Characterization of Transformation Stasis in Low-Carbon Steels Microalloyed with B and Mo

Tadashi Furuhara, Kenji Tsuzumi, Goro Miyamoto, Takafumi Amino, Genichi Shigesato

研究成果: Article査読

18 被引用数 (Scopus)

抄録

In the present study, bainite transformation kinetics was examined in low C-Mn steels with the addition of small amounts of B and Mo. This addition delays the onset of the bainite transformation. Mo addition causes transformation stasis at temperatures between 873 K and 823 K (600 °C and 550 °C) just below the bainite-start (Bs) temperature, resulting from an incomplete bainite transformation. Post-stasis transformation after a prolonged hold proceeds by the formation of ferrite with a low dislocation density, and in Mo-containing alloys, often the formation of carbides. The volume fraction at which the transformation stops is higher for lower carbon contents and lower transformation temperatures. By contrast, at 773 K (500 °C), the bainite transformation accompanying cementite precipitation occurs regardless of microalloying and is completed after shorter hold times. EDX measurement performed on the Mo-added 0.15 pct C alloy with aberration-corrected STEM revealed that segregation at the bainite/austenite interphase boundary is small for Mn and negligible for Mo in the early stages of stasis, which does not support the incomplete transformation mechanism based on the solute drag theory for the alloys used.

本文言語English
ページ(範囲)5990-5996
ページ数7
ジャーナルMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
45
13
DOI
出版ステータスPublished - 2014 10 24

ASJC Scopus subject areas

  • 凝縮系物理学
  • 材料力学
  • 金属および合金

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