Effect of vanadium on nitrided layer of Cr12Mo die steel and its tribological behavior

doi:10.13251/j.issn.0254-6051.2022.09.040

Abstract

Abstract: Cr12Mo and Cr12MoV die steels were gas nitrided, and then the effect of V on microstructure and tribological behavior of Cr12Mo die steel was compared and analyzed. The results show that after gas nitriding, a nitrided layer with a depth of about 120 μm is prepared on the surface of both the two die steels, and the nitriding layer, diffusion layer and matrix are successively from the surface to the inside. The V improves the wear resistance of die steel, and the Cr12MoV steel shows better anti-wear effect. Compared with that on the increase of the hardness of the die steel matrix and the diffusion layer, the effect of V on the increase of the hardness of the zone near the maximum hardness value of the nitriding layer is more obvious. The effect of V on wear resistance of the nitrided layer of the two die steels is not obvious, but the main contribution of V is to promote the effective infiltration of N during nitriding, greatly improve the interface bonding force between the nitrided layer and the diffusion layer, avoid the cracking between the nitriding layer and the diffusion layer, and promote the change of the wear mechanism from fatigue wear to adhesive wear, and the service life of the nitrided layer is further improved.

Key words: Cr12MoV die steel, nitriding treatment, nitrided layer, wear resistance, wear mechanism

CLC Number:

TG156.8

Mei Lang, Fang Changyang, Li Qiuping. Effect of vanadium on nitrided layer of Cr12Mo die steel and its tribological behavior[J]. Heat Treatment of Metals, 2022, 47(9): 234-239.

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