Microstructure and mechanical properties of ultrafine grained low carbon steel fabricated by conventional cold-rolling and annealing of martensite (martensite process)

R. Ueji, N. Tsuji, Y. Minamino, Yuichiro Koizumi

研究成果: Conference contribution

抄録

A new thermomechanical processing named the martensite process which can easily fabricate the ultrafine grained steels without severe plastic deformation was developed. In this process, martensite is used as the starting structure. The martensite starting structure was conventionally cold-rolled by various reductions and then annealed at various temperatures. The cold-rolled martensite mainly exhibited lamellar structure, which is typical in severely deformed materials. The area fraction of the lamellar structure increased and the mean spacing of the lamellar boundaries decreased with increasing the rolling reduction, accompanying significant strengthening. After subsequent annealing at warm temperatures, the lamellar structure turned to equiaxed ultrafine ferrite grains with carbides precipitated uniformly, and at higher temperatures conventional recrystallization occurred to form coarse grained structure. The recrystallization temperature became lower with increasing the rolling reduction. The specimen rolled to intermediate reduction (50%) performed the largest ductility keeping high strength around 900MPa after warm-temperature annealing.

本文言語English
ホスト出版物のタイトルUltrafine Grained Materials III
編集者Y.T. Zhu, T.G. Langdon, R.Z. Valiev, S. Lee Semiatin, al et al
ページ143-148
ページ数6
出版ステータスPublished - 2004 7月 14
イベントUltrafine Grained Materials III - Charlotte, NC., United States
継続期間: 2004 3月 142004 3月 18

出版物シリーズ

名前Ultrafine Grained Materials III

Other

OtherUltrafine Grained Materials III
国/地域United States
CityCharlotte, NC.
Period04/3/1404/3/18

ASJC Scopus subject areas

  • 工学(全般)

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