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RESEARCH PAPERS

The Creep-Rupture Properties of 80 Ni-20 Cr Alloys

[+] Author and Article Information
Robert Widmer

M.I.T.; New England Materials Laboratory, Inc., Medford, Mass.

Nicholas J. Grant

Department of Metallurgy, Massachusetts Institute of Technology, Cambridge, Mass.

J. Basic Eng 82(4), 829-838 (Dec 01, 1960) (10 pages) doi:10.1115/1.3662778 History: Received July 17, 1959; Online November 04, 2011

Abstract

The creep-rupture properties and the creep behavior of a series of 80 Ni-20 Cr alloys were investigated over the 1200 to 1800-F range. In the group were two vacuum-melted and three air-melted alloys. Among these five heats there were small but important differences in minor constituents such as silicon, manganese, sulfur, and possible tramp elements, primarily as a result of the melting practice in each case. Of particular interest in this study was the variation in ductility which the various alloys exhibited in creep-rupture tests which lasted from a few minutes to more than 1000 hr. A close examination of ductility behavior was undertaken by breaking down the creep curve into primary, secondary, and third-stage creep as a function of stress and temperature. It is shown that the stress-rupture properties are not affected over a wide temperature and stress range by a change in minor constituents, whereas the ductility behavior can vary considerably.

Copyright © 1960 by ASME
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