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TAS(Total Analysis System)을 이용한 SB-TRIP강에서의 2-D & 3-D 미세구조 분석 연구

2-D & 3-D Observations on the Microstructure of Super Bainite TRIP Steels using Total Analysis System

  • 설재복 (포항공과대학교, 신소재공학과) ;
  • 이봉호 (포항나노기술집적센터) ;
  • 박찬경 (포항공과대학교, 포항나노기술집적센터(NCNT))
  • 발행 : 2010.02.01

초록

It has been widely reported that carbide-free bainitic steels or super-bainite TRIP (SB-TRIP) steels for the automotive industry are a new family of steels offering a unique combination of high strength and ductility. Hence, it is important to exactly evaluate the volume fraction of RA and to identify the 3-D morphology of constituent phases, because it plays a crucial role in mechanical properties. Recently, as electron back-scattered diffraction (EBSD) equipped with focused ion beam (FIB) has been developed, 3-D EBSD technique for materials science are used to these steels. Moreover, newly developed atom probe tomography (APT) technique can provide the exact distribution and chemical concentration of alloying elements in a sub-nm scale. The APT analysis results indicate exactly the distribution and composition of alloying elements in the austenite and bainite phases of SB-TRIP steels with the atomic-scale resolution. And thus, no partitioning of aluminum and manganese atoms was showed between the austenite containing $7.73{\pm}0.39$ at% C and the bainitic ferrite associated with $0.22{\pm}0.06$ at% C in SB-TRIP steel.

키워드

참고문헌

  1. H. Bhadeshia, D. Edmonds, 1979, Metall. Mater. Trans. 10A, pp. 895-899.
  2. De Cooman BC, 2004, Curr. Opin. Solid State Mater. Sci., 8, pp. 285-290. https://doi.org/10.1016/j.cossms.2004.10.002
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피인용 문헌

  1. Three-dimensional characterization of bainitic microstructures in low-carbon high-strength low-alloy steel studied by electron backscatter diffraction vol.79, 2013, https://doi.org/10.1016/j.matchar.2013.02.009