摘要
采用光纤激光焊对TA15钛合金进行无间隙对接焊,选取6组不同的超声冲击处理时间对焊接接头显微组织、力学性能、晶粒尺寸、应力分布和粗糙度进行研究,确定较优的超声冲击处理时间。结果表明,当冲击电流为1.2 A、频率为20 kHz、冲击时间为75 min时,可获得30~50μm厚的致密强化层,103.4 nm的晶粒尺寸,其粗糙度为34.13μm。经过超声冲击处理后,减少了气孔、缩松等缺陷,使得拉应力转变为压应力,接头的应力集中得到极大地改善,对钛合金材料组织和性能的提高有积极的促进作用。
No-gap butt welding of TA15 titanium alloy by fiber laser welding,6 different ultrasonic impact treatment times were selected to study the microstructure,mechanical properties,grain size and stress distribution of the welded joints,and the optimal ultrasonic impact treatment time was determined.The results show that when the impact current is 1.2 A,the frequency is 20 kHz,and the impact time is 75 min,a dense strengthening layer of 30-50μm thickness,a grain size of 103.4 nm,and a roughness of 34.13μm can be obtained.After ultrasonic impact treatment,the defects such as porosity and shrinkage porosity are reduced,and the tensile stress is transformed into compressive stress.The stress concentration of the welded joint is greatly improved,the hardness of the weld is increased and the distribution is relatively uniform,and microstructure and properties of titanium alloy are improved.
作者
宿月
陈芙蓉
张博友
Su Yue;Chen Furong;Zhang Boyou(College of Materials Science and Engineering,Inner Mongolia University of Technology,Hohhot 010051,China)
出处
《机械制造文摘（焊接分册）》
2020年第1期8-12,共5页
Welding Digest of Machinery Manufacturing
基金
内蒙古工业大学大学生创新实验计划项目(2018055)。
关键词
光纤激光焊
超声冲击处理
晶粒尺寸
应力分布
fiber laser welding
ultrasonic impact treatment
grain size
stress distribution
