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Effects of Fine Precipitates on Austenite Grain Refinement of Micro-alloyed Steel during Cyclic Heat Treatment

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Title: Effects of Fine Precipitates on Austenite Grain Refinement of Micro-alloyed Steel during Cyclic Heat Treatment
Authors: Saito, Genki Browse this author →KAKEN DB
Sakaguchi, Norihito Browse this author →KAKEN DB
Ohno, Munekazu Browse this author →KAKEN DB
Matsuura, Kiyotaka Browse this author →KAKEN DB
Takeuchi, Masayoshi Browse this author
Sano, Taichi Browse this author
Minoguchi, Koki Browse this author
Yamaoka, Takuya Browse this author
Keywords: grain refinement
reverse transformation
cyclic heat treatment
precipitation
Issue Date: 15-Nov-2019
Publisher: 一般社団法人 日本鉄鋼協会 (The Iron and Steel Institute of Japan)
Journal Title: ISIJ international
Volume: 59
Issue: 11
Start Page: 2098
End Page: 2104
Publisher DOI: 10.2355/isijinternational.ISIJINT-2019-153
Abstract: The effects of fine precipitates on the austenite grain refinement of micro-alloyed steel during cyclic heat treatment were investigated under different solution treatments. After three rounds of cyclic heat treatment of A(c3) and A(r3) transformations of the as-received steel rod with rapid heating and cooling, the austenite grain size was 3-10 mu m. On the other hand, three rounds of cyclic heat treatment after solution treatment at 1 300 degrees C reduced the austenite grain size to 2-5 mu m. The as-received sample included AIN-Ti(C,N)-MnS composite particles with a mean diameter of 30 nm and a number density of 11 mu m(-3), and the mean diameter did not change during cyclic heat treatment. Thus, it was considered that the reduction in austenite grain size without solution treatment was caused by the increase in the nucleation site of austenite phase with increasing number of cycles, due to the refinement of the prior austenite grains with martensitic structure during the cyclic heat treatment. When solution-treated at 1 300 degrees C, the AIN-Ti(C,N)-MnS composite particles were solved, and they were precipitated during the cyclic heat treatment with a mean diameter of 12 nm and an increased number density of 85 mu m(-3). Thus, it was considered that the further reduction in austenite grain size with solution treatment was caused by the pinning effect of the fine precipitates, in addition to the increase in the number of austenite phase nucleation sites with increasing number of heat treatment cycles.
Type: article
URI: http://hdl.handle.net/2115/76499
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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