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对00Cr12Ni9Mo4Cu2Ti马氏体时效不锈钢进行了离子渗氮处理,研究了不同渗氮条件下所形成的渗氮层的相结构与性能。结果表明:经离子渗氮后的00Cr12Ni9Mo4Cu2Ti马氏体时效不锈钢的表面硬度、耐磨性都有明显的提高,表面硬度最高达到了1350HV0.05。当样品在400℃渗氮时,表层新相主要由α相组成;当渗氮温度上升至500℃时,表层新相主要由αN相、γ′-Fe4N相、ε相组成,并有大量的CrN相形成;当渗氮温度高于600℃时,ε相、CrN的含量继续增加,γ′-Fe4N相逐渐减少,αN相几乎完全分解。伴随着CrN相的生成,样品的耐磨性得到了提高,表面耐腐蚀性能有一定下降。实验还观察到该马氏体时效不锈钢渗氮层中有微裂纹产生,裂纹的形成与样品的残余内应力和氮化物相生成有关。
The nitriding treatment of 00Cr12Ni9Mo4Cu2Ti martensitic stainless steel was carried out. The phase structure and properties of nitrided layer formed under different nitriding conditions were studied. The results show that the surface hardness and wear resistance of 00Cr12Ni9Mo4Cu2Ti martensitic stainless steel after ion nitriding are obviously improved, the surface hardness reaches the highest 1350HV0.05. When the sample is nitrided at 400 ℃, the new phase of the surface consists mainly of α phase. When the nitriding temperature rises to 500 ℃, the new phase of the surface consists mainly of αN phase, γ’-Fe4N phase and ε phase, CrN phase. When the nitriding temperature is higher than 600 ℃, the ε phase and CrN content continue to increase, the γ’-Fe4N phase decreases gradually, and the αN phase decomposes almost completely. With the formation of CrN phase, the wear resistance of the samples is improved and the corrosion resistance of the surface is reduced. The experiment also observed that there was micro-cracks in the martensitic stainless steel nitrided layer. The formation of cracks was related to the residual internal stress and nitride phase of the samples.