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在用高速钢刀具切削中,通常认为被加工材料的硬度直接影响其切削性.用极限切削速度作为评定切削性的标准(刀具切削时间为30秒),发现工件的硬度值固然重要,然而其金相显微组织却强烈地影响钢的切削性.40CrMo钢通过不同热处理后,具有相同硬度值下获得不同的金相显微组织.完全球化的碳化物形态具有最佳的切削性,最大切削速度为90米/分,不完全球化碳化物相的切削速度为76米/分,具有片状碳化物形态的供应(轧制)状态为69米/分. 试验得出:一定硬度值下,钢的切削性取决于钢中珠光体或回火马氏体的碳化物形态和切削过程中碳的溶解度.
In high-speed steel cutting tool, it is generally considered that the hardness of the material to be machined directly affects its machinability.Using the ultimate cutting speed as the standard to evaluate the machinability (tool cutting time is 30 seconds), it is found that the hardness value of the workpiece is important, however, Metallurgical microstructure has a strong influence on the machinability of steel.40CrMo steel obtained by different heat treatment, with the same hardness value obtained under different microstructure microstructure of completely carbide ball with the best cutting, the maximum cutting speed of 90 M / min, the rate of incompletely carburized carbide cutting was 76 m / min, and the state of supply (rolling) with lamellar carbides was 69 m / min. The test showed that at a certain hardness value, The machinability depends on the carbide morphology of pearlite or tempered martensite in steel and the solubility of carbon during the cutting process.