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利用自制的低温气体多元共渗控制系统,在570℃于可控气氛下(氨气与氧气的体积比为8∶1)对38CrMoAl钢进行了2 h氧氮共渗处理。采用OM、XRD分析,显微硬度测试,摩擦磨损试验和中性盐雾试验等手段,研究了38CrMoAl钢经共渗处理后的表面组织形貌、硬度与耐磨耐蚀性能。结果表明,38CrMoAl钢气体氧氮共渗后渗层深度为0.25 mm,表面有15μm左右均匀致密的白亮层,渗层主要由ε-Fe2~3N和γ′-Fe4N和少量的α-Al2O3组成,表面硬度为780~1130 HV0.1,与原材料相比,经过氧氮共渗处理后的样品的耐磨性和抗蚀性大幅度提高。
38CrMoAl steels were treated with oxygen-nitrogen for 2 h at 570 ℃ in a controlled atmosphere (the volume ratio of ammonia to oxygen was 8: 1) by using self-made low-temperature gas multicomponent infiltration control system. The surface morphology, hardness and wear resistance and corrosion resistance of 38CrMoAl steel were studied by OM, XRD, microhardness test, frictional wear test and neutral salt spray test. The results show that the infiltration depth of the oxygen-infiltrated 38CrMoAl steel is 0.25 mm, and the surface of the 38CrMoAl steel is white and bright with an average density of 15μm. The infiltrated layer mainly consists of ε-Fe2 ~ 3N, γ’-Fe4N and a small amount of α-Al2O3, Surface hardness of 780 ~ 1130 HV0.1, compared with the raw materials, after the sample after nitriding wear resistance and corrosion resistance greatly improved.