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1 Journal of Achievements in Materials and Manufacturing Engineering

1 2011

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The kinetics of phase transformations of undercooled austenite of the Mn-Ni iron based model alloy

Rożniata E., Dziurka R., Pacyna J.

Journal of Achievements in Materials and Manufacturing Engineering

2011

Vol. 49, nr 2

188--192

Purpose: Present work corresponds to the research on the kinetics of phase transformations of undercooled austenite of Mn-Ni iron based model alloy. The kinetics of phase transformations of undercooled austenite of investigated alloy was presented on CCT diagram (continuous cooling transformation). Also the methodology of a dilatometric samples preparation and the method of the critical points determination were described. Design/methodology/approach: The austenitising temperature was defined in a standard way i.e. 30-50°C higher than Ac3 temperature for model alloy. A technique of full annealing was proposed for the model alloy. The CCT diagrams were made on the basis of dilatograms recorded for samples cooled at various rates. The microstructure of each dilatometric sample was photographed after its cooling to the room temperature and the hardness of the samples was measured. Findings: The test material was a Mn-Ni hypoeutectoid iron based alloy. The microstructure of test Mn-Ni alloy on CCT diagram changes depending on the cooling rate. At the cooling rates of 10°C/s and 5°C/s there is ferrite in Widmannstatten structure present in the structure of tested alloy. Research limitations/implications: The new Mn-Ni iron based model alloy and a new CCT diagram. Practical implications: The paper contains a description of one from a group of iron based model alloys with 0.35-0.40% carbon content. According to PN-EN 10027 standard this steel should have a symbol 38MnNi6-4. Originality/value: The new Mn-Ni iron based model alloy.