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RESEARCH PAPERS

Embrittlement of Precipitation Hardenable Nickel-Base Alloys by Oxygen

[+] Author and Article Information
M. Prager

Copper Development Association, New York, N. Y.

G. Sines

Materials Department, School of Engineering and Applied Science, University of California, Los Angeles, Calif.

J. Basic Eng 93(2), 225-230 (Jun 01, 1971) (6 pages) doi:10.1115/1.3425217 History: Received November 16, 1970; Online October 27, 2010

Abstract

A study was made of the embrittling effects of oxygen on René 41, a nickel-base alloy hardened by precipitation of gamma prime. In short time tensile tests in air it was found that from 750 to 900 deg C oxygen promoted initiation and rapid propagation of intergranular cracks, while in the absence of oxygen, tensile fractures were transgranular and ductility was much improved. Sensitivity to embrittlement by oxygen decreases with coarsening of gamma prime. When gamma prime is hyperfine, probably less than 100 Å, embrittlement is greatest and follows the predictions of a Petch-Stroh model for the initiation of cracks ahead of pile-ups of dislocations. In accordance with the model, the ductility of René 41 increased in proportion of the reciprocal of the square roo of grain size. Calculated on the basis of the model, the surface energy of René 41 in air was 400 ergs/cm2 , considerably lower than would be expected for an alloy of nickel in an inert atmosphere.

Copyright © 1971 by ASME
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