Study and analysis of the performance of wear-resistant plate by cryogenic treatment
The relative wear resistance of the wear-resistant plate is increased by 40% after cryogenic treatment, and the relative wear resistance is increased when the hardness does not change much after extending the cryogenic treatment time.
In the cryogenic treatment process, a large number of residual austenite is transformed into martensite, especially the susaturated metastable martensite will reduce susaturation in the process from -196℃ to room temperature, precipitating dispersed, the size of only 20-60A and the matrix to maintain a uniform relationship with the ultra-fine carbide, which can reduce the lattice distortion of martensite, reduce the microscopic stress, and fine dispersion The carbide in the plastic deformation of the material can hinder the dislocation movement, thus strengthening the matrix structure.
At the same time, due to the precipitation of ultra-fine carbide particles in the wear-resistant plate, the uniform distribution on the martensitic matrix, the grain boundary catalysis is weakened, and the thinning of the matrix structure not only weakens the degree of segregation of impurity elements in the grain boundary, but also plays the role of grain boundary strengthening, thus improving the performance of the wear-resistant plate, and significantly improving the hardness, impact toughness and wear resistance. The hardness of the mold is high, and its wear resistance is good, such as the hardness is increased from 60HRC to 62-63HRC, and the wear resistance of the mold is increased by 30%-40%.
