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用不同Co含量的超细晶硬质合金刀具对高温合金GH2132进行了高速连续切削试验,根据最小二乘法对试验结果进行了线性回归,建立了刀具寿命与切削速度之间的关系即T-υc经验公式;随后进行了高速断续切削刀具磨损试验,用连续变倍体视显微镜及显微摄影系统观察了刀具刃口和后刀面的磨损形貌,并对达到磨钝标准时的刀具后刀面磨损微区成分进行了电子探针能谱分析,探讨了粘结相Co含量对刀具磨损性能的影响机理。结果表明:粘结相Co含量过高或过低,均会降低刀具的耐磨损和破损性能。
High-speed continuous cutting test of superalloy GH2132 was carried out with different Co content ultrafine-grained cemented carbide tools. The linear regression was performed on the test results according to the least squares method. The relationship between tool life and cutting speed was established, ie T-υc Empirical formula; subsequently high-speed intermittent cutting tool wear test, with continuous zoom stereo microscope and microscopy system to observe the wear edge of the tool and the flank wear morphology, and to blunt the standard knife back knife Surface micro-area composition of the electron probe energy spectrum analysis to explore the binding phase Co content of the tool wear resistance mechanism. The results show that: the binder phase Co content is too high or too low, will reduce the tool wear resistance and damage properties.