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The influence of plastic strain upon the aging characteristics of alloys

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Abstract

The conditions under which dislocations can influence the decomposition of supersaturated solid solutions with different degrees of supersaturation are discussed. It is shown that the major effects are associated with the formation of intermediate precipitates and with low degrees of super saturation. Examples are then given of the effects of prior plastic strain upon aging reactions in aluminum, nickel and copper based alloys. The changes in mechanical properties are related to the observed changes in microstructure. It is argued that with martensitic steels the tempering reactions are not influenced by prior plastic strain, since the dislocation density is already high as a result of the martensitic reaction; however plastic strain after initial temper, followed by a further temper can produce marked changes in structure and properties. It is shown that in general prior plastic strain can considerably shorten the time cycle for heat treatment and it may at the same time induce improved mechanical properties.

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Authors and Affiliations

  1. Department of Metallurgy, Houldsworth School of Applied Science, The University, Leeds, England

    J. Nutting

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  1. J. Nutting
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Additional information

This paper is based on a presentation made at a symposium on Altering the Time Cycle of Heat Treatment, held at the Philadelphia meeting of The Metallurgical Society of AIME, October 14, 1969, under the sponsorship of the IMD Heat Treatment Committee.

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Nutting, J. The influence of plastic strain upon the aging characteristics of alloys. Metall Trans 2, 45–51 (1971). https://doi.org/10.1007/BF02662637

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  • DOI: https://doi.org/10.1007/BF02662637

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