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本试验对18CrMnTi钢分别进行了碳氮硼三元共渗与碳氮共渗处理,在ZYS-6型双面对滚式接触疲劳试验机上进行了接触疲劳的对比性试验,并在T322单对齿轮接触疲劳试验机上进行了齿轮台架试验。两种试验结果表明,三元共渗比二元共渗的接触疲劳寿命有成倍的提高。作者认为在渗层的最大切应力区的塑变抗力不足是疲劳裂纹产生的主要原因,通过径迹显微照相技术,分析了二元和三元共渗渗层的硼分布。认为在三元共渗时渗剂中硼的渗入对渗层起到强化作用,从而提高了钢的接触疲劳强度,这可能就是三元比二元共渗接触疲劳性能优越的原因之一。
In this experiment, 18CrMnTi steel were carbonitriding boron and carbonitriding nitrocarburizing treatment respectively, the ZYS-6 double-faced roller contact fatigue testing machine for contact fatigue test, and T322 single-pair Gear contact fatigue testing machine gear rack test. The results of two kinds of tests show that the contact fatigue life of ternary co-infiltration is higher than that of binary co-infiltration. The author believes that the plastic deformation resistance in the zone of maximum shear stress is the main reason of fatigue crack generation. The distribution of boron in binary and ternary infiltration layers is analyzed by means of track microscopy. It is considered that the infiltration of boron in the infiltrating agent plays a strengthening role in the infiltration layer during the ternary permeation, thereby improving the contact fatigue strength of the steel, which may be one of the reasons for the superior contact fatigue performance of the ternary ratio binary co-infiltration.