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真空 ›› 2020, Vol. 57 ›› Issue (4): 89-94.doi: 10.13385/j.cnki.vacuum.2020.04.18

• 3D打印技术 • 上一篇    下一篇

TC4薄壁钛合金激光对接接头组织及力学性能研究*

赵兴旺, 刘艳梅, 付和国, 史吉鹏, 关峰   

  1. 沈阳飞机工业（集团）有限公司,辽宁 沈阳 110013
  • 收稿日期:2020-02-25 出版日期:2020-07-25 发布日期:2020-07-23
  • 作者简介:赵兴旺（1986-）,男,辽宁省本溪市人,本科,工程师。
  • 基金资助:
    *国防基础科研资助（JCKY2018205B023）

Research on Microstructure and Mechanical Properties of Laser Butt Welding of Thin TC4 Titanium Alloy

ZHAO Xing-wang, LIU Yan-mei, FU He-guo, SHI Ji-peng, GUAN Feng   

  1. Avic Shenyang Aircraft Corporation, Shenyang 110013, China
  • Received:2020-02-25 Online:2020-07-25 Published:2020-07-23

摘要： 针对航空钛合金结构件使用环境受力复杂的特点,本论文以最广泛应用的厚度为1.0mm与2.0mmTC4薄壁钛合金结构的激光焊接技术为研究对象,从焊接工艺角度出发,优化了焊接工艺参数,测试了接头的剪切性能、抗拉性能以及弯曲性能,为了进一步分析所测得的力学性能结果,分别采用X光与SEM对接头的内部质量与组织进行观察。结果显示：采用优化后的工艺参数可以获得性能良好且各项指标均满足航空标准I级焊缝要求的激光焊接接头,这主要是由于激光焊接熔池温度梯度大、冷却速度快,接头组织主要为网篮状分布微小的针状马氏体,提高了接头的塑性与高温持久强度。

关键词: TC4, 激光焊, 组织, 力学性能

Abstract: Aiming at the characteristics of the complex mechanical in actual environment of aviation titanium alloy structural parts, the most widely used laser welding of 1.0mm and 2.0mm TC4 thin-walled titanium alloy were taken as the research object in this paper. From the perspective of welding process, the welding process parameters were optimized, the shear performance were tested, as well as tensile performance and bending performance of the joint. In order to further analyze the as-measured mechanical performance results, X-ray and SEM were used to observe the internal quality and microstructure. The results show that laser welding joints with good performance can be obtained using the optimized process parameters, and all indicators of the joint meet the requirements of aviation standard level Ⅰ. This is mainly due to the large temperature gradient and fast cooling speed of the laser welding molten pool, the joint microstructure is mainly composed of tiny needle-shaped martensite distributed in a basket shape that improves the plasticity of the joint and the high temperature endurance strength.

Key words: TC4, lasew welding, microstructure, mechanical properties

中图分类号: 

  • TG457
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