Effects of Rare Earths on Inclusions Distribution and Modality 8Cr4MoV Cold Work Roll Cast Steel

摘要

A study of rare earth effects on inclusion modality of 8Cr4MoV cold work roll ste carried out in the laboratory, the steels smelting by a 50kg vacuum induction furnace, atmc casting, processing sample after annealing, then inspecting the steels'microstructure, ir modality and composition; The results showed that the steels' microstructure fine, micro-h increased with increasing rare earth content, while the average size of inclusions de significantly, also the morphology and composition of inclusions significantly changed fi angular black manganese sulfide to the ball white sulfur oxides of rare earth, and thus play of deoxidation, desulfurization, purification and deterioration of liquid steel, it will help im the fatigue performance of the work roll.