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Study of wear behaviour of ductile iron subjected to two step austempering

  • Ritha Kumari and P. Prasad Rao
Published/Copyright: May 18, 2013
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 101 Issue 7

Abstract

An investigation was carried out to examine the influence of two step austempering on microstructural parameters and the wear behaviour of austempered ductile iron. Ductile iron was austenitised at 900°C for 30 min, and then austempered successively at two different temperatures. It was first austempered at 300°C for different durations from 2 min to 30 min and subsequently austempered at 400°C for 2 h, after which it was quenched to room temperature. Resulting microstructures were characterised through optical microscopy and X-ray diffraction. Mechanical properties were studied through hardness measurement and tensile testing. Wear studies were carried out using a pin-on-disc machine. Wear rate was found to decrease with increasing time at the first step temperature of 300°C. At short austempering times at 300°C, the amount of austenite was instrumental in improving the wear resistance through formation of deformation induced martensite. Wear rate was found to depend on yield strength, austenite content and its carbon content.

Keywords: Ductile iron; Austempering; Wear; Austenite
∗ Prof. P. Prasad Rao, Department of Metallurgical and Materials Engineering, National Institute of Technology Karnataka, Surathkal, Mangalore 575025, Karnataka, India, Tel.: +91 824 247 4000 Ext. 3759, Fax: +91 824 247 4033, E-mail:

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Received: 2008-9-11
Accepted: 2010-4-28
Published Online: 2013-05-18
Published in Print: 2010-07-01

© 2010, Carl Hanser Verlag, München

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https://doi.org/10.3139/146.110350
Keywords for this article
Ductile iron; Austempering; Wear; Austenite

Articles in the same Issue

  1. Contents
  2. Contents
  3. Basic
  4. Thermodynamic modeling of the Pt–Zr system
  5. Experimental investigation and thermodynamic prediction of the Ga–Sb–Sn phase equilibria
  6. Calculation of the viscosity of the liquid ternary Ag–Au–Sn system
  7. Thermophysical properties of liquid tin–bismuth alloys
  8. A comparative AFM study of carbon alloyed Mo–Se–C and W–S–C films for tribological applications
  9. Luminescence of Fe-substituted ZnWO4 powders synthesized by aqueous solution reaction
  10. Electromagnetic radiation during plastic deformation under unrestricted quasi-static compression in metals and alloys
  11. Applied
  12. Microstructure and mechanical properties of Fe3Al–TiC composites
  13. Study of wear behaviour of ductile iron subjected to two step austempering
  14. Effect of annealing on formability and crystallographic textures of aluminium 5052 alloy sheets
  15. The use of fly ash and basaltic pumice as additives in the productionof clay fired brick in Turkey
  16. Insulation properties of bricks made with cotton and textile ash wastes
  17. Effects of homogenizing and aging treatments on the microstructure and microhardness of an Nb-silicide based ultrahigh temperature alloy
  18. Alloys with thermal expansion matching to electrolyte materials for solid oxide fuel cells
  19. Simulation-based study of the compensation coil method applied to ferrite nanometric powders
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