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钢的切削性能是根据切削刀具寿命的长短、切削加工表面状态的优劣、切屑处理的难易及加于刀具上切削力的大小等四个方面来加以评价的。钢的切削性能好坏随钢的成分、金相组织与硬度等因素而变化。热处理也是影响钢的切削性能的因素,它是通过改变钢的内部金相组织及硬度而影响钢的切削性能的。热处理的作用是改变碳化物的形状和分布状态。钢中分散的碳化物起着应力集中源的作用,因此碳化物的形状、大小、数量、分布均匀性及彼此间的距离都对钢的切削性能有影响。从应力集中源的作用来看,片状碳化物影响较大,球状碳化物影响小,特别是均匀分布的球状碳化物影响更小。
Cutting performance of steel is based on the length of the cutting tool life, cutting the pros and cons of the surface condition, the difficulty of chip handling and added to the cutting force on the size of the tool to evaluate four aspects. The cutting performance of steel with the steel composition, microstructure and hardness and other factors change. Heat treatment is also a factor that affects the machinability of the steel. It affects the machinability of the steel by changing the internal microstructure and hardness of the steel. The role of heat treatment is to change the shape and distribution of carbides. The carbide dispersed in the steel plays a role as a stress concentration source, so the shape, size, amount, distribution uniformity and distance between each other affect the cutting performance of the steel. The role of stress concentration from the point of view, the larger impact of flake carbides, spherical carbides little effect, especially the uniform distribution of spherical carbides less affected.