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.
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