Metallurgical Transactions

, Volume 1, Issue 10, pp 2815–2823 | Cite as

Crystallography of the {225}F martensite transformation in an Fe−Mn−Cr−C alloy

  • S. Jana
  • C. M. Wayman


This paper reports on a study of the crystallography of the {225}F * martensite transformation in Fe-3 pct Mn-3 pct Cr-1 pct C for which the habit place was found to be indistinguishable from the (hkh)F form. The shape strain direction based on analysis of scratch displacements and surface tilts proved to be unique, in contrast to previous work, with a scatter of ≈5 deg about the mean direction. The habit plane was found to be invariant, or at most isotropically distorted by 1/2 pct, and thus the use of a dilatation parameter to explain the {225}F transformation is not considered to be feasible. The shape strain results clearly indicate the importance of making observations on bulk martensite plates. Nonparallelism of the austenite-martensite close-packed planes and directions for the {225}F transformation was confirmed by an orientation relationship measurement. The data have been used to test recent crystallographic proposals for the {225}F transformations and some preliminary calculations suggest the need for either additional considerations or a new theoretical approach.


Austenite Martensite Habit Plane Martensite Plate Shape Strain 
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Copyright information

© The Minerals, Metals & Materials Society - ASM International - The Materials Information Society 1970

Authors and Affiliations

  • S. Jana
    • 1
  • C. M. Wayman
    • 2
  1. 1.Cummins Engine Co.Columbus
  2. 2.Department of Metallurgy and Mining EngineeringUniversity of Illinois at Urbana-ChampaignUrbana-ChampaignUSA

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