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<p>In order to improve the wear resistance performance of IN718 and to achieve a low coefficient of friction of IN718, the effect of laser power variation on the properties of IN718/Mo composite coating was investigated. The results reveal that the main phases of IN718/Mo composite coating are <i>γ</i>-Ni, (Fe, Ni), <i>γ</i>′-Ni<sub>3</sub>(Al, Ti), Mo<sub>2</sub>N, and Ti<sub>2</sub>N. With the increase of laser power, the dendrites in the coating become shorter. The secondary phases dispersedly distributed in the coating possess a layered structure. The cores of the secondary phases are Ti<sub>2</sub>N and Mo<sub>2</sub>N, which are surrounded by elements of Fe and Ni. The elements of Fe and Ni become enriched. With the increase of the laser power, the hardness variation of the surface layer of the coating shows an inverted V-shaped pattern (The surface hardness of 1700 W coating is the highest, which is, respectively, 1.10 times and 1.13 times that of 1500 and 2000 W.). The coefficient of friction of the coating does not increase synchronously at high temperature, and 2000 W coating has the lowest coefficient of friction, which is 0.13. Due to the comprehensive effect of anti-wear and anti-friction of the coating, the wear rate of 1700 W coating under high temperature is the lowest when the laser power varies from 1500 to 2000 W, which is 2.9 × 10<sup>−4</sup> mm<sup>3</sup> N<sup>−1</sup>&#xa0;m<sup>−1</sup>.</p>

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Research on the Effect of Laser Power Variation on the Performance of IN718/Mo Composite Coatings Fabricated on IN718 Surface

  • 期刊论文

  • 发表日期：

    2025年9月2日

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  • Wen Zhang,
  • Ming Pang

摘要

In order to improve the wear resistance performance of IN718 and to achieve a low coefficient of friction of IN718, the effect of laser power variation on the properties of IN718/Mo composite coating was investigated. The results reveal that the main phases of IN718/Mo composite coating are γ-Ni, (Fe, Ni), γ′-Ni3(Al, Ti), Mo2N, and Ti2N. With the increase of laser power, the dendrites in the coating become shorter. The secondary phases dispersedly distributed in the coating possess a layered structure. The cores of the secondary phases are Ti2N and Mo2N, which are surrounded by elements of Fe and Ni. The elements of Fe and Ni become enriched. With the increase of the laser power, the hardness variation of the surface layer of the coating shows an inverted V-shaped pattern (The surface hardness of 1700 W coating is the highest, which is, respectively, 1.10 times and 1.13 times that of 1500 and 2000 W.). The coefficient of friction of the coating does not increase synchronously at high temperature, and 2000 W coating has the lowest coefficient of friction, which is 0.13. Due to the comprehensive effect of anti-wear and anti-friction of the coating, the wear rate of 1700 W coating under high temperature is the lowest when the laser power varies from 1500 to 2000 W, which is 2.9 × 10−4 mm3 N−1 m−1.