Case Hardening And Wear Property At High Temperature Of Electro-slag Melting And Casting Steel-bonded Carbide

The electro-slag melting and casting steel-bonded carbide DGJW50 were case hardened by boronizing. At the same time, the effect of heat treatment on the microstructure and high temperature abrasion property of the composites were discussed. The change of structure and wear performance of DGJW50 were investigated after boronizing treatment. The result of investigation indicates that the microstructure of steel matrix was changed by heat treatment. Synchronously, the combination between hard phase and metal matrix was improved. The borides layer can be formed in the surface of the composites after boronizing treatment. Besides the composites can be partitioned three layer after boronizing treatment: borides layer,transition zone and substrate. The phase of borides layer and the combine between borides layer and substrate will be changed at different boronizing temperature. At the same time, there are some new reinforced phases in the composites after boronizing treatment. Microhardness and wear resistance of the borides layer in the surface of electro-slag melting and casting steel-bonded carbide excelled to the substrate of composites. And then, the depth of borides layer increased with increasing treatment temperature of boronizing. The form of wear at high temperature had changed after boronized of the composites. Before boronizing on the composites were given priority to severe plough abrasion. However, after boronized of the composites forms of wear come forth abrasive wear. The treatment temperature of boronizing had decided to forms of wear of the composites at high temperature.