Scholarlink

<p>TC4ELI titanium alloy is used extensively in marine engineering, shipbuilding, and other fields thanks to its high strength, good toughness, and excellent corrosion resistance. This paper explores laser-MIG hybrid welding of 12.5&#xa0;mm thick TC4ELI titanium alloy. Traditional welding methods have a large heat-affected zone and generate significant residual stress. To address these issues, ultrasonic impact treatment is used to regulate the residual stress and microstructure properties of the welded joint, enabling regulation of microstructure, stress, and properties. The study shows that the “blind-hole method” residual stress tests indicate that ultrasonic impact can transform the surface residual stress from tensile to compressive. It also refines the needle-like α’-martensite structure and removes some micro-defects. After ultrasonic treatment, the joint’s tensile strength increases from 1156 to 1195&#xa0;MPa, and the impact toughness rises from 27&#xa0;J/cm<sup>2</sup> to 36&#xa0;J/cm<sup>2</sup>. Additionally, the microhardness is enhanced, showing that ultrasonic impact improves the mechanical properties of the joint.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Effects of ultrasonic impact treatment on residual stress and microstructure in laser-MIG hybrid welded TC4ELI titanium alloy

  • 期刊论文

  • 发表日期：

    2026年3月10日

查看全文
  • Shu Liu,
  • Zhenyu Liu,
  • Deyang Zhang,
  • Jun Wang,
  • Feiyun Wang,
  • Yong Zhao,
  • Juan Fu

摘要

TC4ELI titanium alloy is used extensively in marine engineering, shipbuilding, and other fields thanks to its high strength, good toughness, and excellent corrosion resistance. This paper explores laser-MIG hybrid welding of 12.5 mm thick TC4ELI titanium alloy. Traditional welding methods have a large heat-affected zone and generate significant residual stress. To address these issues, ultrasonic impact treatment is used to regulate the residual stress and microstructure properties of the welded joint, enabling regulation of microstructure, stress, and properties. The study shows that the “blind-hole method” residual stress tests indicate that ultrasonic impact can transform the surface residual stress from tensile to compressive. It also refines the needle-like α’-martensite structure and removes some micro-defects. After ultrasonic treatment, the joint’s tensile strength increases from 1156 to 1195 MPa, and the impact toughness rises from 27 J/cm2 to 36 J/cm2. Additionally, the microhardness is enhanced, showing that ultrasonic impact improves the mechanical properties of the joint.