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Early stages of aging and tempering of ferrous martensites

Metallurgical Transactions A volume 14, pages 1057–1065 (1983)Cite this article

Abstract

The early stages of aging/tempering of ferrous martensites have been studied over a wide range of carbon contents by numerous experimental techniques. A kinetic framework is presented which allows a correlation of many diverse observations. Three general regimes of structural change termed relaxation, aging, and tempering can be further subdivided, thus identifying two stages of aging (Al and A2) which precede the conventional stages of tempering (T1-T3). The first stage of aging involves clustering of carbon atoms in c-oriented octahedral sites, while the second stage is associated with a modulated tweed microstructure containing high-carbon regions which may be interpreted as either advanced carbon clusters or coherent transition carbides. Alloy compositions are proposed to better correlate future complementary experiments required to determine these unus11Al structures more precisely.

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Authors and Affiliations

  1. Principal Research Associate, Institute Professor Emeritus, Massachusetts Institute of Technology, 02139, Cambridge, MA

    G. B. Olson & Morris Cohen

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  1. G. B. Olson
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  2. Morris Cohen
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Olson, G.B., Cohen, M. Early stages of aging and tempering of ferrous martensites. Metall Mater Trans A 14, 1057–1065 (1983). https://doi.org/10.1007/BF02670444

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Keywords

  • Austenite
  • Martensite
  • Metallurgical Transaction
  • Carbon Cluster
  • Resistivity Curve