TA31钛合金是一种常用的海洋工作装备用钛合金，因其硬度低耐磨性差导致实际使用寿命较低。 为提高 TA31 钛合金的表面硬度进而改善耐磨性，对其进行渗碳处理，并研究渗碳处理对TA31钛合金组织及性能的影响。 分 别对未渗碳和渗碳的TA31钛合金试样显微组织、显微硬度、室温拉伸、冲击吸收功进行对比测试。 结果表明，渗 碳前后TA31钛合金的显微组织均为双态组织，但渗碳后次生α相发生粗化。渗碳处理后TA31钛合金表面最高硬度达 到945HV，有效硬化层超过100μm，提高了合金表面耐磨性。渗碳处理后TA31钛合金的抗拉强度降低，同时材料的塑 性增高、缺口敏感性降低。

As a commonly used titanium alloy for marine work equipment, the TA31 titanium alloy has a low actual service life because of its low hardness and poor wear resistance. Carburizing treatment was carried out to increase the surface hardness of the TA31 titanium alloy and thus improve its wear resistance. Moreover, the effects of carburizing treatment on the microstructure and properties of the TA31 titanium alloy were studied. The microstructure, microhardness, and room temperature tensile and impact absorption work of uncarburized and carburized TA31 titanium alloy samples were compared and analysed. The results show that the microstructure of the TA31 titanium alloy before and after carburizing is a bimorphic structure, but the secondary α phase is coarsified after carburizing. After carburizing treatment, the maximum surface hardness of the TA31 titanium alloy reaches 945 HV, and the effective hardening layer exceeds 100 μm, which effectively improves the surface wear resistance of the TA31 titanium alloy. After carburizing treatment, the tensile strength of the TA31 titanium alloy decreases, whereas the plasticity of the material increases and the notch sensitivity decreases.