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<p>This study employed spark plasma sintering (SPS) combined with hot rolling to fabricate a silicon carbide particle (SiCp)/316L symmetrically gradient layered structure. Analysis using SEM, EBSD, XRD, and microhardness testing revealed that after SPS sintering, the 10%SiCp/316L layer formed fine grains (&lt;&#xa0;10&#xa0;μm<sup>2</sup>) because of the particle pinning effect, while the pure 316L layer exhibited abnormally grown grains (&gt;&#xa0;500&#xa0;μm<sup>2</sup>). Grain deformation, fragmentation, and recrystallization occurring during hot rolling refined the grains. Furthermore, texture analysis indicated that the 10%SiCp/316L layer developed a rot-Cube texture because of the high strain rate, whereas the 3%SiCp/316L layer was dominated by a Cube-Goss mixed texture. Hot rolling significantly enhanced the mechanical properties of the material, with the ultimate tensile strength increasing by 7.27% and the elongation improving by 9.27% compared to the pre-rolled condition. Hardness testing demonstrated that the hardness of the gradient structure illustrated a symmetrical distribution. After hot rolling, the hardness of the 10%SiCp layer (321.53 HV) increased by 57.93% compared to the pure 316L layer. This research provided a theoretical basis for the controllable fabrication and performance optimization of gradient composites.</p>

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Fabrication of SiCp/316L Symmetrically Gradient Layered Structure and Investigation of Microstructural Evolution Mechanism

  • 期刊论文

  • 发表日期：

    2026年3月23日

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  • Ning-zhi Zheng,
  • Xin-tao Sun,
  • Zheng-yu Zhong,
  • Ying Guo

摘要

This study employed spark plasma sintering (SPS) combined with hot rolling to fabricate a silicon carbide particle (SiCp)/316L symmetrically gradient layered structure. Analysis using SEM, EBSD, XRD, and microhardness testing revealed that after SPS sintering, the 10%SiCp/316L layer formed fine grains (< 10 μm2) because of the particle pinning effect, while the pure 316L layer exhibited abnormally grown grains (> 500 μm2). Grain deformation, fragmentation, and recrystallization occurring during hot rolling refined the grains. Furthermore, texture analysis indicated that the 10%SiCp/316L layer developed a rot-Cube texture because of the high strain rate, whereas the 3%SiCp/316L layer was dominated by a Cube-Goss mixed texture. Hot rolling significantly enhanced the mechanical properties of the material, with the ultimate tensile strength increasing by 7.27% and the elongation improving by 9.27% compared to the pre-rolled condition. Hardness testing demonstrated that the hardness of the gradient structure illustrated a symmetrical distribution. After hot rolling, the hardness of the 10%SiCp layer (321.53 HV) increased by 57.93% compared to the pure 316L layer. This research provided a theoretical basis for the controllable fabrication and performance optimization of gradient composites.