利用脉冲直流辉光等离子技术,对1Cr11Ni2W2MoV马氏体热强不锈钢进行不同工艺参数的离子渗氮。利用光学显微镜、显微硬度计、XRD对渗氮层的显微组织及硬度进行了分析。结果表明,在所选用的离子渗氮工艺参数下,1Cr11Ni2W2MoV钢渗层只由扩散层组成,渗氮温度≤560℃时,渗层主要由固溶N原子的α相组成,并伴有少量的γ’-Fe4N和CrN析出;随着渗氮温度的升高和渗氮时间的延长,固溶N原子的α相逐渐转变成γ’-Fe4N相,当处理温度达到590℃时,渗层主要由γ’-Fe4N和Cr N组成。离子渗氮后渗层的表面硬度较未渗氮前有显著的提高,在一定范围内,渗层的表面硬度和渗层深度都随着渗氮温度和渗氮时间的增加而增加,渗层硬度梯度分布也随着渗氮时间的延长变得平缓。 Using pulsed DC glow plasma technology, the 1Cr11Ni2W2MoV martensitic hot-tempered stainless steel was subjected to ion nitriding under different technological parameters. The microstructure and hardness of nitrided layer were analyzed by optical microscope, microhardness tester and XRD. The results show that the diffusion layer of 1Cr11Ni2W2MoV steel is only composed of diffusion layer under the selected parameters of ion nitriding process. When the nitriding temperature is less than or equal to 560 ℃, the diffusion layer mainly consists of α phase of solid solution N atoms with a small amount of γ’-Fe4N and CrN. With the increase of nitriding temperature and nitriding time, the α phase of solid-solution N atom gradually transformed into γ’-Fe4N phase. When the treatment temperature reached 590 ℃, By the γ’-Fe4N and Cr N composition. The surface hardness of the layer after ion nitriding is significantly higher than that before the nitriding. Within a certain range, the surface hardness and the depth of the layer increase with the increase of the nitriding temperature and nitriding time, Hardness gradient distribution also becomes smooth with the increase of nitriding time.