Cold Swaging, Recovery and Recrystallization of Oligocrystalline INCOLOY MA 956-Part I: Deformed State

Oxide dispersion strengthened (ODS) superalloys combine high temperature strength and excellent corrosion and oxidation resistances. INCOLOY MA 956 is an iron-based ODS superalloy containing about 1% (volume) of fine and uniformly dispersed Y2O3 particles in a ferritic matrix. In the present work a...

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Bibliographic Details
Published in:ISIJ International 2004/11/15, Vol.44(11), pp.1894-1901
Main Authors: Hupalo, Marcio Ferreira, Padilha, Angelo Fernando, Sandim, Hugo Ricardo Zschommler, Kliauga, Andrea Madeira
Format: Article
Language:English
Subjects:
Applied sciences
cold swaging
EBSD
Exact sciences and technology
INCOLOY MA 956
mechanical alloying
Metals. Metallurgy
microstructure
texture
work hardening
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Summary:Oxide dispersion strengthened (ODS) superalloys combine high temperature strength and excellent corrosion and oxidation resistances. INCOLOY MA 956 is an iron-based ODS superalloy containing about 1% (volume) of fine and uniformly dispersed Y2O3 particles in a ferritic matrix. In the present work a coarse-grained (oligocrystalline) bar of MA 956 alloy was cold deformed by rotary swaging to reductions in area of 20, 47, 61, and 72%. Microstructural characterization of deformed samples was performed using light optical microscopy (LOM), X-ray diffraction (XRD), electron backscatter diffraction (EBSD), and Vickers microhardness testing. The microstructure in the deformed state was found to be very inhomogeneous. Deformation bands were observed in all grains. The extent of deformation banding varies from grain to grain in terms of morphology and spacing. The deformation substructures were found to be very different in each grain. A sharp ‹110›-fiber texture was developed during plastic deformation becoming more pronounced with increasing strain.
ISSN:0915-1559
1347-5460
DOI:10.2355/isijinternational.44.1894