Hardness and Microstructural Characterization of Powder Metallurgy Steel Subjected to Martempering Heat Treatment


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Güney K. C., Şahin B., Altuntaş O., Güral A.

International Conference on Advanced Materials Science & Engineering and High Tech Devices Applications; Exhibition (ICMATSE 2020), Ankara, Turkey, 2 - 04 October 2020, pp.120-124

  • Publication Type: Conference Paper / Full Text
  • City: Ankara
  • Country: Turkey
  • Page Numbers: pp.120-124
  • Gazi University Affiliated: Yes

Abstract

Production of High Carbon Powder Metallurgy specimens, ATOMET 1001 pure iron powders produced by atomization method and 1.5% by weight graphite powder as a carbon source were mixed and then pressed in a single action press with 700 Mpa pressure. The pressed specimens were then sintered in Ar atmosphere in the atmosphere controlled furnace to produce high carbon powder metal steel with a rate of 1.5% carbon. Firstly, specimens were austenitized at 950 °C for 4 minutes and martempering heat treatment was applied in a neutral salt bath with a temperature of 350 °C - 400 °C for different periods. It was observed that the hardness decreased due to the decrease in martensitic regions in the microstructure with increasing martempering times. Keywords: Powder Metallurgy Steel, Martempering, Bainite, Martensite.