The company developed a method to improve the rotary bending fatigue performance of locomotive axle steel, which belongs to the field of metal material surface nano technology. In this method, the surface of LZ50 steel of locomotive axle is nano treated by surface mechanical rolling treatment technology, and the treatment process is carried out on the NC surface nano treatment system. After surface nano treatment, the surface structure of LZ50 steel changes into gradient nanostructure, that is, the grain size of the outermost layer is 10-50nm, and the grain size gradually increases to the original grain size with the increase of layer depth; The surface hardness of LZ50 steel in the state of nano treatment shows a gradient distribution, and the microhardness value of the outermost layer is greater than 3.0gpa, which is significantly higher than that of the substrate; The surface roughness of LZ50 steel in the state of nano treatment is less than 0.4 μ m. Compared with the turning surface, it is significantly improved. The rotary bending fatigue property of LZ50 steel for locomotive axle has been significantly improved after surface nano treatment.
The company developed a method to improve the rotary bending fatigue performance of locomotive axle steel, which belongs to the field of metal material surface nano technology. In this method, the surface of LZ50 steel of locomotive axle is nano treated by surface mechanical rolling treatment technology, and the treatment process is carried out on the NC surface nano treatment system. After surface nano treatment, the surface structure of LZ50 steel changes into gradient nanostructure, that is, the grain size of the outermost layer is 10-50nm, and the grain size gradually increases to the original grain size with the increase of layer depth; The surface hardness of LZ50 steel in the state of nano treatment shows a gradient distribution, and the microhardness value of the outermost layer is greater than 3.0gpa, which is significantly higher than that of the substrate; The surface roughness of LZ50 steel in the state of nano treatment is less than 0.4 μ m. Compared with the turning surface, it is significantly improved. The rotary bending fatigue property of LZ50 steel for locomotive axle has been significantly improved after surface nano treatment.
