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1 Journal of Achievements in Materials and Manufacturing Engineering

1 2008

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Kinetics of the austenite formation during intercritical annealing

Lis J., Lis A.

Journal of Achievements in Materials and Manufacturing Engineering

2008

Vol. 26, nr 2

195-198

Purpose: of this paper is the effect of the microstructure of the 6Mn16 steel after soft annealing on the kinetics of the austenite formation during next intercritical annealing. Design/methodology/approach: Analytical TEM point analysis with EDAX system attached to Philips CM20 was used to evaluate the concentration of Mn in the microstructure constituents of the multiphase steel. Findings: The increase in soft annealing time from 1-60 hours at 625*C increases Mn partitioning between ferrite and cementite and new formed austenite and decreases the rate of the austenite formation during next intercritical annealing in the (α+γ) temperature range at 700 and 750*C. Research limitations/implications: The amount of the austenite and final multiphase microstructure can be optimised by changing the time/temperature parameters of the intercritical heating in the (α+γ) temperature range. Originality/value: The knowledge of partitioning of alloying elements mainly Mn during soft annealing is very important to optimise the processing technology of intercritical annealing for a given amount of the austenite.