Austempered ductile iron (ADI): Influence of austempering temperature on microstructure, mechanical andwear properties and energy consumption

Prabhukumar Sellamuthu, D. G.Harris Samuel, D. Dinakaran, V. P. Premkumar, Zushu Li, Sridhar Seetharaman

Research output: Contribution to journalArticlepeer-review

30 Scopus citations

Abstract

Alloyed Ductile iron, austenitized at 840 °C for 30 min in a special sealed austempering furnace, was austempered for 30 min in molten salt mixture at 4 trial temperatures of 300 °C, 320 °C, 340 °C and 360 °C. Tensile strength, yield strength, percentage elongation and impact energy were evaluated for the as-cast and austempered samples. Microstructures were investigated using microscopy, coupled with analyzing software and a scanning electron microscopy. The specific wear of samples was tested using pin-on-disc wear testing machine. X-ray diffraction was performed to calculate the amount of retained austenite present in the ausferrite matrix. As-cast microstructure consists of ferrite and pearlite, whereas austempered ductile iron (ADI) contains a mixture of acicular ferrite and carbon enriched austenite, called “ausferrite”. Hardness and strength decreased, whereas ductility and impact strength improved with an increase in the austempering temperature. XRD analysis revealed that the increase in austempering temperature increased the retained austenite content. A decrease in wear resistance with austempering temperature was observed. Modified Quality Index (MQI) values were envisaged, incorporating tensile strength, elongation and wear resistance. MQI for samples austempered at 340 °C and 360 °C showed a better combination of properties. About an 8% reduction in energy consumption was gained when the heat treatment parameters were optimized.

Original languageEnglish (US)
Article number53
JournalMetals
Volume8
Issue number1
DOIs
StatePublished - Jan 12 2018
Externally publishedYes

Keywords

  • Austempered ductile iron (ADI)
  • Impact energy
  • Mechanical properties
  • Microstructure
  • Wear

ASJC Scopus subject areas

  • Materials Science(all)
  • Metals and Alloys

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