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Home  >  Journal list  >  MATERIALS TRANSACTIONS  >  Vol.49  No.6 (2008)  >  pp.1242-1248

MATERIALS TRANSACTIONS
<<Previous article Vol.49  No.6 (2008)   pp.1242 - 1248 Next article>>

The Origin of Midrib in Lenticular Martensite

Akinobu Shibata1), Toshio Murakami1), Shigekazu Morito2), Tadashi Furuhara3) and Tadashi Maki1)
1) Department of Materials Science and Engineering, Kyoto University
2) Department of Materials Science, Shimane University
3) Institute for Materials Research, Tohoku University


In the present paper, the origin of midrib in lenticular martensite is clarified by examining the similarity between midrib and thin plate martensite in detail and studying the stress-induced growth behavior of thin plate martensite at various temperatures. Although lenticular martensite, especially midrib, exhibits a zigzag array in general, some martensite plates which are branched or kinked were also observed as thin plate martensite. The substructure of midrib is completely twinned and the orientation relationship of midrib with respect to austenite is close to Greninger–Troiano relationship. These morphology, substructure and crystallographic features of midrib in lenticular martensite are quite similar to those of thin plate martensite. Furthermore, stress-induced growth behavior of thin plate martensite changes with deformation temperature. Thermally-transformed thin plate martensite grows keeping a thin plate shape when deformed at temperature close to the Ms temperature. However, it grows into a lenticular shape accompanying a substructure with a high density of dislocations after deformation at temperature much higher than Ms temperature. Therefore, it is concluded that midrib in lenticular martensite is thin plate martensite itself. The difference between lenticular martensite and thin plate martensite is only in their growth behaviors.


Keyword:
midrib, lenticular martensite, thin plate martensite, morphology, substructure, crystallographic features, stress-induced growth behavior

Received: November 26, 2007
Accepted: February 27, 2008 , Published online: May 25, 2008
Copyright (c) 2008 The Japan Institute of Metals

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