Effects of Rare Earths on Cast Microstructure and Mechanical Properties of 8Cr4MoV Cold Work Roll Steel

摘要

Cast performance study of 8Cr4MoV cold work roll steels with four kinds of different rare earth content was carried out in the laboratory, the steels smelting by 50 kg vacuum induction furnace, atmospheric casting, processing sample after annealing, then inspecting the microstructure, mechanical properties and micro-fracture characteristics of the steels; The results showed that the steels' microstructure fine, micro-hardness and tensile strength increased with increasing rare earth content, while the shrinkage to eliminate, the micro-fracture characteristics of the tensile specimen showed a tendency of the cleavage unit narrowing and reduction of secondary cracks, and also the ductility improved.