International Journal of
Physical Sciences

  • Abbreviation: Int. J. Phys. Sci.
  • Language: English
  • ISSN: 1992-1950
  • DOI: 10.5897/IJPS
  • Start Year: 2006
  • Published Articles: 2572

Full Length Research Paper

Effects of annealing parameters on grain-growth behavior of HAYNES®-718 superalloy

Zainul Huda1*, Tuan Zaharinie2 and Syed Humailul Islam1
  1College of Engineering, King Saud University, Riyadh, Saudi Arabia. 2Department of Mechanical Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia.
Email: [email protected]

  •  Accepted: 26 September 2011
  •  Published: 23 November 2011

Abstract

 

Annealing heat-treatment experiments at temperatures in the range of 1050 to 1150°C (1323 to 1423K) for durations in the range of 20 min to 22 h were conducted for HAYNESÒ718 superalloy plate. Grain sizes for the as-received and the annealed samples of the superalloy were measured by application of quantitative metallographic techniques. The grain-growth exponents, n, for the kinetic relationship (dD/dt = ktn) were then computed, and the n values were found to lie in the range of 0.067 to 0.183. The microstructures of the as-received and annealed samples were critically compared for applications of the superalloy at high temperatures.

 

Key words: Superalloy, grain growth, kinetics, microstructure, gas-turbines.