Effect of Rare Element Ce Solid Solubility on Microstructure and Properties of ZG32MnMoNiCu
The effect of rare element Ce on the microstructure and properties of ZG32MnMoNiCu was studied by adding the same content of rare element alloy to ZG32MnMoNiCu with different O and S contents.The mechanical properties of cast steel were tested by tensile,impact and hardness tests,and the microstructure and fracture morphology were observed by scanning electron microscopy.The results show that the high content of O and S combined with rare element Ce in the molten steel leads to the decrease of the solid solution of rare element Ce in the cast steel and the formation of rare element inclusions.When the solid solution of rare element Ce in the cast steel reaches 0.18%,the rare element inclusions formed by the cast steel have a segregation,showing aggregation and continuous chain.The high Ce solution content in cast steel increases the temperature of transformation from martensite to tempered sortensite.In the same heat treatment state,the microstructure not only forms granular tempered sortensite,but also partially exists tempered martensite structure,resulting in the strength of cast steel increased,plasticity and impact toughness decreased.
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