Dilatometric investigations of Fe – Cr – Mo – C system

  • Maciej Sulowski AGH University of Science and Technology Faculty of Metals Engineering and Industrial Computer Science Department of Physical and Powder Metallurgy, Mickiewicz 30 Ave., 30-059 Krakow, Poland
  • Ewa Lichańska AGH University of Science and Technology Faculty of Metals Engineering and Industrial Computer Science Department of Physical and Powder Metallurgy, Mickiewicz 30 Ave., 30-059 Krakow, Poland
  • Paweł Kulecki AGH University of Science and Technology Faculty of Metals Engineering and Industrial Computer Science Department of Physical and Powder Metallurgy, Mickiewicz 30 Ave., 30-059 Krakow, Poland
  • Monika Tenerowicz-Żaba AGH University of Science and Technology Faculty of Metals Engineering and Industrial Computer Science Department of Physical and Powder Metallurgy, Mickiewicz 30 Ave., 30-059 Krakow, Poland
  • Anna Staniek AGH University of Science and Technology Faculty of Metals Engineering and Industrial Computer Science Department of Physical and Powder Metallurgy, Mickiewicz 30 Ave., 30-059 Krakow, Poland
Keywords: Powder metallurgy, sintered steels, dilatometric investigation, phase transformation

Abstract

Sintering behavior in high purity nitrogen and mixture of 5% H2-95% N2 of Fe-(Cr)-(Mo)-C system was investigated. The mixtures, differ from chromium, molybdenum and carbon content were prepared in Turbula mixer. Then, using single-action pressing in a rigid die at pressing pressure 400 MPa, green compacts with density level 5.9±0.17 g/cm3 were pressed. Sintering was carried out in a horizontal push rod dilatometer Netzsch 402E at 1120 and 1250°C for 60 min. Heating and cooling rates were 10 and 20°C/min., respectively. After heating, compacts were isothermal sintered at 1120 or 1250°C for 60 minutes an cooled up to 200°C, then isothermally hold for 60 minutes and definitely cooled to the room temperature. Pure nitrogen and mixture of 5% H2-95% N2 were employed as sintering atmospheres. During investigations the influence of isothermal sintering temperature, chemical composition of sintering atmosphere, chromium, molybdenum and carbon content was followed by dilatometry. The aim of investigations was to determine transformation temperatures. It was shown that the dimensional changes occurring during heating and isothermal sintering and the final density of sintered compacts are influenced by sintering parameters and the alloying elements concentration in powder mixture.

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Published
2018-12-21
How to Cite
Sulowski, M., Lichańska, E., Kulecki, P., Tenerowicz-Żaba, M., & Staniek, A. (2018, December 21). Dilatometric investigations of Fe – Cr – Mo – C system. ANNUAL JOURNAL OF TECHNICAL UNIVERSITY OF VARNA, BULGARIA, 2(2), 1-13. https://doi.org/10.29114/ajtuv.vol2.iss2.79
Section
MECHANICS, MATERIALS AND MECHANICAL ENGINEERING
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