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In Situ Observation of Phase Transformation in Low-Carbon, Boron-Treated Steels

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Abstract

It is known that adding the appropriate amount of boron to steels dramatically increases their hardness and toughness as a result of the transition of the microstructure from grain boundary nucleation to intragranular nucleation. In this study, precipitation and phase transformation kinetics in heat-affected zones of low-carbon, boron-treated steels are observed directly by high-temperature laser scanning confocal microscopy. The effects of boron content and austenite grain size on the phase transformation process are investigated systematically by quantifying the transformation product, the transformation start temperature, the average length of the ferrite plates, and the average number of potent nucleation sites. Finally, detailed methods for controlling and optimizing the microstructure in the heat-affected zones of low-carbon, boron-treated steels are discussed.

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Authors and Affiliations

  1. Joining and Welding Research Institute, Osaka University, Ibaraki, Osaka, 567-0047, Japan

    Di Zhang (Research Fellow) & Yu-Ichi Komizo (Professor)

  2. Plate & Bar/Wire Rod Research & Development Department, Sumitomo Metal Industries Ltd., Amagasaki, Hyogo, 660-0891, Japan

    Yoshiaki Shintaku (Research Engineer)

  3. Steel Sheet, Plate Titanium & Structural Steel Company, Sumitomo Metal Industries Ltd., Chuo-ku, Tokyo, 104-6111, Japan

    Shuichi Suzuki (General Manager)

Authors
  1. Di Zhang
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  2. Yoshiaki Shintaku
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  3. Shuichi Suzuki
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  4. Yu-Ichi Komizo
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Corresponding author

Correspondence to Di Zhang.

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Manuscript submitted April 18, 2011.

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Zhang, D., Shintaku, Y., Suzuki, S. et al. In Situ Observation of Phase Transformation in Low-Carbon, Boron-Treated Steels. Metall Mater Trans A 43, 447–458 (2012). https://doi.org/10.1007/s11661-011-0892-8

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