铸造Ti-Al-Mo-Zr钛合金电子束焊接接头组织与性能

选用电子束焊接方式对14 mm厚铸态Ti-Al-Mo-Zr钛合金进行焊接,在合适的工艺参数下获得成形良好、无内部缺陷的焊接接头。室温下测试与分析焊接接头的显微组织、显微硬度和力学性能,结果显示焊缝处主要由β相基体和粗大的针状α相组成,热影响区处受焊接热循环作用部分转变为网状片层组织。焊缝处硬度略高于母材处,接头整体硬度分布均匀,无明显弱化区域;接头焊缝处抗拉强度优于母材,焊缝处冲击值AKV达到75 J/cm~2,热影响区冲击值为73 J/cm~2,Ti-Al-Mo-Zr钛合金电子束焊接接头冲击韧性良好。

Microstructure and mechanical property of the 14 mm-thickness cast state Ti-Al-Mo-Zr alloy welded joint by the electron beam welding technique

The Ti-Al-Mo-Zr titanium alloy with 14 mm in thickness was welded by the electron beam welding (EBW) technique.A weld joint in good formation with free defects was obtained by the proper welding parameters.The weld joint's microstructure,microhardness and mechanical property were measured at the room temperature.The results show that,in the fusion zone there is mainly a mixture of the β and α structure with coarse needle shape.The structure in the HAZ transformed into basket widmanstaten.The microhardness in the weld seam is slightly higher than that in the base metal.The microhardness is uniformly distributed in the weld joint,which indicates that there is no reduction area in the joint.The tensile strength in the weld joint is higher than that in the base metal The average impact values of the weld seam and the HAZ are75 J/cm2 and 73 J/cm2,the Ti-Al-Mo-Zr alloy joint by the EBW technique has good impact toughness.