Some Behaviors of Phosphorus in Several Typical Superalloys

Abstract:

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The effect of phosphorus in some typical wrought superalloys including IN718, GH761 and GH4133 has been studied. Phosphorus was not dissolved in the γ matrix of superalloys and was segregated in the residual liquids seriously during solidification, and the solidification of the alloys added with phosphorus was always finished by the precipitation of a phosphorus bearing phase. Two factors controlling the segregation tendency of a minor element were determined, one is the solubility of the element in the matrix, another is the precipitation temperature of a phase in which the element is absorbed. The detrimental effect of phosphorus on the solidification could be eliminated by a proper homogenization treatment. Phosphorus improved the stress rupture properties of the alloys with a fine grain structure. By combining the grain refinement with phosphorus addition, the properties of GH761 alloy was improved efficiently.

Info:

Periodical:

Materials Science Forum (Volumes 539-543)

Main Theme:

Edited by:

T. Chandra, K. Tsuzaki, M. Militzer , C. Ravindran

Pages:

3053-3058

DOI:

10.4028/www.scientific.net/MSF.539-543.3053

Citation:

W. R. Sun et al., "Some Behaviors of Phosphorus in Several Typical Superalloys", Materials Science Forum, Vols. 539-543, pp. 3053-3058, 2007

Online since:

March 2007

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Price:

$35.00

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