Strengthening method for low-temperature nitriding composite low-temperature diffusion of pure titanium workpiece

The invention relates to the technical field of metal titanium nitriding, in particular to a strengthening method for low-temperature nitriding composite low-temperature diffusion of a pure titanium workpiece. The strengthening method comprises the following steps that the pure titanium workpiece is sequentially subjected to cold machining forming, low-temperature nitriding and low-temperature diffusion; wherein the deformation amount of cold machining forming is 10%-80%; the temperature of the low-temperature nitriding is 400-580 DEG C; and the temperature of the low-temperature diffusion is350-580 DEG C. By the adoption of the method, the nitriding rate and the nitriding layer thickness can be increased, the surface of pure titanium is sufficiently strengthened, the abrasion resistanceand contact fatigue performance of the pure titanium are improved, the plasticity and toughness of a base body can be improved, and the internal and external double strengthening effect is achieved; and meanwhile, the nitrogen