Effect of Mg treatment on the microstructure and mechanical properties of high carbon tool steel 75Crl during hot rolling
The morphology and microstructure changes of inclusions under different feeding lengths were compared and studied,when Mg containing cored wires of dfferent lengths were used to modify inclusions in high carbon tool steel 75Cr1 steel.The influence of Mg treatment on the microstructure and mechanical properties of experimental steel was studied by combining mechanical experiments and morphology characterization.The results show that Mg treatment is beneficial for refining inclusions,and the core part of the inclusions can be modified to MgO·Al2O3 or MgO,forming small-sized spherical"core-shell"inclusions wrapped in CaS.The modified small-sized inclusions are beneficial for pinning grain boundaries and refining austenite grains.At the same time,small-sized inclusions can also hinder the diffusion of carbon atoms in the steel,thereby reducing the incubation time for pearlite formation,reducing the interlayer spacing of pearlite,and improving the material's plasticity and toughness.The optimal feeding length of the core wire for 75Cr1 high carbon tool steel is 2～2.5 m/t.
万方数据
维普
