Abstract: Microstructure,deformation degree and dynamic mechanical properties of high carbon steel quenched at different temperatures were studied by means of scanning electron microscopy,Hopkinson pressure bar and tensile testing machine.The results show that as the quenching temperature increases,the amount of residual carbides in the experimental steel decreases.At 880 ℃,the residual carbides in the experimental steel are all dissolved.After the dynamic mechanical test,due to the dissolution of the residual carbide,the increase in dynamic strength of the specimen quenched at 880 ℃ is small.And because it is insensitive to the strain rate,the uniform deformation becomes broken.There are holes in the area of the adiabatic shear band and away from the adiabatic shear band.Far from the area of the shear band,the holes are disorderly distributed and accompanied by carbides.The carbides near the adiabatic shear zone are unevenly distributed.And the holes inside the adiabatic shear bands expand along the heat propagation direction,forming cracks distributed along the shear band.

Key words: high carbon silicon manganese steel, dynamic properties, adiabatic shear bands, quenching temperature, carbide