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<p>The laser powder bed fusion (LPBF) technology is employed to manufacture the 316L-CuCrZr bi-material. The microstructure characteristics of 316L-CuCrZr gradient specimen including grain size, element distribution, and precipitate phase were analyzed. Lots of Fe-rich and Cu-rich phases with different shapes are found at the interface zone of 316L steel and LPBF-printed CuCuZr alloy, which indicates that sufficient element diffusion was occurred. The ε-Cu, γ-Fe and Cr phases are also identified by selected area electron diffraction (SAED). Furthermore, due to the synergistic effect of fine grain strengthening, precipitation strengthening, and heterostructure, the LPBF-fabricated 316L-CuCrZr interface with excellent joining strength is obtained. The specimen prepared with 450 W-400&#xa0;mm/s exhibits excellent mechanical performance (the ultimate tensile strength: 290&#xa0;MPa; the yield strength: 208&#xa0;MPa; the elongation: 20%). After aging treated at 450&#xa0;℃ for 2&#xa0;h, the ultimate tensile strength and yield strength of the specimen reached 521&#xa0;MPa and 434&#xa0;MPa, respectively. This research can provide some reasonable suggestions and guidance for preparing multi-material structures.</p>

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Microstructure, mechanical properties, and interface strengthening mechanisms of LPBF-fabricated 316L-CuCrZr dissimilar materials

  • 期刊论文

  • 发表日期：

    2025年7月14日

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  • Jiang Bi,
  • Jinliang Zou,
  • Liangjin Zhu,
  • Liukun Wu,
  • Shide Li,
  • Mikhail Dmitrievich Starostenkov,
  • Guojiang Dong

摘要

The laser powder bed fusion (LPBF) technology is employed to manufacture the 316L-CuCrZr bi-material. The microstructure characteristics of 316L-CuCrZr gradient specimen including grain size, element distribution, and precipitate phase were analyzed. Lots of Fe-rich and Cu-rich phases with different shapes are found at the interface zone of 316L steel and LPBF-printed CuCuZr alloy, which indicates that sufficient element diffusion was occurred. The ε-Cu, γ-Fe and Cr phases are also identified by selected area electron diffraction (SAED). Furthermore, due to the synergistic effect of fine grain strengthening, precipitation strengthening, and heterostructure, the LPBF-fabricated 316L-CuCrZr interface with excellent joining strength is obtained. The specimen prepared with 450 W-400 mm/s exhibits excellent mechanical performance (the ultimate tensile strength: 290 MPa; the yield strength: 208 MPa; the elongation: 20%). After aging treated at 450 ℃ for 2 h, the ultimate tensile strength and yield strength of the specimen reached 521 MPa and 434 MPa, respectively. This research can provide some reasonable suggestions and guidance for preparing multi-material structures.