Abstract: Effects of normal nitriding process with 280 Pa at 560 ℃ for 12 h and cycling plasma nil rich: g process with 170 Pa at 560 °C for 3 h then quick cooling to ambient temperature on structure, hardness, gradient of hardness, and wear resistance of nitride layer of steel 38CrMoAl ( % ： 0. 35 - 0. 42C, 1. 35 ~ 1.65 Cr, 0. 15 - 0. 25 Mo, 0. 70 - 1. 10 Al) have been tested. Results show that the cycling plasma nitriding process is available to decompose ε phase at surface layer, led to favorable nitriding of γ′ phase in steel: in the condition of getting same surface hardness of nitrided layer and gradient of hardness, the nitriding rate by cycle plasma nitriding process is obvious high than that by normal nitriding process, and the wear resistance of nitrided steel is improved.

Key words: Steel 38CrMoAl, Cycle Plasma Nitriding, Hardness, Wear Resistance

摘要： 试验了38CrMoAl钢(%:0.35～0.42C、1.35～1.65Cr、0.15～0.25Mo、0.70～1.10Al)280 Pa 560℃,12 h常规渗氮和170 Pa 560℃3 h快冷至室温循环等离子渗氮对渗氮层组织、硬度、硬度梯度和耐磨性的影响。结果表明,循环等离子体渗氮工艺有利于表层ε相分解,更有利于氮渗入钢中γ′相;在获得相同的渗层表面硬度和硬度梯度下,循环等离子渗氮速度明显高于常规渗氮速度,并改善渗氮后钢的耐磨性。

关键词: 38CrMoAl钢, 循环等离子渗氮, 硬度, 耐磨性