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<p>GH3536 alloy, as a typical solid solution-strengthened, nickel-based high-temperature alloy, has been widely used in the preparation of hot-end components. In this paper, a nickel matrix composite (TiC + TiB<sub>2</sub>)/GH3536 reinforced with a mixture of submicron TiB<sub>2</sub> particles and micron TiC particles was prepared using SLM technology, demonstrated a tensile strength of 1206&#xa0;MPa and a microhardness of 469.7&#xa0;HV, which are 85.9% and 86.1% greater than those of the unreinforced GH3536 alloy, and 17.5% and 37.3% higher, respectively, when compared to composites with only 3&#xa0;wt.% micrometer TiC reinforcement. The effects of dual-phase and dual-size reinforcing particles on the machinability, microstructure, and mechanical properties of (TiC + TiB<sub>2</sub>)/GH3536 composites were systematically investigated, and the strengthening mechanisms were elucidated. The results indicate that, compared with the single addition of 3&#xa0;wt.% micron TiC, the strengthening effect produced by adding 1.5&#xa0;wt.% submicron TiB<sub>2</sub> and 1.5&#xa0;wt.% micron TiC is primarily achieved through fine grain strengthening and dislocation strengthening.</p>

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Influence of Second-Phase Particles on GH3536 Nickel-Based Superalloy in Selective Laser Melting Process

  • 期刊论文

  • 发表日期：

    2025年3月21日

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  • Yunqi Xie,
  • Huachen Liu,
  • Lichao Gong,
  • Song Huang,
  • Zhenhua Yao

摘要

GH3536 alloy, as a typical solid solution-strengthened, nickel-based high-temperature alloy, has been widely used in the preparation of hot-end components. In this paper, a nickel matrix composite (TiC + TiB2)/GH3536 reinforced with a mixture of submicron TiB2 particles and micron TiC particles was prepared using SLM technology, demonstrated a tensile strength of 1206 MPa and a microhardness of 469.7 HV, which are 85.9% and 86.1% greater than those of the unreinforced GH3536 alloy, and 17.5% and 37.3% higher, respectively, when compared to composites with only 3 wt.% micrometer TiC reinforcement. The effects of dual-phase and dual-size reinforcing particles on the machinability, microstructure, and mechanical properties of (TiC + TiB2)/GH3536 composites were systematically investigated, and the strengthening mechanisms were elucidated. The results indicate that, compared with the single addition of 3 wt.% micron TiC, the strengthening effect produced by adding 1.5 wt.% submicron TiB2 and 1.5 wt.% micron TiC is primarily achieved through fine grain strengthening and dislocation strengthening.