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Direct decomposition of austenite in two Fe-V-C alloys

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Abstract

Investigations of austenite decomposition have been undertaken in (1) Fe-0.5Mn-1V-0.2C and (2) Fe-0.5Mn-3Ni-1V-0.2C alloys. Isothermal transformation characteristics were determined using dilatometric and thermo-electric potential techniques. Also, micro-structural features were observed using optical and transmission electron microscopy for treatments of interest following isothermal austenite decomposition in the 550 to 750° C range. Associated mechanical properties were measured with emphasis being placed on Charpy impact behavior. Both alloys exhibited two temperature regions in which “C-curve” austenite decomposition occurred. In the upper region a combination of fibrous and fine particle VC precipitation was observed in both alloys. In the lower transformation region, bainitic microstructures resulted from the isothermal treatments. Additionally, the alloy containing 3 pct Ni exhibited VC precipitation in the austenite prior to ferrite formation. In both alloys, complete isothermal transformation produced microstructures with poor impact properties. However, a good combination of strength and toughness was produced in the 3 pct Ni alloy using the heat treatment that promoted VC precipitation in austenite but avoided total isothermal austenite decomposition.

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Authors and Affiliations

  1. Department of Materials Science and Mineral Engineering, University of California, Berkeley, 94720, Berkeley, CA

    Y. Mishima (Assistant Research Engineer), V. F. Zackay (Professor) & E. R. Parker (Professor Emeritus)

  2. General Electric Company, 175 Curtner Ave., G.E. Mail Code 511, 95125, San Jose, CA

    R. M. Horn

Authors
  1. Y. Mishima
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  2. R. M. Horn
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  3. V. F. Zackay
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  4. E. R. Parker
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Additional information

Formerly with University of California, Berkeley

This paper is based on a presentation made at a symposium on “Precipitation Processes in Structural Steels” held at the annual meeting of the AIME, Denver, Colorado, February 27 to 28, 1978, under the sponsorship of the Ferrous Metal-lurgy Committee of The Metallurgical Society of AIME.

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Mishima, Y., Horn, R.M., Zackay, V.F. et al. Direct decomposition of austenite in two Fe-V-C alloys. Metall Trans A 11, 431–440 (1980). https://doi.org/10.1007/BF02654567

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