Microstructural validation of processing maps using the hot extrusion of P/M Nimonic AP-1 superalloy

Somani, MC and Birla, NC and Prasad, YVRK and Singh, V (1995) Microstructural validation of processing maps using the hot extrusion of P/M Nimonic AP-1 superalloy. In: Journal of Materials Processing Technology, 52 (2-4). pp. 225-237.

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Abstract

The microstructural features of hot-extruded Nimonic AP-1 superalloy powder are presented in this paper. Experiments have been designed to validate the processing maps of Nimonic AP-1 microstructurally using a commercial extrusion process. The time average mean strain rate\xi t, has been used as the basis for selection of the extrusion parameter viz., ram speed and extrusion ratio. Extrusion was conducted under non-isothermal conditions. The microstructural evaluation of the material extruded in the dynamic recrystallization (DRX) domain of the processing map exhibited homogeneous deformation and a recrystallized structure, free from cracks and shear bands. Adiabatic shear bands and inter-crystalline cracks seen in the microstructures of other extruded products have been correlated accurately with the instability and cracking regimes of the processing map.

Item Type:	Journal Article
Publication:	Journal of Materials Processing Technology
Publisher:	Elsevier B.V.
Additional Information:	The copyright belongs to Elsevier B.V.
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	27 Jun 2008
Last Modified:	19 Sep 2010 04:46
URI:	http://eprints.iisc.ac.in/id/eprint/14436

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