Step-Sintering of Fe-(1-3)%Mn-0.8%C Steels

Abstract:

The aim of the study was to examine how the microstructure changes during heating of Fe-Mn-C system (step-sintering). Mixtures of powders containing 1 – 3 % Mn and 0.8 % C were prepared in Turbula TC2 mixer for 30 minutes. Before step-sintering, the dilatometric investigations were carried out, which allowed to obtain phase transformation temperatures of Fe-(1-3)Mn%-0.8%C system. Following dilatometric investigations, 4 steps – temperatures were determined dependently of isothermal sintering temperature. The commonly used industry temperatures – 1120 °C and 1250 °C – were set as target temperatures. For each of them, 4 heat steps were carried out. The procedure of investigations was as follows: samples were heated to the step temperature with heating rate 60 K/min, then isothermally sintered at step temperature for 5 min, and finally cooled to the room temperature with cooling rate ~ 66 K/min. Fe-Mn-C samples were mechanically (tensile) tested. After tensile tests, metallographic observations of the samples were performed. Based on the results obtained, the tensile strength was increasing with the increasing of the step temperature. The metallographic observation showed the microstructure evolution – with increasing the step temperature, decreasing of porosity was observed.

• Periodical: Defect and Diffusion Forum (Volume 405)
• Pages: 373-378
• DOI: https://doi.org/10.4028/www.scientific.net/DDF.405.373
• Online since: November 2020
• Authors: Monika Tenerowicz-Żaba*, Maciej Sulowski
• Keywords: Manganese, Microstructure, Powder Metallurgy, Step Sintering

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DOI: 10.2298/sos1804457t