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<p>Cracking and crystallographic texture are critical factors affecting the mechanical performance of additive manufactured non-weldable nickel alloys during long-term service. This study systematically investigates the effects of laser powder bed fusion (LPBF) parameters including scanning speed, rotation strategy, layer thickness, and hatch distance on grain boundary characteristics and crack formation mechanisms. Through comprehensive microstructural characterization and statistical analysis, we demonstrate that optimized parameters achieving a low ratio of low-angle grain boundaries (LAGBs, &lt; 10°) significantly reduce crack density by 62% compared to conventional processing conditions. The synergistic effect of controlled remelting cycles and epitaxial grain growth modification was found to suppress solidification cracking while maintaining strong &lt; 100 &gt; texture along the building direction. These findings provide new insights into defect mitigation strategies for high-performance superalloy additive manufacturing.</p>

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Cracking Reduction and Texture Control in Laser Powder Bed Fusion Additive Manufactured Non-weldable Nickel Alloy

  • 期刊论文

  • 发表日期：

    2025年6月16日

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  • Wenhu Lin,
  • Zhenbo Zhang

摘要

Cracking and crystallographic texture are critical factors affecting the mechanical performance of additive manufactured non-weldable nickel alloys during long-term service. This study systematically investigates the effects of laser powder bed fusion (LPBF) parameters including scanning speed, rotation strategy, layer thickness, and hatch distance on grain boundary characteristics and crack formation mechanisms. Through comprehensive microstructural characterization and statistical analysis, we demonstrate that optimized parameters achieving a low ratio of low-angle grain boundaries (LAGBs, < 10°) significantly reduce crack density by 62% compared to conventional processing conditions. The synergistic effect of controlled remelting cycles and epitaxial grain growth modification was found to suppress solidification cracking while maintaining strong < 100 > texture along the building direction. These findings provide new insights into defect mitigation strategies for high-performance superalloy additive manufacturing.