연구성과 4 페이지 | 포항공과대학교 친환경소재대학원

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연구성과

Total 120건 4 페이지

72

ADL [ADL]Prof. Yoon-Uk Heo: Comparative study on the specimen thickness measurement using EELS and CBED methods Two thickness measurement methods using an electron energy loss spectroscopy (EELS) and 10a convergent beamelectron diffraction (CBED) were compared in an Fe-18Mn-0.7C alloy. The thin foil specimen was firstly tilted tosatisfy 10a two-beam ..

작성자 최고관리자 작성일 2021-12-01
71

MRL [MRL] Prof. Chong Soo Lee:Enhancing low-cycle fatigue life of commercially-pure Ti by deformation at cryogenic temperature In this study, the low-cycle fatigue behavior of a cryogenic-rolled commercially pure titanium alloy was investigated, and compared with those of undeformed and room-temperature rolled ones. The amounts of deformation twins increased to >..

작성자 최고관리자 작성일 2021-11-11
70

MRL [MRL] Prof. Chong Soo Lee: Microstructural evolution and mechanical properties of nanocrystalline Fe–Mn–Al–C steel processed by high-pressure torsion In this study, microstructural evolution and mechanical properties of Fe–Mn–Al–C steel were investigated with the variation of shear strain imposed by high-pressure torsion (HPT). Two different initial grain sized steels were used..

작성자 최고관리자 작성일 2021-11-02
69

MRL [MRL] Prof. Chong Soo Lee: Effect of bainite fraction on hydrogen embrittlement of bainite/ martensite steel The paper quantifies how the fraction of bainite in dual-phase (bainite/martensite) steel affects its resistance to hydrogen embrittlement (HE). For this purpose, three steels that had different amounts (0, 0.9, and 1.8&..

작성자 최고관리자 작성일 2021-10-27
68

MCL [MCL] Prof. Nack Joon Kim:Improvement of strength – ductility balance of B2-strengthened lightweight steel The microstructure evolution and tensile properties of a newly designed Fe-21Mn-10Al-1C-5Ni (wt.%) lightweight steel subjected to two annealing conditions (inducing partial recrystallization and full recrystallization) and subsequent aging ..

작성자 최고관리자 작성일 2021-10-08
67

MCL [MCL] Prof. Nack Joon Kim: κ-Carbide assisted nucleation of B2: A novel pathway to develop high specific strength steels Controlling morphology of B2 phase as nano-sized particles that are homogenously distributed within austenite matrix has been remained as a challenging task particularly for hot rolled lightweight steels, where the nucleation sites for B2 p..

작성자 최고관리자 작성일 2021-10-08
66

EML [EML] Prof. Sung-Mo Jung: Effect of MgO on Phase Development in Hematite-ilmenite Ore Sinter The effect of MgO on phase development in a hematite-ilmenite ore sinter was investigated employing a vertical tube furnace by raising the temperature at 30 K/min to 1553 K. The phases developed after sintering were identified in terms of X..

작성자 최고관리자 작성일 2021-09-29
65

기타 POSTECH 철강에너지소재대학원, AI 활용 출강자동화 시스템 개발 용광로 쇳물의 온도는 1600℃~1700℃에 이른다. 그래서 제철 과정은 절대적 주의가 필요한 작업이다. 더군다나 출강은 용광로에서 불순물 제거 작업을 거친 쇳물을 이송 용기에 담는 공정인데, 베테랑의 숙련도와 집중력에 따라 조업의 품질에 절대적인 영향을 미친다. 이 위험천만한 고난도의 작업을 인공지능이 대신하면 어떨까? POSTECH(포항공과대학교, 총장 김무환) 철강∙에너지소재대학원 홍대근 교수와 임창희..

작성자 최고관리자 작성일 2021-09-02
64

CTL [CTL] Prof. Chang Hee Yim: The effect of Ni depletion on athermal martensitic transformation in 304 austenitic stainless steel Chemical and microstructural analyses were performed on Ni depletion zones in 304 austenitic stainless steelsheets after annealing and cooling with three different rates (0.2, 18.6, 160.0 ◦C/s). The analysis was focused onthe characteristic..

작성자 최고관리자 작성일 2021-08-26
63

CSL [CSL] Prof.Youn-Bae Kang: Thermodynamic Modeling of Liquid Steel Thermodynamic property of liquid steel is often described by activity coefficient of solute in the steel (the other form of partial excess Gibbs energy of the solute). Reliable description of the activity coefficient is required in order to..

작성자 최고관리자 작성일 2021-08-25
62

MML [MML] Prof. F. Barlat: Calibration of Distortional Plasticity Framework and Application to U-draw Bending Simulations A new version of a distortional plasticity framework, the so-called homogeneous anisotropic hardening (HAH), was investigated regarding its calibration and its application to the numerical analysis of the U-draw bend test. First, the mech..

작성자 최고관리자 작성일 2021-08-25
61

MML [MML] Prof. F. Barlat: Performance review of various uncoupled fracture criteria for TRIP steel sheet The exact numerical description of ductile fracture for advanced high strength steel (AHSS) sheets, particularly for different deformation modes, is an ongoing issue for the sheet metal research community at large. Although, in the last few..

작성자 최고관리자 작성일 2021-08-25
60

SNMPL [SNMPL] Prof. Hyoung Seop Kim: Exploration of optimal microstructure and mechanical properties in continuous microstructure space using a variational autoencoder Data-driven approaches enable a deep understanding of microstructure and mechanical properties of materials and greatly promote one's capability in designing new advanced materials. Deep learning-based image processing outperforms conventio..

작성자 최고관리자 작성일 2021-07-21
59

SSL [SSL] Prof. Sung-Joon Kim: Nitrogen effect on hydrogen diffusivity and hydrogen embrittlement behavior in austenitic stainless steels Hydrogen embrittlement behavior of three austenitic stainless steels with 0.1–0.3 wt% N was investigated by electro-chemical charging of hydrogen. The degradation of tensile properties was alleviated by nitro- gen. Hydrogen permeation testi..

작성자 최고관리자 작성일 2020-09-07
58

CML [CML] Prof. Dong Woo Suh:Quenching and partitioning (Q&P) processed medium Mn steel starting from heterogeneous microstructure We examine the microstructure and tensile properties of the quenching and partitioning (Q&P) processed medium Mn steels having different starting microstructure. Heterogeneous Mn distribution led by intercritical annealing prior to the ..

작성자 최고관리자 작성일 2020-09-01
57

CML [CML] Prof. Dong Woo Suh:Analysis of transformation stasis by the Gibbs energy balance (GEB) approach modified to consider carbon redistribution int .… The Gibbs energy balance (GEB) concept for modeling the transformation stasis during isothermal ferrite formationis revisited. Modification has been made to take into account the carbon redistribution into remainingaustenite and the increas..

작성자 최고관리자 작성일 2020-09-01

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