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离子轰击热处理(包括离子氮化,渗碳、碳氮共渗、复合渗层等)是通过不同气氛的低气压辉光放电这一特定的物理过程来实现的。本文探讨了辉光——弧光转变的物理本质,结合热处理的需要,讨论了离子轰击热处理对电源的要求,提出了掌握和控制强电流异常辉光放电的三种电路,其中电子开关电路最大电流可做到500安培,开关速度10~(-5)秒,无限流电阻。三种电路均已应用于生产。 既耐磨又有良好韧性的单相化合层——离子氮化韧性层,主要是通过控制气体成分和调节各种工艺参数来实现的。本文讨论了γ′相的性质和形成条件、各种因素对氮化层相成分的影响规律及γ′相的组织特征,还阐述了低温离子氮化的可能性及其特点,它能大大减少工件变形,提高表面硬度,降低表面粗糙度。本工艺已应用于生产。对于要求高疲劳强度和磨损抗力、氮化后变形小的高速重载运动部件如柴油机曲轴,或形状复杂容易变形的零件,可采用韧层低温离子氮化。
Ion bombardment heat treatment (including ion nitriding, carburizing, carbonitriding, composite infiltrating, etc.) is achieved through the specific physical process of low pressure glow discharge in different atmospheres. In this paper, the physical nature of the glow-arc transition is discussed. The requirements of the heat treatment for ion bombardment are discussed in conjunction with the heat treatment. Three circuits for controlling and controlling the abnormal current glow discharge are proposed. The maximum current of the electronic switch circuit Can do 500 amps, switching speed of 10 ~ (-5) seconds, unlimited current resistance. All three circuits are used in production. The single-phase composite layer, an ion nitrided tough layer that is both wear-resistant and tough, is achieved by controlling the gas composition and adjusting various process parameters. In this paper, the properties and forming conditions of γ ’phase, the influence law of various factors on the phase composition of nitrided layer and the microstructure of γ’ phase are discussed. The possibility of low temperature ion nitriding and its characteristics are also discussed. Deformation of the workpiece to improve the surface hardness and reduce the surface roughness. This technology has been applied to the production. For high-speed heavy-duty moving parts requiring high fatigue strength and wear resistance after nitriding, such as diesel engine crankshafts, or parts with complex shapes and deformations, low-temperature plasma nitriding can be used.