Martensite Nucleation at Grain Boundaries Containing Intrinsic Grain Boundary Dislocations
SCIE
SCOPUS
- Title
- Martensite Nucleation at Grain Boundaries Containing Intrinsic Grain Boundary Dislocations
- Authors
- Song, T; De Cooman, BC
- Date Issued
- 2014-01
- Publisher
- Nippon Tekko Kyokai/Iron and Steel Institute of Japan
- Abstract
- It is shown that grain boundaries containing intrinsic grain boundary dislocations act as preferential nucleation site for the martensitic transformation. The microstructure and crystallography of BCC alpha'-martensite formed in a sensitized AISI 304 stainless steel was studied in detail by means of convergent beam Kikuchi pattern analysis. The orientation relationship between martensite and austenite was determined to be Kurdjumov-Sachs type. The presence of intrinsic grain boundary dislocations was observed at a grain boundary 10.83 degrees from the exact Sigma 11 CSL boundary orientation, where a martensite nucleus formed by the faulting and extension of intrinsic grain boundary dislocations. The selection of the crystallographic variant for the martensite nucleus was not related to a reduction in interfacial energy at nucleation, nor was it related to the accommodation of transformation strain by easy slip in the austenite.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/14341
- DOI
- 10.2355/ISIJINTERNATIONAL.54.2394
- ISSN
- 0915-1559
- Article Type
- Article
- Citation
- ISIJ International, vol. 54, no. 10, page. 2394 - 2403, 2014-01
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