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Influence of thermo-mechanical treatment on the precipitation strengthening behavior of Inconel 740, a Ni-based superalloy

Published online by Cambridge University Press:  27 April 2011

Jun-Hak Oh ,
Byung-Gil Yoo ,
In-Chul Choi ,
Michael L. Santella  and
Jae-il Jang
Jun-Hak Oh
Affiliation:
Division of Materials Science and Engineering, Hanyang University, Seoul 133-791, Korea
Byung-Gil Yoo
Affiliation:
Division of Materials Science and Engineering, Hanyang University, Seoul 133-791, Korea
In-Chul Choi
Affiliation:
Division of Materials Science and Engineering, Hanyang University, Seoul 133-791, Korea
Michael L. Santella
Affiliation:
Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
Jae-il Jang*
Affiliation:
Division of Materials Science and Engineering, Hanyang University, Seoul 133-791, Korea
*
a)Address all correspondence to this author. e-mail: jijang@hanyang.ac.kr
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Abstract

In this work, we have systematically explored the influence of thermo-mechanical treatment on the precipitation behavior and its strengthening in Inconel 740, a relatively new Ni-based superalloy, using specimens on which different levels of stresses were applied at 700 °C. With increasing applied stress, fraction of gamma prime precipitates increased (without significant size change) and nanoindentation hardness was enhanced. The stress effects were discussed in terms of the free energy barrier for heterogeneous nucleation and the prevailing mechanisms of precipitation strengthening.

Keywords

StrengthNanoindentationNi
Type
Articles
Information
Journal of Materials Research , Volume 26 , Issue 10 , 28 May 2011 , pp. 1253 - 1259
Copyright
Copyright © Materials Research Society 2011

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