论文部分内容阅读
以空气、丙烷、氨气等作为气源,利用低温气体多元共渗技术在AISI4400C钢表面进行低温气体氧-氮-碳三元共渗处理,以提高其表面硬度。借助光学金相显微镜、X射线衍射仪、显微硬度计和扫描电镜,对渗层形貌、物相、显微硬度梯度变化趋势以及元素分布进行检测分析。结果表明,在基材表面共渗层形成了厚且均匀致密的化合物层,该化合物层以氮化物、碳化物和氧化物为主;三元共渗过程中氧的加入可促进化合物层的形成,缩短共渗时间,获得的三元共渗层表面硬度最高可达1170 HV。
Using air, propane and ammonia gas as gas source, low temperature gas oxygen and nitrogen - carbon ternary infiltration treatment was carried out on the surface of AISI4400C steel by multicomponent gas infiltration technique to improve its surface hardness. The optical microscope, X-ray diffractometer, microhardness tester and scanning electron microscope were used to detect and analyze the morphology, phase, the trend of microhardness gradient and elemental distribution. The results show that a thick and uniform compound layer is formed on the surface of the substrate, and the compound layer is mainly composed of nitrides, carbides and oxides. The addition of oxygen during the ternary permeation can promote the formation of the compound layer , Shorten the time of co-permeation, the surface hardness of ternary co-diffusion layer can be up to 1170 HV.