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以新型高性能渗氮轴承钢0.30C-Cr-W为对象,研究了经真空离子渗后的氮层微观组织及高周旋转弯曲疲劳性能。结果表明:实验钢渗氮后渗层中化合物层为γ’-Fe_4N和VN相,VN的平均等效直径为80 nm,弥散分布在γ’-Fe_4N中;扩散层晶界析出大量VN,晶内有大量细小弥散的M_3C;渗氮后在107循环周次下的中值疲劳强度为850MPa。起裂方式为夹杂起裂和表面缺陷起裂,在这两种起裂方式下,渗层可有效的提高疲劳寿命。
A new type of high-performance nitrided bearing steel 0.30C-Cr-W was taken as the object to investigate the microstructure and high-cycle bending fatigue properties of nitrogen layer after vacuum ion infiltration. The results show that the compound layers in the infiltrated steel after nitriding are γ’-Fe_4N and VN phases, the average equivalent diameter of VN is 80 nm, and the dispersion distribution is in γ’-Fe_4N; a large amount of VN and There are a large number of fine dispersed M_3C; after nitriding in 107 cycles weekly median fatigue strength of 850MPa. The initiation mode is inclusions and surface defects. In both of these modes, the diffusion layer can effectively improve the fatigue life.