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Home  >  Journal list  >  MATERIALS TRANSACTIONS  >  Vol.55  No.2 (2014)  >  pp.255-263

MATERIALS TRANSACTIONS
<<Previous article Vol.55  No.2 (2014)   pp.255 - 263 Next article>>

Dynamic Recrystallization Behavior of Waspaloy during Hot Working

Takanori Matsui1)
1) MMC Superalloy Corporation

Ni base superalloy is one of the most important key materials for hot section parts in various applications. As for cast and wrought material, it is well known that grain size distribution and recrystallization ratio as well as precipitation condition have considerable effect on mechanical properties. The deformation and dynamic recrystallization behavior of representative Ni base superalloy, Waspaloy were revealed through various kinds of hot compression tests and quantitative relationship available for numerical calculation technology was derived. Dynamically recrystallized grain diameter depended on temperature, strain rate and was independent of the initial grain diameter and strain. The grain diameter could be expressed as a function of the temperature compensated strain rate, i.e., Zener–Hollomon parameter quantitatively. Avrami-type equation was available for comprehensive and quantitative expression of dynamic recrystallization transition. The approximation was a function of the given strain and strain for the 50% recrystallization which depends on the initial grain diameter and Zener–Hollomon parameter.


Keyword:
superalloy, isothermal compression, hot deformation, peak stress, Zener–Hollomon parameter, dynamic recrystallization, dynamically recrystallized grain diameter, dynamic recrystallization ratio, numerical calculation

Received: October 07, 2013
Accepted: November 19, 2013 , Published online: January 25, 2014
Copyright © 2014 The Japan Institute of Metals and Materials

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