Affiliation:
1. Tokyo Institute of Technology
2. Shimane University
3. Tohoku University
4. Nippon Steel Co. Ltd.
Abstract
This study investigated the substructure evolution in lenticular martensite. The
substructure of lenticular martensite changes from fine transformation twins in the midrib and
twinned region to a high density of dislocations in the untwinned region during growth. On the basis
of careful observation of the morphology and substructure of midrib and examination of the
stress-induced growth behavior of thin plate martensite, we concluded that the midrib in lenticular
martensite is thin plate martensite itself. Tangled and curved dislocations appeared near the
martensite-austenite boundary of the untwinned region in Fe-33Ni and in the entire untwinned region
in Fe-31Ni, because the martensite inherited the accommodation dislocations in the surrounding
austenite. The difference of Ms temperature causes the difference in the substructure between
Fe-33Ni and Fe-31Ni. The higher Ms temperature of Fe-31Ni induces the plastic deformation of the
surrounding austenite at an earlier stage of transformation, resulting in the appearance of tangled and
curved dislocations in the entire untwinned region.
Publisher
Trans Tech Publications, Ltd.
Subject
Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics,General Materials Science
Cited by
3 articles.
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