新型Ti-Al-Cr-Mo-Zr钛合金焊丝激光焊接头组织性能  

Microstructure and Properties of Laser Welded Joints of New Ti-Al-Cr-Mo-Zr Titanium Alloy Welding Wire

作　　者：方乃文[1,2] 冯志强 武鹏博 黄瑞生 罗玖田[2] 黎泉 信国松 Fang Naiwen;Feng Zhiqiang;Wu Pengbo;Huang Ruisheng;Luo Jiutian;Li Quan;Xin Guosong(Harbin Welding Institute Limited Company,Harbin 150028,China;Beibu Gulf University,Qinzhou 535011,China;Juli New Material Technology(Rizhao)Co.,Ltd,Rizhao 276826,China)

机构地区：[1]中国机械总院集团哈尔滨焊接研究所有限公司,黑龙江哈尔滨150028 [2]北部湾大学,广西钦州535011 [3]聚力新材料科技(日照)有限公司,山东日照276826

出　　处：《稀有金属材料与工程》2025年第1期147-155,共9页Rare Metal Materials and Engineering

基　　金：国家重点研发计划(2021YFB3401100);国家自然科学基金(52261044);泰山产业领军人才工程专项经费(2024001)。

摘　　要：通过优化Cr-Mo-Zr的协同作用机制开发了钛合金实心焊丝,选择具有均匀的熔滴受力状态、稳定的熔滴过渡形式的液桥过渡进行激光填丝焊,最终实现了20 mm厚Ti64钛合金板的优质焊接。经过观察和测试发现Ti-Al-Cr-Mo-Zr钛合金实心焊丝具有足够的挺度和松弛度,为后续的激光填丝焊接时光束与焊丝所需的精准对中和稳定送丝提供了保障;焊缝中大于10°的大角度晶界占比为97.8%,几何必要位错密度较低,小尺寸晶粒的占比较大,焊缝表现出总体取向性不强,织构不明显且分布随机,最大基面取向密度仅为12.66;焊接接头的平均抗拉强度为901 MPa,平均断后伸长率为21%,室温冲击韧性分布在29~33 J之间。自主开发设计的Ti-Al-Cr-Mo-Zr系钛合金实心焊丝对于获得强度和塑韧性协同优化的焊接接头具有重要的作用,为钛合金焊接结构长期安全服役提供了基础技术支撑。Titanium alloy solid welding wire was developed by optimizing the synergistic mechanism of Cr-Mo-Zr.The liquid bridge transition with uniform droplet stress and stable droplet transition was selected for laser wire filling welding.Finally,the high quality welding of 20 mm thick Ti64 titanium alloy plate was realized.Results show that Ti-Al-Cr-Mo-Zr titanium alloy solid welding wire has enough stiffness and relaxation,which provides a guarantee for the accurate alignment between the beam and the welding wire,and stable wire feed during the subsequent laser wire filling welding.In the welded seam,the proportion of large-angle grain boundaries greater than 10°is 97.8%,the geometrically necessary dislocation density is low,and the proportion of small size grains is relatively large.The overall orientation of the welded seam is not strong,the texture is not obvious and the distribution is random,and the maximum multiples of uniform distribution is only 12.66.The average tensile strength of welded joints is 901 MPa,the average elongation is 21%,and the impact toughness at room temperature ranges from 29 J to 33 J.The self-developed and designed Ti-Al-Cr-Mo-Zr titanium alloy solid welding wire plays an important role in obtaining welded joints with synergistic optimization of strength and plasticity-toughness,and provides basic technical support for the long-term safe service of titanium alloy welding structures.

关 键 词：钛合金 Ti-Al-Cr-Mo-Zr焊丝 组织性能 

分 类 号：TG457.1[金属学及工艺—焊接]