Scholarlink

<p>The additive manufacturing of refractory Mo-Re alloys by laser powder bed fusion (L-PBF) remains largely unexplored due to challenges such as uncontrolled porosity and cracking. This study presents a systematic investigation into the L-PBF processability of a Mo-14Re (wt.%) alloy, and establishes a clear processing window and elucidates the pore formation mechanisms. Using high-quality spherical powder, we fabricated samples across a range of volumetric energy densities (VED). Our results demonstrate a non-linear relationship between VED and relative density, identifying a previously unreported optimal VED window of 208-250&#xa0;J/mm<sup>3</sup> that yields high bulk density.&#xa0;A significant finding&#xa0;is that identical VED values from different power–speed combinations result in distinct microstructures and defect populations. Microstructural analysis revealed fine, equiaxed grains with minimal texture, contrasting with the coarse structures typical of conventional processing. This work provides a fundamental insight&#xa0;into the melt pool dynamics and solidification behavior of Mo-Re alloys in L-PBF.</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

The Optimization of Process and Microstructure of Mo-Re Alloy Fabricated by Laser-Powder Bed Fusion

  • 期刊论文

  • 发表日期：

    2026年1月8日

查看全文
  • Xin Zhang,
  • Wenbin Liu,
  • Yichao Yang,
  • Xuanqiao Gao,
  • Li Huang,
  • Wen Zhang

摘要

The additive manufacturing of refractory Mo-Re alloys by laser powder bed fusion (L-PBF) remains largely unexplored due to challenges such as uncontrolled porosity and cracking. This study presents a systematic investigation into the L-PBF processability of a Mo-14Re (wt.%) alloy, and establishes a clear processing window and elucidates the pore formation mechanisms. Using high-quality spherical powder, we fabricated samples across a range of volumetric energy densities (VED). Our results demonstrate a non-linear relationship between VED and relative density, identifying a previously unreported optimal VED window of 208-250 J/mm3 that yields high bulk density. A significant finding is that identical VED values from different power–speed combinations result in distinct microstructures and defect populations. Microstructural analysis revealed fine, equiaxed grains with minimal texture, contrasting with the coarse structures typical of conventional processing. This work provides a fundamental insight into the melt pool dynamics and solidification behavior of Mo-Re alloys in L-PBF.