论文部分内容阅读
根据1975年以来进行的基本研究,综述了铁素体状态气体氮碳共渗的物理冶金特性,这些基础研究表明:在570℃的Fe—C—N 三元相图与实验上观察到的ε相碳氮化合物同铁素体共存的现象是不相容的。对徐和李、以及Slycke 等进行的热力学研究作了评述,以说明经修正的Fe—C—N 系等温截面与不同工艺条件下单相ε组织的生长过程是一致的。讨论了修正后的相图在革新铁素体氮碳共渗生产应用方面的意义。强调了发展黑色氮碳共渗工艺的重要性,它用于增强抗磨损、抗疲劳和抗腐蚀性能。还综述了奥氏体氮碳共渗处理的基础研究和生产应用现状,这种处理着重于强化基体,使得增强抗咬卡性能的化学热处理适于重载应用。
According to the basic research carried out since 1975, the physical and metallurgical properties of gas nitrocarburising in ferrite state are summarized. These basic studies show that the ternary phase diagram of Fe-C-N at 570 ℃ and the experimentally observed ε The phenomenon that phase carbon nitrogen compounds coexist with ferrite is incompatible. The thermodynamic researches on Xu and Li, Slycke and others are reviewed to show that the modified isothermal section of Fe-C-N is consistent with the growth of single-phase ε under different conditions. The significance of the modified phase diagram in the innovation of ferritic nitrocarburizing production is discussed. Underlined the importance of developing a black nitrocarburizing process for enhancing abrasion, fatigue and corrosion resistance. The basic research and production and application status of austenitizing nitrocarburizing are also reviewed. The treatment focuses on strengthening the matrix so that the chemical heat treatment that enhances the anti-seizure performance is suitable for heavy-duty applications.