Research Achievements 8 페이지 | 포항공과대학교 친환경소재대학원

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Research Achievements

Total 148건 8 페이지

36

MRL [MRL] Prof. Chong Soo Lee: Effect of grain boundary engineering on hydrogen embrittlement in Fe-Mn-C TWIP steel at various strain rates The influence of strain rate (10−3≤ε˙ ≤10−5 s−1) on hydrogen embrittlement behavior of Fe−17Mn−0.8C (wt.%) TWIP steel was investigated. Two types of specimens were tested; one (AR) was hot-rolled, and the other (GBE) was further processed b..

작성자 최고관리자 작성일 2019-03-31
35

MML [MML] Prof. F. Barlat: Influence of Yield Stress Determination in Anisotropic Hardening Model on Springback Prediction in Dual-Phase Steel In this study, a numerical sensitivity analysis of the springback prediction was performed using advanced strain hardening models. In particular, the springback in U-draw bending for dual-phase 780 steel sheets was investigated while focusi..

작성자 최고관리자 작성일 2019-02-28
34

MML [MML] Porf. F. Barlat: Identification of Dynamic Flow Stress Curves Using the Virtual Fields Methods: Theoretical Feasibility Analysis An inverse approach based on the virtual fields method (VFM) is presented to identify the material hardening parameters under dynamic deformation. This dynamic-VFM (D-VFM) method does not require load information for the parameter identific..

작성자 최고관리자 작성일 -0001-11-30
33

MML [MML] Prof. F. Barlat: Influence of Yield Stress Determination in Anisotropic Hardening Model on Springback Prediction in Dual-Phase Steel In this study, a numerical sensitivity analysis of the springback prediction was performed using advanced strain hardening models. In particular, the springback in U-draw bending for dual-phase 780 steel sheets was investigated while focusi..

작성자 최고관리자 작성일 2019-02-28
32

MML [MML] Prof. F. Barlat: A crystal plasticity model for describing the anisotropic hardening behavior of steel sheets during strain-path changes In the present study, a viscoplastic self-consistent crystal plasticity model (VPSC-RGBV), which accounts for various microstructural features, including the accumulation and annihilation of dislocations due to slip activity and latent..

작성자 최고관리자 작성일 2019-02-28
31

MML [MML] Prof. F. Barlat: Advanced constitutive modeling of advanced high strength steel sheets for springback prediction after double stage U-draw bending In this study, a U-shaped channel formed using a double drawing process (double stage U-draw bending) was proposed to reduce the amount of springback in the AHSS sheets. The performance of the double stage U-draw bending process in red..

작성자 최고관리자 작성일 2019-02-28
30

MML [MML] Prof. F. Barlat: Anisotropic Plasticity and Application to Plane Stress (Encyclopedia) Definitions Plasticity is the ability of a material to deform in an irreversible manner. Unlike elasticity for which deformations are reversible, plasticity leads to permanent shape changes after a sufficient load is applied to a mater..

작성자 최고관리자 작성일 2019-02-28
29

CML [CML] Prof. Dong-Woo Suh: Influence of initial microstructures on intercritical The present work reports the effect of different initial microstructures on reverse transformation kinetics and morphologies of austenite formed during intercritical annealing in Fe-0.14C-7Mn-1Si (wt-%)mediumMnsteel. Three different initial..

작성자 최고관리자 작성일 2019-01-28
28

CML [CML] Prof. Dong-Woo Suh: Effect of Prior Austenite Grain Size on Hole Expansion Ratio The effect of the prior austenite grain size (PAGS) on the tensile properties and hole expansion ratio (HER) has been investigated. Starting from different PAGS values (4.7 lm and 15.2 lm) obtained by controlling the austenitizing temperatu..

작성자 최고관리자 작성일 2019-01-28
27

CTL [CTL] Fazlollah Sadeghi: Optimizing Grain Selection Design in the Single-Crystal An attempt is made to model the design of grain selection during single-crystal solidification of an Ni-based superalloy by the Bridgman method. Various geometrical designs of the starter block and spiral grain selector are chosen and their..

작성자 최고관리자 작성일 2018-12-31
26

SSL [SSL] Prof. Sung-Joon Kim: Effects of carbon and nitrogen on austenite stability and tensile deformation The austenite stability and deformation behavior of 15Cr-15Mn-4Ni based austenitic stainless steels alloyed with C or N are studied. Stability of austenite against martensitic transformation was enhanced with increasing C or N content, whil..

작성자 최고관리자 작성일 2018-12-31
25

SSL [SSL] Prof. Sung-Joon Kim: Fe-Zn reaction and its influence on microcracks during hot tensile Fe-Zn reaction was investigated by annealing a galvanized 22MnB5 steel sheet at 500–900 ° C for 5 min. The observed Fe-Zn intermetallic compounds within the coating depended on the annealing temperature. As the temperature increased, the c..

작성자 최고관리자 작성일 2018-12-31
24

ADL [ADL] Prof. Yoon-Uk Heo: Determination of Yield Stress in a Duplex Steel with a + c Lamellar Structure Yield stress ry is evaluated in a duplex steel with a + c lamellar structure by calculating the stress for the propagation of pile-up dislocations in one phase into another phase. Effective grain size of a lamella is determined to calculate..

작성자 최고관리자 작성일 2018-11-30
23

ATL [ATL] Prof. Yang Mo Koo: Effect of Al content on Magnetic Domains of {100} Grains in Electrical Steels Magnetic domains of {100} grains in electrical steels with 1.85 ≤ Al ≤ 6.54 wt. % were observed by magneto-optic Kerr microscopy. The characteristics and motion of magnetic domains were correlated with hysteresis loss, anomalous loss and..

작성자 최고관리자 작성일 2018-10-31
22

기타 권세균 교수: ‘합금 이상의 합금’ 고엔트로피 합금에 주목해야 하는 이유 (포스코뉴스룸) 이 기사는 포스코뉴스룸에서 가져왔습니다. https://newsroom.posco.com/kr/%ED%95%A9%EA%B8%88-%EC%9D%B4%EC%83%81%EC%9D%98-%ED%95%A9%EA%B8%88-%EA%B3%A0%EC%97%94%ED%8A%B8%EB%A1%9C%ED%94%BC-%ED%95%A9%EA%B8%88%EC%97%90-%EC%A3%BC%EB%AA%A9%ED%95%B4%EC%95%B..

작성자 최고관리자 작성일 2018-10-29
21

CTL [CTL] Prof. Jung-Wook Cho: Thermal history driven molecular structure transitions in alumino-borosilicate glass The glass network structure governs various thermos-physical properties such as viscosity, thermal, and electrical conductivities, and crystallization kinetics. We investigated the effect of temperature on structural changes in a Na2O-CaOAl..

작성자 최고관리자 작성일 2018-09-30

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