Effect of Ti-modified plasma nitriding on properties of precipitation-hardened steel

doi:10.13251/j.issn.0254-6051.2024.08.032

Abstract

Abstract: Plasma nitriding treatment for precipitation-hardened steel 20CrNi3Mn2Al was carried out with or without Ti (nitriding at 540 ℃ for 48 h with the infiltration agent of thermal decomposition NH₃). Then the hardness, effective nitrided layer depth, friction and wear performance, and corrosion performance of the nitrided layer after plasma nitriding were compared and analyzed, and the effect of Ti-modified plasma nitriding on properties of precipitation-hardened steel was studied. The results show that compared with conventional ion nitriding, the effective nitrided layer depth of Ti-modified ion nitriding specimen is increased by about 15%, and the hardness gradient is smoother. The maximum depth of scratches after friction and wear is 8.894 μm, and the depth of pits after corrosion is about 9 μm, which is reduced by about 45% and 36% compared to conventional plasma nitriding specimen, respectively. The wear resistance and corrosion resistance are significantly improved.

Key words: Ti-modified plasma nitriding, precipitation-hardened steel, nitrided layer depth, hardness, wear resistance, corrosion resistance

CLC Number:

TG156.8

Li Feng. Effect of Ti-modified plasma nitriding on properties of precipitation-hardened steel[J]. Heat Treatment of Metals, 2024, 49(8): 183-188.

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