Hot working behavior of extruded powder products of B2 iron aluminide alloys

Prasad, Y. V. R. K. ; Sastry, D. H. ; Deevi, S. C. (2001) Hot working behavior of extruded powder products of B2 iron aluminide alloys Materials Science and Engineering A, 311 (1-2). pp. 42-53. ISSN 0921-5093

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Official URL: http://linkinghub.elsevier.com/retrieve/pii/S09215...

Related URL: http://dx.doi.org/10.1016/S0921-5093(01)00909-1

Abstract

The characteristics of hot deformation of hot extruded B2 type iron aluminide alloy powders produced by gas-atomization and water-atomization techniques have been studied using compression tests in the temperature range 850–1150°C and true strain rate range 0.001–100 s−1. At strain rates higher than about 1 s−1, the materials exhibited flow softening type of stress–strain curves, while at lower strain rates, the flow curves were of steady-state type. The apparent activation energy for hot deformation has been evaluated and is in the range 430–465 kJ mole−1 both in the gas-atomized and water-atomized materials. The processing map for the gas-atomized material revealed that dynamic recrystallization occurs in wide ranges of temperature and strain rate with its optimum at 1075°C and 0.1 s−1. However, in the case of water-atomized material, the features in the processing map have changed with strain. The gas-atomized material is prone to flow instabilities like flow localization at strain rates higher than 10 s−1, while the water-atomized material exhibits stable flow even at high strains and high strain rates.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
Keywords:Iron Aluminide; Hot Working; Processing Maps; Dynamic Recrystallization; Superplasticity; Flow Localization
ID Code:37944
Deposited On:30 Apr 2011 08:06
Last Modified:30 Apr 2011 08:06

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