Scholarlink

<p>Laser-based powder bed fusion (PBF-LB) Ti–6Al–4V alloys typically exhibit high surface roughness and tensile residual stress due to their non-equilibrium <i>α</i>′/<i>β</i> phase structure. In this study, electrochemical polishing (EP) was employed to systematically investigate the correlation between microstructural evolution and residual stress variation. The results show that electrochemical polishing progressively removes the defect-rich surface layer and induces selective dissolution of the <i>α</i>′/<i>β</i> phases, thereby significantly regulating the surface microstructure and stress state. At a polishing time of 9&#xa0;minutes, the surface roughness is reduced by 46.56 pct and the tensile residual stress decreases by 13.8 pct, accompanied by effective alle<i>via</i>tion of lattice distortion. With further polishing to 15&#xa0;minutes, the residual stress transitions from tensile to compressive. This stress inversion is mainly attributed to the preferential dissolution of the <i>β</i> phase and defect-rich regions, which disrupts the martensitic stress-supporting skeleton, triggers lattice elastic rebound, and allows the subsurface compressive stress to dominate. These findings systematically elucidate the specific mechanistic pathways for residual stress regulation in additively manufactured Ti–6Al–4V alloys, providing a comprehensive understanding of the relationship between microstructural evolution and stress inversion.</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

Residual Stress Inversion Driven by Microstructural Evolution in Additively Manufactured Ti–6Al–4V During Electrochemical Polishing

  • 期刊论文

  • 发表日期：

    2026年7月29日

查看全文
  • Yifei Zhang,
  • Yuxuan Yao,
  • Wei Zhou

摘要

Laser-based powder bed fusion (PBF-LB) Ti–6Al–4V alloys typically exhibit high surface roughness and tensile residual stress due to their non-equilibrium α′/β phase structure. In this study, electrochemical polishing (EP) was employed to systematically investigate the correlation between microstructural evolution and residual stress variation. The results show that electrochemical polishing progressively removes the defect-rich surface layer and induces selective dissolution of the α′/β phases, thereby significantly regulating the surface microstructure and stress state. At a polishing time of 9 minutes, the surface roughness is reduced by 46.56 pct and the tensile residual stress decreases by 13.8 pct, accompanied by effective alleviation of lattice distortion. With further polishing to 15 minutes, the residual stress transitions from tensile to compressive. This stress inversion is mainly attributed to the preferential dissolution of the β phase and defect-rich regions, which disrupts the martensitic stress-supporting skeleton, triggers lattice elastic rebound, and allows the subsurface compressive stress to dominate. These findings systematically elucidate the specific mechanistic pathways for residual stress regulation in additively manufactured Ti–6Al–4V alloys, providing a comprehensive understanding of the relationship between microstructural evolution and stress inversion.