Effect of Delta Phase on the Hot Deformation Behaviour and Microstructural Evolution of Inconel 718

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In order to investigate the influence of -phase precipitation during high temperature forging of Inconel 718, hot axi-symmetric compression tests have been performed on specimens with two distinct initial microstructures: i) as-received material containing a dense population of  precipates at grain boundaries and along intragranular slip planes, and ii) material solution-treated to dissolve the  phase. Results indicate that the presence of  leads to a slight increase in peak stress and a proportionately greater post-peak reduction in flow stress, as compared to solution-treated material. For both types of microstructure flow softening is associated with grain refinement, but in different ways: in -free material conventional dynamic recrystallisation leads to the formation of new grains, whereas the presence of plate-like  appears to cause the mechanical break-up and segmentation of prior grains.

Info:

Periodical:

Advanced Materials Research (Volumes 89-91)

Edited by:

T. Chandra, N. Wanderka, W. Reimers , M. Ionescu

Pages:

313-318

DOI:

10.4028/www.scientific.net/AMR.89-91.313

Citation:

H. M. Lalvani et al., "Effect of Delta Phase on the Hot Deformation Behaviour and Microstructural Evolution of Inconel 718", Advanced Materials Research, Vols. 89-91, pp. 313-318, 2010

Online since:

January 2010

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$35.00

[1] R.C. Reed: The Superalloys - Fundamentals and Applications (Cambridge University Press, New York 2006).

[2] A.A. Guimares and J.J. Jonas: Met. Trans. A, Vol. 12, pp.1655-1666 (1981).

[3] L.X. Zhou and T.N. Baker: Mater. Sci. Eng. A, Vol. 177, pp.1-9 (1994).

[4] A.J. Brand, K. Karhausen and R. Kopp: Mater. Sci. Technol., Vol. 12, pp.963-969 (1996).

[5] S.C. Medieros, Y.V.R.K. Prasad, W.G. Frazier and R. Srinivasan: Mater. Sci. Eng. A, Vol. 293, pp.198-207 (2000).

[6] M.J. Donachie and S.J. Donachie: Superalloys - A Technical Guide (ASM International, Ohio, 2002).

[7] H. Yuan and W.C. Liu: Mater. Sci. Eng. A, Vol. 408, pp.281-289 (2005).

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