Internal Stress of Plate Martensite Depending on Aspect Ratio via fcc-hcp Martensitic Transformation in Metastable Austenitic Stainless Steels
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- Wada Yuki
- Department of Materials Science and Engineering, Tokyo Institute of Technology
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- Nakada Nobuo
- Department of Materials Science and Engineering, Tokyo Institute of Technology
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- Onaka Susumu
- Department of Materials Science and Engineering, Tokyo Institute of Technology
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Abstract
<p>Internal stress generated by athermal martensitic transformation from fcc (face-centered cubic) to hcp (hexagonal close-packed) was investigated in 18Cr–8Ni metastable austenitic stainless steel. Lattice parameter ratio of hcp-martensite, c/a, formed by subzero treatment was evaluated accurately by means of electron back scatter diffraction technique. The evaluation revealed that hcp-martensite surrounded by fcc-austenite matrix has obviously higher c/a compared with the reference value in the case when hcp-martensite exists in a single body, and the c/a is continuously increased with increasing the aspect ratio of the plate-shaped hcp-martensite. However, additional formation of martensite with bcc (body centered cubic) reduced the c/a of hcp-martensite suddenly. From the point of view of micromechanics, it can be concluded that internal stress is dynamically increased by the thickening of plate martensite on fcc-hcp martensitic transformation, and the subsequent hcp-bcc martensitic transformation is stimulated to accommodate the internal stress.</p>
Journal
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- MATERIALS TRANSACTIONS
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MATERIALS TRANSACTIONS 61 (1), 61-67, 2020-01-01
The Japan Institute of Metals and Materials
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Details 詳細情報について
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- CRID
- 1390846609787566208
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- NII Article ID
- 130007772512
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- NII Book ID
- AA1151294X
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- ISSN
- 13475320
- 13459678
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- NDL BIB ID
- 030154689
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- Text Lang
- en
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed