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TAS (Total Analysis System)를 이용한 SB-TRIP강에서의 2-D & 3-D 미세구조 분석 연구
설재복(J. B. Seol),임영록(Y. R. Lim),박찬경(C. G. Park) 한국소성가공학회 2009 한국소성가공학회 학술대회 논문집 Vol.2009 No.10
It has 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±0.39 at% C and the bainitic ferrite associated with 0.22±0.06 at% C in the SB-TRIP steel.
복합 밀링 공정에 따른 철계 산화물분산강화 합금의 미세조직 및 기계적 특성 변화 연구
설재복 ( Jae-bok Seol ),김경민 ( Kyong Min Kim ),김정한 ( Jeoung Han Kim ) 대한금속재료학회(구 대한금속학회) 2016 대한금속·재료학회지 Vol.54 No.3
A novel approach is established to produce oxide dispersion-strengthened steels with a fine distribution of oxide nanoparticles. This approach involves cryo-milling followed by ball-milling at room temperature. This complementary milling technique allows such steels to exhibit a remarkable combination of strength and ductility. Based on our experimental findings, the associated microstructural factor contributing to the strength is likely to be Y-Ti-O complex oxide particles. On the other hand, an additional milling process performed at room temperature is not effective with regard to deformationinduced sintering. Therefore, it is concluded that milling at room temperature after cryo-milling does not improve the tensile ductility of oxide dispersion-strengthened steels.