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<p>The laser powder bed fusion (LPBF) process enables the production of net-shaped, intricate metal components. However, commercial LPBF machines are typically designed to handle a single type of metal powder. This study evaluates the integration of a cost-effective, detachable powder dispensing and removal system that can be added to a commercial LPBF printer, enabling the research in multi-material LPBF. The proposed system is capable of dispensing two or more metal powders during the recoating process, opening up new opportunities for functional grading in LPBF parts. Crack-free SS316L-IN718 bimetallic specimens were fabricated to demonstrate the capability of an in-house modified LPBF system. We characterize the melt pool geometry, grain size, composition, and microhardness of the interface. The results show that a simple modification in the powder dispensing system can incorporate dissimilar metals in LPBF and fabricate parts with good metallurgical bonding. The capabilities and limitations of the new system are compared with the existing multi-material LPBF systems.</p>

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Cost-effective and adaptable lab-scale multi-material system for LPBF

  • 期刊论文

  • 发表日期：

    2025年4月9日

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  • Bharath Bhushan Ravichander,
  • Shweta Hanmant Jagdale,
  • Golden Kumar

摘要

The laser powder bed fusion (LPBF) process enables the production of net-shaped, intricate metal components. However, commercial LPBF machines are typically designed to handle a single type of metal powder. This study evaluates the integration of a cost-effective, detachable powder dispensing and removal system that can be added to a commercial LPBF printer, enabling the research in multi-material LPBF. The proposed system is capable of dispensing two or more metal powders during the recoating process, opening up new opportunities for functional grading in LPBF parts. Crack-free SS316L-IN718 bimetallic specimens were fabricated to demonstrate the capability of an in-house modified LPBF system. We characterize the melt pool geometry, grain size, composition, and microhardness of the interface. The results show that a simple modification in the powder dispensing system can incorporate dissimilar metals in LPBF and fabricate parts with good metallurgical bonding. The capabilities and limitations of the new system are compared with the existing multi-material LPBF systems.