Scholarlink

<p>Additively manufactured (AM) AISI 316L produced by laser powder bed fusion (LPBF) often suffers from poor surface integrity, including pores, tensile residual stresses, and surface roughness, which limit its structural performance in load-bearing applications. In this study, ultrasonic-assisted burnishing (UAB) was investigated as a post-processing method to enhance the fatigue and stress–strain behavior of LPBF-built 316L. A response surface design was employed to evaluate the influence of vibration amplitude, static force, feed rate, and spindle speed on ultimate tensile strength (UTS), elongation, and low-cycle fatigue life. The optimized parameters (30&#xa0;μm amplitude, 400 N force, 300 RPM spindle speed, and 0.05&#xa0;mm feed rate) yielded significant improvements compared with the as-built condition, with UTS increased by 35%, ductility by 90%, and fatigue life by 84%. These enhancements were attributed to improved surface integrity, including reduced roughness and porosity, compressive residual stresses, and refined microstructure induced by the UAB process.</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

Ultrasonic-Assisted Burnishing for Structural Integrity Enhancement of AISI 316 L Additive Manufactured by Laser Powder Bed Fusion

  • 期刊论文

  • 发表日期：

    2025年11月10日

查看全文
  • Naif Alharbi

摘要

Additively manufactured (AM) AISI 316L produced by laser powder bed fusion (LPBF) often suffers from poor surface integrity, including pores, tensile residual stresses, and surface roughness, which limit its structural performance in load-bearing applications. In this study, ultrasonic-assisted burnishing (UAB) was investigated as a post-processing method to enhance the fatigue and stress–strain behavior of LPBF-built 316L. A response surface design was employed to evaluate the influence of vibration amplitude, static force, feed rate, and spindle speed on ultimate tensile strength (UTS), elongation, and low-cycle fatigue life. The optimized parameters (30 μm amplitude, 400 N force, 300 RPM spindle speed, and 0.05 mm feed rate) yielded significant improvements compared with the as-built condition, with UTS increased by 35%, ductility by 90%, and fatigue life by 84%. These enhancements were attributed to improved surface integrity, including reduced roughness and porosity, compressive residual stresses, and refined microstructure induced by the UAB process.