本文通过实验室试验,就20CrMnTi钢渗碳层中网状、颗粒状及球状碳化物形态对其弯曲疲劳及耐磨性的影响作了研究。试验结果表明,渗碳层中碳化物呈球状及颗粒状弥散分布时,明显地提高了材料的疲劳极限、抗过载能力及耐磨性;耐磨性还随马氏体基体上分布的细小、弥散的碳化物相的体积百分数的增加而增高。当碳化物相数量小于3～4%(面积百分数)、表面含碳量低于0.9～1.0%时,耐磨性急剧下降。 In this paper, through laboratory tests, the effects of reticular, granular and spherical carbides on the bending fatigue and wear resistance of carburized layers in 20CrMnTi steel were studied. The results show that carbides in the carburized layer have spherical and granular dispersive distribution, which obviously improve the fatigue limit, anti-overload ability and wear resistance of the carburized carburized layer. The volume fraction of dispersed carbide increases. When the amount of carbide phase is less than 3 ~ 4% (area percentage), the surface carbon content is less than 0.9 ~ 1.0%, the wear resistance drops sharply.