MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
High-Resolution Electron Microscopic Study on Atomic Arrangements at Growing Tips of Martensite Plates and a Nucleating Martensite in Fe-Ni-Mn and Fe-Cr-C Alloys
K. OgawaS. Kajiwara
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2007 年 48 巻 4 号 p. 860-868

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The present work aims to clarify the atomic arrangements at the austenite/martensite interfaces for the nucleating martensite and the growing tip of martensite plates. An Fe-23Ni-3.8Mn alloy and an Fe-9Cr-1.1C alloy with the K-S orientational relationship with the {112} habit plane were observed with high resolution electron microscopy. At the very tip of the wedge-shaped growing martensite, dislocations queue up on about every six (111)f layers along the interface, with their extra-half plane in the austenite. A nucleus of the martensite was observed in the Fe-9Cr-1.1C alloy. The nucleus has the K-S orientational relationship with a habit plane of (111)f(||(011)b), a wing-like shape, and remarkably expands in the direction of [\\bar101]f(||[\\bar1\\bar11]b). The crystal structure of the nucleus shows a transient lattice region from fcc to bct toward the inside, and the transformation into the final martensite structure (bct) is still incomplete even at the center of the nucleus.

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© 2007 The Japan Institute of Metals and Materials
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