Effect of Long Range Order on the Stress Corrosion Susceptibility of a Nickel-33 at% Chromium Alloy
CORROSION2016Vol. 72(11), pp. 1433–1437
Citations Over TimeTop 14% of 2016 papers
George A. Young, David Morton, N. Lewis, Robert E. Morris, Joseph M. Pyle, Leland Barnard, R. Najafabadi
Abstract
Fracture mechanics based stress corrosion testing in high-temperature, high purity water was conducted on a Ni-33 at% Cr (30.7 wt%) binary alloy heat treated to produce different degrees of strength via long range order. The as-fabricated and 475°C/200 h aged samples did not exhibit stress corrosion cracking (SCC) at the test conditions (338°C, KI = 33 MPa√m, and 12 SCC H2/kg H2O), but the 475°C/2,000 h aged sample was susceptible. Similar to the effect of “cold work,” the increased hardness, higher strength, and decreased ductility associated with the development of the long range ordered Ni2Cr phase is detrimental to SCC resistance.
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