Metallurgical and Materials Transactions B

, Volume 2, Issue 8, pp 2221–2227 | Cite as

The morphology and substructure of highly tetragonal martensites in Fe-7 pct Al−C steels

  • M. Watanabe
  • C. M. Wayman
Alloy Phases and Structure


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.


Austenite Martensite Habit Plane Martensite Plate Irregular Interface 
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Copyright information

© ASM International & TMS-The Minerals, Metals and Materials Society 1971

Authors and Affiliations

  • M. Watanabe
    • 1
  • C. M. Wayman
    • 2
  1. 1.Central Research Institute of the Furukawa Electric Company, Ltd.TokyoJapan
  2. 2.the University of Illinois at Urbana-ChampaignUrbana-ChampaignUSA

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