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1 Journal of Achievements in Materials and Manufacturing Engineering

1 2007

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The kinetics of phase transformations during tempering in the new hot working steel

Bała P., Pacyna J., Krawczyk J.

Journal of Achievements in Materials and Manufacturing Engineering

2007

Vol. 22, nr 2

15-18

Purpose: This work contains a detailed description of the kinetics of phase transformations during tempering of new hot working steel. Moreover, the differences in microstructure of samples of the investigated steel in relationship to the heat treatment were evaluated. Design/methodology/approach: CHT diagram, illustrating the kinetics of phase transformations during continuous heating (tempering) from as-quenched state of investigated steel, was elaborated using a DT1000 dilatometer of a French company Adamel. In the case of investigations of the microstructural changes, quenched samples were heated with a heating rate of 0.05 degree centigrade/s to the temperatures of 210, 320 and 420 degrees centigrade. The microstructure of investigated steel were examined using transmission JEM 200 CX microscope. Findings: Heating of the investigated steel from the as-quenched state resulted in the occurrence of 4 primary transformations: precipitation of epsilon carbide, M3C precipitation, transformation of retained austenite and precipitation of alloy carbides of MC and M2C type, nucleating independently. TEM investigations focused on determination of a degree of phase transformations during continuous tempering, showed compatibility of the microstructure with CHT diagram for tested steel. Research limitations/implications: The new CHT diagram of investigated steel was determined. Practical implications: The obtained CHT diagram may be used to design new technologies of tempering of this steel. Originality/value: The new CHT diagram, characterization of tempering new hot working steel.