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Multi-material structures fabricated by laser powder bed fusion (LPBF) are potentially applied in aerospace, nuclear energy and other industrial fields because of its diversified functions/performance. However, different thermophysical properties (melting point, thermal expansivity, etc.) of dissimilar materials may lead to strain mismatch at the interface and resulting in defects (cracks and pores, etc.). In this work, an in-situ strain measuring system was designed to record the in-situ strain behavior during the LPBF-processed IN718/Ti6Al4V multi-material structures. The strain generation and evolution behavior of multi-material structures in LPBF process were discussed. After laser scanning, the parts first showed a tendency to bend in the opposite direction of building direction, finally appeared to bend in the building direction. The effects of CuCrZr interlayer on the interfacial strain behavior of IN718/Ti6Al4V multi-material structure were investigated. It was found that the interface of IN718/CuCrZr/Ti6Al4V multi-material structures can achieve a good bonding by introducing an intermediate bonding layer CuCrZr.

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Interfacial Strain Behavior of Multi-material Structures Fabricated by Laser Powder Bed Fusion

  • 会议论文

  • 发表日期：

    2025年

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  • Di Wang,
  • Yang Li,
  • Linqing Liu,
  • Jinrong Tang,
  • Yongqiang Yang,
  • Changjun Han

摘要

Multi-material structures fabricated by laser powder bed fusion (LPBF) are potentially applied in aerospace, nuclear energy and other industrial fields because of its diversified functions/performance. However, different thermophysical properties (melting point, thermal expansivity, etc.) of dissimilar materials may lead to strain mismatch at the interface and resulting in defects (cracks and pores, etc.). In this work, an in-situ strain measuring system was designed to record the in-situ strain behavior during the LPBF-processed IN718/Ti6Al4V multi-material structures. The strain generation and evolution behavior of multi-material structures in LPBF process were discussed. After laser scanning, the parts first showed a tendency to bend in the opposite direction of building direction, finally appeared to bend in the building direction. The effects of CuCrZr interlayer on the interfacial strain behavior of IN718/Ti6Al4V multi-material structure were investigated. It was found that the interface of IN718/CuCrZr/Ti6Al4V multi-material structures can achieve a good bonding by introducing an intermediate bonding layer CuCrZr.