Metallurgical approaches for product development and process optimization

Manabu Takahashi, Natsuko Sugiura, Yoshiyuki Ushigami, Takuya Hara, Ryuji Uemori, Hiroyuki Shirahata, Masaki Mizoguchi, Akihiro Uenishi, Kazuhiro Kojima

研究成果: ジャーナルへの寄稿総説査読

1 被引用数 (Scopus)


Bainite transformation progresses with the nucleation accompanying carbon diffusion and the growth without carbon diffusion, and the increase in volume fraction is due to the successive nucleation of sub-units whose size depends on the transformation temperature and austenite strength. The heat-affected zone (HAZ) is susceptible to deterioration in toughness since the fine microstructure imparted to the steel plates during the manufacturing process is demolished. A layer in which alloying elements are depleted around other precipitates of sulfides (CuS), carbides and nitrides is also formed. In the case of carbides and nitrides, however, the rates of C and N diffusion are extremely high even at low temperatures and hence, there is not much possibility that such depleted zones will be formed. By the quantitative evaluation of element-depleted zones which have been reported on the bainite formation as well, it will become possible to control the refinement of microstructures via the utilization of intragranular transformation and to manufacture high-function and high-strength steel materials having excellent HAZ toughness.

ジャーナルNippon Steel Technical Report
出版ステータス出版済み - 11月 2012

!!!All Science Journal Classification (ASJC) codes

  • 材料力学
  • 金属および合金
  • 材料化学


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