论文部分内容阅读
当两个零件在相互接触下作相对运动时,由于微观原子的相互作用引起零件表面的机械侵袭,从而降低零件使用寿命。根据相对运动的形式,摩擦学交互作用可区分为,如滑动、滚动、旋转、冲击和流动等不同类型。静态和动态载荷对材料基体都能引起附加侵袭。因此在拉伸、压缩、弯曲和扭转条件下,提高疲劳强度,赋以更佳的强度特性。实际上,所观察到的往往是上述磨损性质的综合。为防止工件快迷断裂,已发展了各种热处理、表面硬化和镀层技术。在热处理工艺中,渗氮技术的应用越来越多,因为它的处理温度比表面硬化工艺,如感应硬化或渗碳的温度低,而且在宽的应用范围内,由于在工件表面有薄的金属间铁氮化合物相的形成,而且有更佳的耐磨性。这些化合物相具有优良的滑动与磨损特性,而化合物层下的氮扩散层产生内应力,从而提高疲劳强度。
When two parts make relative movement in contact with each other, the mechanical contact of parts surface is caused by the interaction of microscopic atoms, so as to reduce the service life of parts. Depending on the form of relative motion, tribological interactions can be distinguished as different types such as sliding, rolling, rotating, impacting, and flowing. Both static and dynamic loading can cause additional attack on the material matrix. Therefore, in the tensile, compression, bending and torsion conditions, improve fatigue strength, given better strength characteristics. In fact, what is observed is often a combination of the above-mentioned wear properties. In order to prevent the rapid collapse of the workpiece has been developed a variety of heat treatment, surface hardening and coating technology. In the heat treatment process, the application of nitriding technology is more and more because of its processing temperature than the surface hardening process, such as induction hardening or carburizing temperature is low, but also in a wide range of applications, due to the workpiece surface is thin Intermetallic iron nitride phase formation, but also better wear resistance. These compound phases have excellent sliding and wear characteristics, and the nitrogen diffusion layer under the compound layer generates internal stress, thereby improving the fatigue strength.