Austenite memory during reverse transformation of steels at different heating rates

Saito, Genki; Nakayama, Tomoya; Sakaguchi, Norihito; Ohno, Munekazu; Matsuura, Kiyotaka; Takeuchi, Masayoshi; Sano, Taichi; Minoguchi, Koki; Yamaoka, Takuya

Austenite memory during reverse transformation of steels at different heating rates

Saito, Genki; Nakayama, Tomoya; Sakaguchi, Norihito et al.

Materialia, 2019, 7, UNSP 100409

Permalink : https://hdl.handle.net/2115/82574

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アクセス権	open access
URI	https://hdl.handle.net/2115/82574
タイトル	Austenite memory during reverse transformation of steels at different heating rates
著者	Saito, Genki ; Nakayama, Tomoya ; Sakaguchi, Norihito ; Ohno, Munekazu ; Matsuura, Kiyotaka ; Takeuchi, Masayoshi ; Sano, Taichi ; Minoguchi, Koki ; Yamaoka, Takuya
e-Rad_Researcher 00749278 著者名 Saito, Genki
著者名 Nakayama, Tomoya
e-Rad_Researcher 70344489 著者名 Sakaguchi, Norihito
e-Rad_Researcher 30431331 著者名 Ohno, Munekazu
e-Rad_Researcher 60142692 著者名 Matsuura, Kiyotaka
著者名 Takeuchi, Masayoshi
著者名 Sano, Taichi
著者名 Minoguchi, Koki
著者名 Yamaoka, Takuya
言語	英語
キーワード	Transformation
	Grain refinement
	Orientation relationship
	Ferritic steels
	EBSD
	Crystallographic orientation
発行日	2019-09
出版者	Elsevier
収録物名	Materialia
巻(号)	7
ページ	UNSP 100409
抄録	The austenite (gamma) structure reversely transformed from martensite in Fe-0.55C mass% C alloy was investigated at high temperatures using in-situ an electron backscatter diffraction (EBSD) method. When the heating rate was varied, a rapidly heating produced fine gamma grains, in contrast, a slow heating induced coarse gamma grains having the same crystal orientations as those of the prior gamma grains; known as "gamma memory". The most likely mechanism for the gamma memory could be variant restrictions owing to cementite (theta). To investigate the effect of theta on the gamma memory, the sample was tempered at 700 degrees C for 24 h and theta was precipitated. The tempered sample exhibited the gamma memory irrespective of the heating rate. To clarify the origin of the gamma memory, we focused on the reversely transformed gamma formed adjacent to the theta and directly observed the orientation relationships (ORs) using the in-situ EBSD. A crystallographic analysis on the between neighboring ferrites (alpha), theta, and gamma revealed the existence of Kurdjumov-Sachs OR between gamma and two alpha (alpha 1 and alpha 2), Isaichev OR between alpha and theta, and Pitsch OR between theta and gamma. In the all possible combinations, the reversely transformed gamma satisfying the K-S OR for two alpha variants was limited to four variants. The theta variant satisfying the Isaichev OR for alpha 1 and alpha 2 was limited to one variant, which was close to one of the four variants by Pitsch OR, which suggests the gamma memory is due to these variant restrictions among alpha-theta-gamma.
資源タイプ	学術雑誌論文
出版タイプ	Accepted Manuscript
権利情報	Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
権利情報	©2020. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
PISSN	2589-1529
関連情報 (isVersionOf)	出版社版DOI https://doi.org/10.1016/j.mtla.2019.100409