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High Temperature Materials and Processes

Editor-in-Chief: Fukuyama, Hiroyuki

Editorial Board: Waseda, Yoshio / Fecht, Hans-Jörg / Reddy, Ramana G. / Manna, Indranil / Nakajima, Hideo / Nakamura, Takashi / Okabe, Toru / Ostrovski, Oleg / Pericleous, Koulis / Seetharaman, Seshadri / Straumal, Boris / Suzuki, Shigeru / Tanaka, Toshihiro / Terzieff, Peter / Uda, Satoshi / Urban, Knut / Baron, Michel / Besterci, Michael / Byakova, Alexandra V. / Gao, Wei / Glaeser, Andreas / Gzesik, Z. / Hosson, Jeff / Masanori, Iwase / Jacob, Kallarackel Thomas / Kipouros, Georges / Kuznezov, Fedor


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Open Access
Online
ISSN
2191-0324
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Volume 30, Issue 1-2

Issues

High-Temperature Tensile Creep Behavior of A [001] Orientation Single Crystal Nickel-Base Superalloy

Y. Su
  • College of Mechanical Engineering, Shenyang University of Chemical Technology, 110142 Shenyang, China
  • School of Materials Science and Engineering, Shenyang University of Technology, 110870 Shenyang, China
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/ S. G. Tian
  • Corresponding author
  • School of Materials Science and Engineering, Shenyang University of Technology, 110870 Shenyang, China
  • Email
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/ L. L. Yu
  • School of Materials Science and Engineering, Shenyang University of Technology, 110870 Shenyang, China
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/ H. C. Yu / S. Zhang
  • School of Materials Science and Engineering, Shenyang University of Technology, 110870 Shenyang, China
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/ B. J. Qian
  • School of Materials Science and Engineering, Shenyang University of Technology, 110870 Shenyang, China
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Published Online: 2011-04-19 | DOI: https://doi.org/10.1515/htmp.2011.022

Abstract

By means of the measurement of creep curves and microstructure observation, an investigation has been made into the microstructure evolution of γ′ phase in [001] orientation single crystal nickel-base superalloy during tensile creep. Results show that, after full heat treatment, the microstructure of the single crystal nickel-base superalloy consists of the cubical γ′ phase embedded coherently in the γ matrix, and arranged regularly along the 〈100〉 orientations. During tensile creep, the cubical γ′ phase in the alloy is transformed into the rafted structure along the direction vertical to the applied stress axis. During steady state creep, the strain rate of the single crystal nickel-base superalloy is controlled by the climbing of dislocations in the ranges of the applied temperatures and stresses. After crept up to fracture, various morphologies of the rafted γ′ phase are displayed in different regions of the specimen, and the coarsening and twist extent of the rafted γ′ phase increase as the distance from the fracture decreases, which is attributed to the increment of the effective stress and strain extent in the necked region.

Keywords.: Single crystal nickel-base superalloy; tensile creep; microstructure evolution

About the article

Corresponding author: S. G. Tian, School of Materials Science and Engineering, Shenyang University of Technology, 110870 Shenyang, China


Received: 2010-10-26

Accepted: 2010-11-12

Published Online: 2011-04-19

Published in Print: 2011-04-01


Citation Information: High Temperature Materials and Processes, Volume 30, Issue 1-2, Pages 151–156, ISSN (Online) 2191-0324, ISSN (Print) 0334-6455, DOI: https://doi.org/10.1515/htmp.2011.022.

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