Paper Title:
The Effect of Grain Refinement and Cooling Rate on the Hot Tearing of Wrought Aluminium Alloys
  Abstract

Using modifications to the Rappaz-Drezet-Gremaud hot tearing model, and using empirical equations developed for grain size and dendrite arm spacing (DAS) on the addition of grain refiner for a range of cooling rates, the effect of grain refinement and cooling rate on hot tearing susceptibility has been analysed. It was found that grain refinement decreased the grain size and made the grain morphology more globular. Therefore refining the grain size of an equiaxed dendritic grain decreased the hot tearing susceptibility. However, when the alloy was grain refined such that globular grain morphologies where obtained, further grain refinement increased the hot tearing susceptibility. Increasing the cooling decreased the grain size and made the grain morphology more dendritic and therefore increased the likelihood of hot tearing. The effect was particularly strong for equiaxed dendritic grain morphologies; hence grain refinement is increasingly important at high cooling rates to obtain more globular grain morphologies to reduce the hot tearing susceptibility.

  Info
Periodical
Materials Science Forum (Volumes 519-521)
Edited by
W.J. Poole, M.A. Wells and D.J. Lloyd
Pages
1675-1680
DOI
10.4028/www.scientific.net/MSF.519-521.1675
Citation
M. Easton, J. F. Grandfield, D. H. StJohn, B. Rinderer, "The Effect of Grain Refinement and Cooling Rate on the Hot Tearing of Wrought Aluminium Alloys", Materials Science Forum, Vols. 519-521, pp. 1675-1680, 2006
Online since
July 2006
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: M.R. Chavez, A. Amaro, C. Flores, A. Juarez, Carlos González-Rivera
Abstract:The purpose of this work is to analyze the capability of Newton Thermal Analysis (NTA) to detect differences of the solidification kinetics...
153
Authors: Jana Dobrovská, Simona Dočekalová, Věra Dobrovská, Karel Stránský
Abstract:The paper deals with the effect of cooling rate on solidification behavior of IN 738LC nickel based superalloy and on resulting structural...
201
Authors: Torbjörn Carlberg
Abstract:The formation of polyhedral silicon crystals in aluminium 7-9% silicon alloys has been studied both in industrial ingots and in simulation...
307
Authors: M. Paliwal, Dae H. Kang, Elhachmi Essadiqi, In Ho Jung
Chapter 10: Magnesium Alloys
Abstract:Although numerous solidification experiments have been conducted for Al, Cu and Si alloys to investigate microstructural features like...
362
Authors: Peng Xiao, Xiao Yu Zhang, Hong Wei Lu
Chapter 1: Materials Science
Abstract:Cu-1.37Cr alloy powders were prepared by gas atomization process, and the cooling rates of alloy powders were calculated through the...
60