Scholarlink

<p>In this work, SiC/TC11 composites were prepared on TC11 substrates by designing different laser powers. The effects of laser process parameters on the microstructure and properties of the coatings were investigated<b>.</b> Phase composition was characterized via x-ray diffraction, and microstructure was examined in detail using scanning electron microscopy. The results revealed that with increasing laser power, SiC decomposes continuously and reacts in situ with Ti, Mo, and other elements in the molten pool, thereby generating TiC and MoC reinforcing phases. The degree of grain refinement was greater at low power (900&#xa0;W), whereas the level of SiC decomposition remained insufficient. When the laser power was too high (1700 and 2100&#xa0;W), the microstructure coarsened and became susceptible to cracks and other defects. The application of medium power (1300&#xa0;W) provided a balanced relationship between grain size and in situ precipitated phase. Mechanical property tests revealed that the C13 coating (fabricated at 1300&#xa0;W) achieves the best performance. Notably, the average microhardness was 1.74 times that of the substrate (366.8&#xa0;HV<sub>0.2</sub>), and the average friction coefficient was 81% of that of the substrate. The coating deposited at an intermediate power level and incorporating SiC exhibited the most significant strengthening effect.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Enhanced Mechanical Performance of SiC/TC11 Composites via Laser Cladding: Role of Laser Power and Strengthening Mechanisms

  • 期刊论文

  • 发表日期：

    2026年4月16日

查看全文
  • Haixia Yang,
  • Weipeng Duan

摘要

In this work, SiC/TC11 composites were prepared on TC11 substrates by designing different laser powers. The effects of laser process parameters on the microstructure and properties of the coatings were investigated. Phase composition was characterized via x-ray diffraction, and microstructure was examined in detail using scanning electron microscopy. The results revealed that with increasing laser power, SiC decomposes continuously and reacts in situ with Ti, Mo, and other elements in the molten pool, thereby generating TiC and MoC reinforcing phases. The degree of grain refinement was greater at low power (900 W), whereas the level of SiC decomposition remained insufficient. When the laser power was too high (1700 and 2100 W), the microstructure coarsened and became susceptible to cracks and other defects. The application of medium power (1300 W) provided a balanced relationship between grain size and in situ precipitated phase. Mechanical property tests revealed that the C13 coating (fabricated at 1300 W) achieves the best performance. Notably, the average microhardness was 1.74 times that of the substrate (366.8 HV0.2), and the average friction coefficient was 81% of that of the substrate. The coating deposited at an intermediate power level and incorporating SiC exhibited the most significant strengthening effect.