On the austempering behaviour and toughness of austempered engineering grade ductile iron castings

Kisakurek S., Ozel A., Yalcin Y., Turk A., Akbulut H., Okumus S.

70th World Foundry Congress 2012, WFC 2012, Monterrey, Mexico, 25 - 27 April 2012, pp.546-558, (Full Text) identifier

  • Publication Type: Conference Paper / Full Text
  • City: Monterrey
  • Country: Mexico
  • Page Numbers: pp.546-558
  • Keywords: Austemperability, Austempered ductile iron, Austempering, Austenite, Bainite, Bainitic ductile iron, Hardenability, Toughness
  • Manisa Celal Bayar University Affiliated: Yes

Abstract

Austempering behaviour of engineering grade ductile iron castings have been studied by measuring the effects of the as-cast structure, the chemical composition, nodule count and the heat treatment parameters, austenitising temperature, austenitising time, austempering temperature and austempering time, on the hardness, impact touhness and microstructure developments in austempering process Method of factorial experimentation was employed to identify the relative effects of the heat treatment parameters on toughness variations, as well as, changes occurred in nodular characteristics during austempering. Finally, results of part of the studies on ductile/brittle transition behaviour of austempered GGG40 and GGG80 grade castings were briefly presented.