳471023

出　　处：《材料开发与应用》2016年第5期49-52,共4页Development and Application of Materials

摘　　要：对33 mm厚TC4锻件进行了电子束焊接试验,在合适的工艺参数下得到了无内部缺陷、正反面成形良好的接头。室温下对该接头的显微组织、显微硬度和力学性能进行了测试。结果显示,焊缝处、热影响区组织主要是由β转变基体和α'形成的马氏体组织,焊缝处晶粒粗大,热影响区处马氏体细小分布不均;焊缝处硬度略低于母材处硬度,接头整体硬度分布均匀,无明显弱化区域;接头焊缝处屈服强度略低于母材,抗拉强度达到956 MPa,焊缝处冲击值KV2达到56 J,焊缝具有良好的韧性。The electron beam welding technique was used to weld the 33 mm-thick TC4 titanium alloy. A welded joint,in good surface appearance and no internal deflects,was obtained by the proper welding parameters. Microstructures,microhardness and mechanical properties of the joint were investigated at room temperature. Results show that,in the welding seam and the heat affected zone,the martensite structure is composed of β transformation and the α’. The grains in the welding seam are relatively coarse,while in the HAZ,the grains are fine and uneven distributed. The microhardness in the welding seam is slightly lower than that in the base metal,and the microhardness is uniform in the welded joint,indicating there is no weakened area in the joint. The tensile strength is up to 956 MPa,and the average impact value of the welded metal reaches to 56 J,showing an excellent toughness in the seam.

关 键 词：电子束焊接 TC4钛合金 接头组织 力学性能 

分 类 号：TG174.2[金属学及工艺—金属表面处理]