Paper Title:
Cooling Rate Dependent Morphology of the γ' Precipitates in Nickel-Base Superalloy Udimet 500
  Abstract

The morphology of the γ΄ precipitates during continues cooling of a nickel-base superalloy, Udimet 500, was studied using scanning electron microscopy and X-ray diffraction technique. The samples were full solutioned at 1200oC and then were cooled to ambient temperature under different cooling rates, 15, 1, 0.2, 0.05oC/min and air cooling. The unconstrained γ-γ΄ misfit values for each sample were calculated using the electrolytic extracted γ΄ precipitates. According to the results, by decreasing the cooling rate, not only the size, volume fraction and interparticle spaces of the  precipitates were increased, but also depending on the γ-γ΄ lattice misfits the corresponding  morphology was changed from spherical to cubic, then flower-like and finally dendritic shape. The observations are discussed in view of the compositional changes of γ/γ΄ phases and elastic strain considerations of their interfaces which will be described in detail in the article.

  Info
Periodical
Edited by
M. Heilmaier
Pages
108-113
DOI
10.4028/www.scientific.net/AMR.278.108
Citation
M. K. Savadkoohi, A. Samadi, R. Salehi, "Cooling Rate Dependent Morphology of the γ' Precipitates in Nickel-Base Superalloy Udimet 500", Advanced Materials Research, Vol. 278, pp. 108-113, 2011
Online since
July 2011
Export
Share

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

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

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: Coraline Crozet, Annie Antoni Zdziobek, Sabine Lay, Stéphane Coindeau
Abstract:Austenite/ferrite phase transformations in Fe-xCu-10Ni alloys, 0<x<15 (mass%), are studied under two different cooling conditions,...
505
Authors: Xin Jie Di, Dan Xu, Yong Chang Liu
Chapter 3: Materials Forming, Machining and Joining
Abstract:The microstructure and carbide precipitate of simulated coarse grain heat affected zone(CGHAZ) in modified high Cr ferritic heat-resistant...
1320
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