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1 Journal of Achievements in Materials and Manufacturing Engineering

1 2008

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The influence of kinetics phase transformation during tempering on the mechanical properties of HS6-5-2 steel

Bała P., Pacyna J.

Journal of Achievements in Materials and Manufacturing Engineering

2008

Vol. 28, nr 2

123-130

Purpose: The reason for writing this paper was to describe the kinetics of phase transformations during tempering and the evaluation of the influence of pre-tempering on the properties of HS6-5-2 steel after principal tempering. Moreover, the differences in hardness of samples of the investigated steel in relationship to the heating rate were evaluated. The microstructure development in tested samples, reflecting the extend of the phase transformations during tempering, was discussed too. Design/methodology/approach: Dilatometric investigations were performed using a DT 1000 dilatometer of a French company Adamel. The microstructure of investigations steels were examined by transmission JEM200CX microscope. Due to high brittleness of test steel it was decided to test their strength with static bend test. The tests have been carried out on ø 5 samples using INSTRON testing machine. Evaluation of crack resistance of test steels has been made by means of linear elastic fracture mechanics method on the basis of the measurement of stress intensity factor KIc, in static bend test. Findings: Change of heating rate during tempering has strong influence on the temperatures of beginnings and the ends of individual transitions as well as on the accompanying dilatation effects. It has been stated that, in test steel in which remains a lot of retained austenite after hardening, the pre-tempering within the range of cementite precipitation and transformation of retained austenite, adversely affects the properties after principal tempering. Research limitations/implications: Description of the influence of phase transformation on the mechanical properties of HS6-5-2 high speed steel. Practical implications: It was shown, that advance (by pre-tempering) of selected phase transformations during tempering may affect steel properties after principal tempering. Originality/value: This results should be of interest to engineers concerned with design new technologies of steel tempering.