Scholarlink

<p>Understanding mechanisms of defect formation in both virgin and recycled powders during laser additive manufacturing and subsequent welding is crucial for producing high-quality components. This study presents a comparative analysis of three AlSi10Mg powders: virgin powder (VP), recycled powder (RP), and environmentally aged powder (EP). Results show that EP contains 4.43 times higher hydrogen and 33.93 times higher oxygen compared to VP, along with a thickened surface oxide layer of 9.65 nm. AlSi10Mg sheets (3 mm in thickness) were fabricated via laser powder bed fusion (LPBF) using different powders and were subsequently welded by gas tungsten arc welding (GTAW). Elevated hydrogen and oxygen contents promoted powder coarsening and agglomeration, reducing effective laser energy density during LPBF and increasing porosity in as-built samples from 0.82 to 18.24%. The deterioration in substrate quality further raised weld porosity from 5.7 to 28.5%. Lower hydrogen/oxygen contents reduced porosity, refined grains, and improved the morphology of the Si-rich eutectic phase. The results indicated that joints from EP exhibited lower mechanical properties than those from VP and RP. The enhanced strength of the weld joints is attributed to the combined effects of reduced porosity, enhanced solid solution strengthening from dissolved silicon, and grain refinement.</p> Graphical abstract <p></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

Controlling weld quality in additively manufactured AlSi10Mg: comparing virgin, recycled, and aged powders

  • 期刊论文

  • 发表日期：

    2026年4月1日

查看全文
  • Xiang Li,
  • Bohan Shen,
  • Can Wang,
  • Li Cui,
  • Xingye Guo,
  • Xu Wu,
  • Dingyong He

摘要

Understanding mechanisms of defect formation in both virgin and recycled powders during laser additive manufacturing and subsequent welding is crucial for producing high-quality components. This study presents a comparative analysis of three AlSi10Mg powders: virgin powder (VP), recycled powder (RP), and environmentally aged powder (EP). Results show that EP contains 4.43 times higher hydrogen and 33.93 times higher oxygen compared to VP, along with a thickened surface oxide layer of 9.65 nm. AlSi10Mg sheets (3 mm in thickness) were fabricated via laser powder bed fusion (LPBF) using different powders and were subsequently welded by gas tungsten arc welding (GTAW). Elevated hydrogen and oxygen contents promoted powder coarsening and agglomeration, reducing effective laser energy density during LPBF and increasing porosity in as-built samples from 0.82 to 18.24%. The deterioration in substrate quality further raised weld porosity from 5.7 to 28.5%. Lower hydrogen/oxygen contents reduced porosity, refined grains, and improved the morphology of the Si-rich eutectic phase. The results indicated that joints from EP exhibited lower mechanical properties than those from VP and RP. The enhanced strength of the weld joints is attributed to the combined effects of reduced porosity, enhanced solid solution strengthening from dissolved silicon, and grain refinement.

Graphical abstract