SEDL / STP / STP174-EB / STP44985S

Effect of Heat Treatment and Structure Upon Creep Properties of Nimonic Alloys Between 750 and 950 C

Betteridge, W.
The Mond Nickel Co., Ltd., Birmingham,

Smith, R. A.
The Mond Nickel Co., Ltd., Birmingham,

Pages: 11    Published: Jan 1956

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Abstract

Tests on nickel-chromium-cobalt alloys hardened with titanium and aluminum have shown that differences in the stress-rupture properties at 750 C, whether due to differences in content of hardening elements or to differences in heat treatment, are maintained at all temperatures up to 950 C.

Results are also presented for a cobalt-free alloy of comparable type. These show that the 100- and 300-hr rupture stresses decrease smoothly with increase of temperature up to 950 C. The absence of a discontinuity in the region of the temperature at which the hardening phase is completely soluble can be interpreted as showing that rupture strength is a consequence of both precipitation and solid-solution hardening.