Abstract
This investigation reports on an optical and electron microscope study of bct martensite formed in Fe-7 pct Al-1.5 pct C and Fe-7 pct Al-2.0 pct C alloys. In each case the martensite is plate-like containing\((112)[\bar 1\bar 11]\) transformation twins 100 to 200Å in width. The particular twin plane variant\((112)[\bar 1\bar 11]\) corresponds to the martensite habit plane variant (3, 15, 10)F, which is predicted by the crystallography theory. The twins are uniformly spaced and extend completely from one martensite-austenite interface to the other as would be theoretically expected. The martensite plates are ideally lenticular in the 2 pct C alloy but those in the 1.5 pct C alloy frequently exhibit irregular interfaces which are attributed to impingement effects. All observations are in accordance with the phenomenological crystallography theory as applied to ferrous martensites with a {3, 15, 10}F habit plane.
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M. WATANABE, formerly Research Assistant at the University of Illinois at Urbana-Champaign, Urbana, Ill.
This paper is based upon a thesis submitted by M. WATANABE in partial fulfillment of the requirements of the degree of Doctor of Philosophy at the University of Illinois at Urbana-Champaign.
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Watanabe, M., Wayman, C.M. The morphology and substructure of highly tetragonal martensites in Fe-7 pct Al−C steels. Metall Trans 2, 2221–2227 (1971). https://doi.org/10.1007/BF02917554
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DOI: https://doi.org/10.1007/BF02917554