Effect of Ti De-oxidation on Solidification and Post-solidification Microstructure in Low Carbon High Manganese Steel

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概要

• 論文の詳細を見る

• This paper investigates the effect of de-oxidation inclusions on micro-structure in low-carbon steels. Low carbon (0.07 wt%), high Mn (0.9 wt%) steel in a Al2O3 or MgO crucible was deoxidized by adding either aluminum (0.05 wt%) or titanium (0.05, 0.03 or 0.015 wt%) in a 400 g-scale vacuum furnace, and cast in a Cu mold at cooling rates between 2.0–6.0 K/s.The oxide inclusions were identified as Al2O3 (1–3 μm) in the Al-killed steel and Ti–Al–(Mg)–O (0.3–0.5 μm) in the Ti-killed steel. Oxide inclusion sizes in all the Ti-killed steels were smaller and inclusion densities higher than those in the Al-killed steel.Solidification structure, defined as the density of primary dendrite arms within a defined region was finer with increasing inclusion density and as a result, the solidification structure of the Ti-killed steel was finer than that of the Al-killed steel.A Confocal Scanning Laser Microscope (CSLM) and a Differential Scanning Calorimeter (DSC) were used to study the differences in solid state micro-structural evolution between the Ti-killed, Al-killed and the non de-oxidized samples. The growth of austenite grains were studied under isothermal conditions and it was found that both grain-boundary mobility and final grain size were lower in the Ti-killed sample than for the others. With regards to austenite decomposition, during continuous cooling from a comparable austenite grain structure, the resulting austenite decomposition structure was finer for the Ti-killed sample due to a higher Widmanstätten lath density due to precipitation at particles in addition to grain boundaries.

• 社団法人 日本鉄鋼協会の論文
• 2007-09-15

著者

• Sridhar Seetharaman

  Dep. Of Material Sci. & Engineering Carnegie Mellon Univ.

• Sridhar Seetharaman

  Department Of Materials Science And Engineering Carnegie Mellon University

• MATSUSHITA Taishi

  Department of Materials Science and Engineering, Royal Institute of Technology

• NABESHIMA Seiji

  Steelmaking Research Dept., Steel Research Laboratory, JFE Steel Corp.

• 松下 泰志

  九州工業大学工学部

• Kikuchi Naoki

  Steelmaking Research Department Steel Research Labs Jfe Steel Corp.

• Kikuchi Naoki

  Department Of Food Science And Technology Tokyo University Of Fisheries

• KISHIMOTO Yasuo

  Steelmaking Research Department, Steel Research Labs, JFE Steel Corp.

• Nabeshima Seiji

  Steelmaking Research Department Steel Research Labs Jfe Steel Corp.

• Matsushita Taishi

  Royal Inst. Of Technol. Stockholm Swe

• Matsushita Taishi

  Faculty Of Engineering Kyushu Institute Of Technology

• Matsushita Taishi

  Department Of Materials Science And Engineering Royal Institute Of Technology

• 松下 泰志

  九州工業大学大学院工学研究科物質工学専攻

• Kishimoto Yasuo

  Steelmaking Research Department Steel Research Laboratory Jfe Steel Corp.

• Nabeshima Seiji

  Steelmaking Research Department Steel Research Lab Jfe Steel Corporation

• Matsushita Taishi

  Department of Materials and Manufacturing-Casting, School of Engineering, Jönköping University

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