从金相组织及断口形貌两个方面对切割硬质材料的某金属陶瓷刀具断裂的原因进行了分析。结果表明,刀刃部位的镍铬基金属TiC陶瓷存在严重未烧结缺陷,成为起裂源;不合理的热处理工艺造成了刀具基体3Cr13晶粒粗大,并且沿晶界呈网状分布有脆性碳化物,导致基体脆性增加,在使用过程中发生沿晶断裂。 The reasons for the rupture of a cermet cutter cutting hard materials were analyzed from both microstructure and fracture morphology. The results show that there are serious unsintered defects in the NiCr TiM ceramics at the blade edge and become the source of cracking. The unreasonable heat treatment causes the coarse grain of the tool substrate 3Cr13 and the distribution of brittle carbides along the grain boundaries, Resulting in increased brittle matrix, in the process of occurrence of intergranular fracture.