Tetsu-to-Hagane
Online ISSN : 1883-2954
Print ISSN : 0021-1575
ISSN-L : 0021-1575
Effect of Heat-Treatment on Mechanical Properties of Nimonic 80A
Studies on nickel-base heat-resisting alloys-II
Taro Hasegawa
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1959 Volume 45 Issue 2 Pages 123-127

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Abstract

Effect of heat treatment on mechanical properties of Nimonic 80A were investigated. As the heat treatment containing water-cooling after solution-treatment gave fine precipitated microstructure, specimens heat treated by that method have higher short time tensile strength up to 800°C and hardness, and Charpy impact value is lower than those air cooled after solution treatment. Stress-rupture life at 750°C of the specimens water-cooled after solution-treatment was inferior to the specimens air-cooled after solution-treatment, because the former tends to soften during stress rupture testing.
Aging treatment at 750°C gave maximum aging hardness, but aging treatment at 700°C gave maximum stress-rupture life at 750°C, comparing with the aging between 700° and 850°C. It is because precipitation around grain boundary during stress-rupture testing became remarkable by aging above 700°C.
In carbide-precipitation type alloys, tensile strength and stress-rupture life became longer by precipitation-hardening during tensile test and stress-rupture testing at high temperature, but in Nimonic 80A, tensile strength and stress-rupture life of specimens as solution-treated were inferior to aged specimens.

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© The Iron and Steel Institute of Japan
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