Abstract
40CrNiMoA steel was nitrided by arc plasma-assisted nitriding (PAN) process at 430 °C, 1 Pa for 3 h with different N2/Ar ratios. Their structures, micrographs, microhardness profiles and tribological properties were investigated by X-ray diffraction (XRD), optical microscope, SEM, Vickers microhardness tester and pin-on-disk tribometer, respectively. All of the nitrided layers were primarily consisted of the γ′-Fe4N and ε-Fe3N. The thickness of compound layers increased with the N2/Ar ratio increasing. The maximum thickness of the compound layer was about 6 μm after nitriding, while the thickness of nitrided layer reached about 230 μm. The surface microhardness and wear resistance of the steel were significantly improved. Its maximum surface microhardness enhanced as 3 times (approx.) as that of the substrate. The wear mechanism changed from adhesive wear to abrasive wear. In addition, the nitrided sample treated at N2/Ar ratio of 75%:25% had the optimum abrasion resistance and lowest wear rate.
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Zhang, N., Yang, Z., Li, H. et al. Effect of N2/Ar Ratio on Microstructure and Tribological Property of Arc Plasma-Assisted Nitrided 40CrNiMoA Steel. Trans Indian Inst Met 76, 2735–2743 (2023). https://doi.org/10.1007/s12666-023-02966-6
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DOI: https://doi.org/10.1007/s12666-023-02966-6