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Effect of Highly Pressurized Hydrogen Gas Charging on the Hydrogen Embrittlement of API X70 Steel
Dong-Su Bae,Chi-Eun Sung1,Hyun-Ju Bang,Sang-Pill Lee,Jin-Kyung Lee,In-Soo Son,조영래,Un-Bong Baek,Seung-HoonNahm 대한금속·재료학회 2014 METALS AND MATERIALS International Vol.20 No.4
During the use of API X70 steel as a pipeline structural material for the transportation of natural gas,hydrogen embrittlement can occur due to the hydrogen contained in natural gas. The aim of this study is toinvestigate the effects of the hydrogen content under high-pressure hydrogen gas conditions on the hydrogenembrittlement of air-cooled API X70 steel. The air-cooled API X70 steel was manufactured by hot rollingand was then air-cooled to room temperature. Tensile test specimens were held for 0 h, 1000 h, and 2000 hwithin a pressure vessel filled with 100% hydrogen gas at a gas pressure of 10 MPa, with the tensile teststhen performed at room temperature. The microstructure of the API X70 steel consists of coarse polygonalferrite, coarse pearlite, and fine acicular ferrite. The yield and tensile strength increased and elongationdecreased considerably after a holding time of 2000 h compared to those of 0 h and 1000 h within the pressurevessel. The morphology of the fracture surface changed from ductile to brittle upon hydrogen gas charging. Secondary cracks were observed in both of the hydrogen-gas-charged specimens. No external cracks wereformed on the surface of the tensile-tested specimen with a 0 h holding time; however, many external crackswere observed on the specimen surface subjected to hydrogen gas charging.
Cure Characteristics of Foaming EVA Compounds: Influence of EVA Types and Cure Systems
( Sung-seen Choi ),( Jong Woo Bae ),( Jung-soo Kim ),( Dong-hun Han ) 한국고무학회 2016 엘라스토머 및 콤포지트 Vol.51 No.3
Influence of poly(ethylene-co-vinyl acetate) (EVA) types and cure systems on cure characteristics of foaming EVA compounds were investigated. Three kind EVAs with different VA contents were employed. Influence of triallyl cyanurate (TAC) and dicumylperoxide (DCP) content on the cure characteristics were examined. The minimum torque (T< sub >min< /sub>) and delta torque (ΔT) decreased as the VA content increased. The ΔT was increased by adding TAC and by increasing the DCP content. For the foaming EVA compounds without TAC, the cure times such as the minimum cure time (t< sub >min< /sub >), scorch time (t₂), and optimal cure time (t< sub 90< /sub >) did not show a specific trend according to the DCP contents. For the foaming EVA compounds containing TAC, the cure times decreased as the DCP content increased. From the experimental results, it was found that efficienct DCP/TAC ratio for improvement of the crosslink density was 1.1~2.0.
A Study on Resin Flow to Make a Replica Using a Silicone Mold
Bae, Kum-Soo,Rhee, Sang-Yong,Kim, Young-Baek Korean Institute of Intelligent Systems 2008 INTERNATIONAL JOURNAL of FUZZY LOGIC and INTELLIGE Vol.8 No.2
The replica of silicone mold which can produce the test samples and the market-displayable products without making expensive metallic patterns is advantageous because it incurs less cost than the ordinary method that manufactures the products from the metallic patterns. However, the production of the products using silicone mold should require a technician with professional knowledge about the metallic patterns every time. Thus we tried to judge whether a forming analysis software for iron molding can be applied to silicon molding in this paper. In other words, this paper suggests a method to use a computer simulator from the designing step of the silicone mold, which is the most important part in making replica using simple silicone molds to the step of pouring the cast. The paper shows that if the know-how of a professional worker is provided in advance, an amateur worker can easily produce silicone molds of the best quality, the defective rate of the products will be decreased, and the replica will have a more complete status. By doing so, we suggested a possibility for reducing the delivery time at the production sites and for improving the product quality.
Chemisorption of Ethanol on Ge(100) Surface
Bae, Sung-Soo,Lee, A-Reum,Kim, Sehun,Kim, Do Hwan American Chemical Society 2018 The Journal of Physical Chemistry Part C Vol.122 No.27
<P>Chemical reaction of ethanol (CH<SUB>3</SUB>CH<SUB>2</SUB>OH) with Ge(100) surface has been investigated using scanning tunneling microscopy (STM) observation and density functional theory (DFT) calculations. At low coverage, high-resolution STM images showed that ethanol dissociatively adsorbed on a single Ge dimer. The adsorption features included bright protrusions assigned to Ge-OCH<SUB>2</SUB>CH<SUB>3</SUB> structure formed via O-H dissociation of ethanol. Real-time STM observations revealed that the molecular chain of ethanol increased gradually via successive adsorption along the dimer row direction following increased exposure to ethanol. DFT calculation results showed that the adsorption of ethanol on Ge(100) was dominated by kinetic control at room temperature. Thus, an integrated study of experimental and theoretical approaches coherently confirmed that ethanol reacts with Ge(100) via O-H dissociative adsorption and the final structure has the H-Ge-Ge-OCH<SUB>2</SUB>CH<SUB>3</SUB> geometry on a single dimer of Ge(100).</P> [FIG OMISSION]</BR>
Enhanced Stability of Coated Carbon Electrode for Li-O<sub>2</sub> Batteries and Its Limitations
Bae, Youngjoon,Ko, Dong-Hyun,Lee, Sunyoung,Lim, Hee-Dae,Kim, Yun-Jung,Shim, Hyun-Soo,Park, Hyeokjun,Ko, Youngmin,Park, Sung Kwan,Kwon, Hyuk Jae,Kim, Hyunjin,Kim, Hee-Tak,Min, Yo-Sep,Im, Dongmin,Kang, Wiley (John WileySons) 2018 ADVANCED ENERGY MATERIALS Vol.8 No.16