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design and Simulation of Hinge-type ro-ro (roll-on/roll-off) Ship Car deck Structure 33rd

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Design and Simulation of Hinge-type Ro-Ro (Roll-on/Roll-off)...

33rd International Ocean and Polar Engineering Conference, ISOPE 2023

作者： Kim, Hyun Soo Cho, Min Goo Kang, Sung Wook Kim, Jae Woong Pyo, Chang Min Ji, Chang Wook Park, Jang Ik Precision Mechanical Process and Control R&D Group Korea Institute of Industrial Technology Gyeongsangnam-do Jinju Korea Republic of Automotive Materials & Components R&D Group Korea Institute of Industrial Technology Gwangju Korea Republic of Advanced Forming Process R&D Group Korea Institute of Industrial Technology Ulsan Korea Republic of Research center Dae Lyun Engineering Co. Ltd. Busan Korea Republic of

ISBN: (纸本)9781880653807

ro-ro ships can roll-on or roll-off cargo with self-driving power such as passenger cars and trucks, and container cargo on transport devices such as trucks or trailers on a ramp. The representative types of ro-ro ships are PCC (Pure Car Carrier) and PTCT (Pure Car & Truck Carrier). ro-ro ship is configured to load as many cargoes as possible by dividing the cargo hold into multiple card decks up and down. It is necessary to adjust the height of the car deck according to the type of vehicle being loaded. For this purpose, a number of fillers are installed on the inner deck of the ro-ro ship. In other words, to load high cargo such as heavy equipment on the car deck, the height between the decks must be high. At this time, the liftable car deck is adjusted using the deck lifter installed on the pillar. Existing liftable car deck structures are made of a single large plate, so it takes a lot of time and money to install and dismantle them. In this study, a hinge-type liftable car deck was designed. In addition, the overall structural integrity including the hinge was evaluated through structural analysis in accordance with the classification regulations. © 2023 by the International Society of Offshore and Polar Engineers (ISOPE).

关键词： Arctic engineering

domain Adaptation based Fin Height Measurement for drAM 5

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Domain Adaptation based Fin Height Measurement for DRAM

5th IEEE International Women in Technology Conference, WINTECHCON 2024

作者： Singh, ramya Bagavath Sultania, Gaurav Pedapudi, Lakshmi Narayana Ahn, Joonyoung Song, Je Ung Ahn, Hyomin Smart Equipment Solutions Group Samsung Semiconductor India Research Bangalore India Advanced Process Development Team 4 Semiconductor R&D Center Hwaseong Korea Republic of

ISBN: (纸本)9798350374070

Fin Height is critical quality parameter of drAM device and its measurement is destructive process. This measurement process has some disadvantages – destroying wafer/chips, limitation on number of chips for measurement leads to less data samples, and its availability towards end of production cycle. Ability of system to predict fin height early/mid production cycle serves vital role to reduce redundancy and save losses in the production pipeline. With the advent of Spectroscopic methods like Ellipsometry (SE), reflectometry, Interferometry, it is possible to capture spectral characteristics of devices in non-destructive framework. ML/dL modelling of spectrum data learns fin height characteristics and aids prediction. Simulation of drAM for spectrum data enables more learning data, helps to enhance fin height prediction by not just data augmentation technique of simulated data to real data. We adopt and employ domain Adaptation (dA) methods for regression problem where dA mostly dealt with classification problem. We demonstrate significant improvement in fin height prediction accuracy by using simulated data in addition to real data via various domain Adaptation methods. © 2024 IEEE.

关键词： dynamic random access storage

domain Adaptation Based fin Height Measurement for drAM

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Domain Adaptation Based fin Height Measurement for DRAM

Women in Technology Conference (WINTECHCON), 2022 IEEE

作者： ramya Bagavath Singh Gaurav Sultania Lakshmi Narayana Pedapudi Joonyoung Ahn Je Ung Song Hyomin Ahn Smart Equipment Solutions Group Samsung Semiconductor India Research Bangalore India Advanced Process Development Team 4 Semiconductor R&D Center Hwaseong South Korea

ISBN: (数字)9798350374070

ISBN: (纸本)9798350374087

Fin Height is critical quality parameter of drAM device and its measurement is destructive process. This measurement process has some disadvantages - destroying wafer/chips, limitation on number of chips for measurement leads to less data samples, and its availability towards end of production cycle. Ability of system to predict fin height early/mid production cycle serves vital role to reduce redundancy and save losses in the production pipeline. With the advent of Spectroscopic methods like Ellipsometry (SE), reflectometry, Interferometry, it is possible to capture spectral characteristics of devices in non-destructive framework. ML/dL modelling of spectrum data learns fin height characteristics and aids prediction. Simulation of drAM for spectrum data enables more learning data, helps to enhance fin height prediction by not just data augmentation technique of simulated data to real data. We adopt and employ domain Adaptation (dA) methods for regression problem where dA mostly dealt with classification problem. We demonstrate significant improvement in fin height prediction accuracy by using simulated data in addition to real data via various domain Adaptation methods.

关键词： Semiconductor device measurement Pipelines random access memory Termination of employment Production reflectometry Predictive models Height measurement Transistors Interferometry

Material Extrusion for Ceramic Additive Manufacturing with Polymer-Free Ceramic Precursor Binder

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SSrN 2022年

作者： Hur, Hyuk Park, Yu Jin Kim, dong-Hyun Ko, Jong Wan 3D Printing Manufacturing Process Center Advanced Forming Process R&D Group Korea Institute of Industrial Technology Techno saneop-ro 29beon-gil Ulsan44776 Korea Republic of

Additive manufacturing of dense ceramic products has been challenging because of the high polymeric content of the feedstock materials. Several studies have been conducted to increase the ceramic content in the feedstock, but the binder and additives in it have remained in the polymeric content. A novel strategy for highly dense additive manufacturing using a sol-gel-based ceramic slurry without polymeric additives is presented. Alumina, which is the most widely used fine ceramic, was chosen as a representative ceramic material. The proposed sol-gel solution enabled a high solid loading of approximately 50 vol. % without any polymeric dispersant while satisfying the requirements of material extrusion, such as extrudable viscosity ( © 2022, The Authors. All rights reserved.

关键词： Aluminum oxide

Microstructure and Mechanical Properties of Adjustable-ring-Mode Laser Welded And Hot-Stamped Al-Si Coated Boron Steel Joints

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SSrN 2023年

作者： Jun, Hyun-Uk Kim, Jae-deuk Cheon, Jooyong Kim, Jaehun Park, Yeong-do Kim, Yang-do Ji, Changwook Department of Materials Science and Engineering Pusan National University Busan46241 Korea Republic of Advanced Forming Process R&D Group Korea Institute of Industrial Technology Ulsan44413 Korea Republic of Department of Advanced Materials Engineering Dong-Eui University Busan47227 Korea Republic of

The microstructure and mechanical properties of adjustable-ring-mode (ArM) laser-welded, hot-stamped 22MnB5 steel joints were analyzed and compared with those of Al–Si coated 22MnB5. Al segregation into the fusion zone (FZ) was suppressed by a ring beam introduced via ring-beam-mode (rBM) and dual-beam-mode (dBM) laser welding. dilution of the Al–Si coating in the FZ induced α-ferrite formation during hot stamping. After hot stamping, the α-ferrite fraction in the FZ decreased (from 23 vol% to 4.27 vol%) more than that in the center-beam-mode (CBM) welded joints owing to the ring beam. Electron backscattered diffraction analysis indicated the distribution of high-density and uniform geometrically necessary dislocations, which caused coordinated deformation in the martensite grains, in the rBM and dBM FZs. The average microhardness in the FZ in the tailor-welded blank (TWB) joints was ~ 30–40 HV lower than that in the rBM and dBM welded base metal (480 HV) and that in the FZ of the CBM reduced to 295 HV because of the formation of a large amount of ductile α-ferrite. The tensile strength and elongation of the TWB joint in the CBM were ~989 MPa and 1.1 %, respectively, which were significantly lower than those of the rBM (1245 MPa and 1.96 %, respectively) and dBM (1321 MPa and 2.12 %, respectively). Finally, the 22MnB5 steel sheets were subjected to ArM laser welding without removing the coating layer to evaluate the eﬀect of the ring beam on Al segregation suppression in the FZ and mechanical properties of the TWB joints. © 2023, The Authors. All rights reserved.

关键词： Microstructure

Microstructures and mechanical behavior of the bimetallic additively-manufactured structure(BAMS)of austenitic stainless steel and Inconel 625

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Journal of Materials Science & Technology 2021年第15期74卷 176-188页

作者： Md.r.U.Ahsan Xuesong Fan Gi-Jeong Seo Changwook Ji Mark Noakes Andrzej Nycz Peter KLiaw duck Bong Kim Department of Mechanical Engineering Tennessee Technological UniversityCookevilleTN38505United States Department of Materials Science and Engineering The University of TennesseeKnoxvilleTN37996United States Department of Manufacturing and Engineering Technology Tennessee Technological UniversityCookevilleTN38505United States Advanced Forming Process R&D Group Korea Institute of Industrial TechnologyUlsan 44413South Korea Oak Ridge National Laboratory Oak RidgeTN37830United States

Bimetallic additively manufactured structures(BAMSs)can replace traditionally-fabricated functionallygraded-components through fusion welding processes and can eliminate locally-deteriorated mechanical properties arising from *** present work fabricates a BAMS by sequentially depositing the austenitic stainless-steel and Inconel625 using a gas-metal-arc-welding(GMAW)-based wire+arc additive manufacturing(WAAM)*** mapping shows a smooth compositional transition at the interface without any *** materials being the face-center-cubic(FCC)austenite,the electron backscattered diffraction(EBSd)analysis of the interface shows the smooth and cross-interfacecrystallographic growth of long-elongated grains in the<001>*** hardness values were within the range of 220-240 HV for both materials without a large deviation at the *** to the controlled thermal history,mechanical testing yielded a consistent result with the ultimate tensile strength and elongation of 600 MPa and 40%,respectively,with the failure location on the stainless-steel *** study demonstrates that WAAM has the potential to fabricate BAMS with controlled properties.

关键词： WAAM Additive manufacturing BAMS Functionally-graded structures Microstructures Mechanical properties

Effect of Additional Side Shielding on the Wire Arc Additive Manufacturing of Az31 Magnesium Alloy

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SSrN 2023年

作者： Kim, Jae-deuk Jun, Hyun-Uk Cheon, Jooyong Kim, Jaewon Kim, Jae-Hun Ji, Changwook Kim, Yang-do Department of Materials Science and Engineering Pusan National University Busan46241 Korea Republic of Advanced Forming Process R&D Group Korea Institute of Industrial Technology Ulsan44413 Korea Republic of Production Technology Research Center Samsung Heavy Industries Co. Ltd Gyeongsangnam-do Geoje-Si53261 Korea Republic of

Magnesium (Mg) alloys have a low density among the structural metals, but it is hard to be plastically deformed due to their crystallographic nature. Wire arc additive manufacturing (WAAM) could be one of the alternative processes to fabricate the Mg products for various industrial applications. Nonetheless, it has not been yet barely used in industrial fields due to challenging issues such as low commercial availability of wire, high oxygen affinity, explosive and flammable hazard, and typical defects of WAAM like distortion and side collapse, grain coarsening, etc. In this research, it was tried to find out the better way to fabricate the WAAM of AZ31 alloy. An additional side shielding was given for global shielding during the WAAM process, and compared with the conventional shielding method. It was observed that the global shielding affects the microstructural evolution of the WAAM product, and influences the mechanical property in a positive way. © 2023, The Authors. All rights reserved.

关键词： 3d printing

Phase stability and mechanical properties of wire+arc additively manufactured H13 tool steel at elevated temperatures

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Journal of Materials Science & Technology 2021年第8期67卷 80-94页

作者： A.N.M.Tanvir Md.r.U.A hsan Gijeong Seo Brian Bates Chanho Lee Peter K.Liaw Mark Noakese Andrzej Nycz Changwook Ji duck Bong Kim Department of Mechanical Engineering Tennessee Technological UniversityCookevilleTN 38505USA Department of Manufacturing and Engineering Technology Tennessee Technological UniversityCookevilleTN 38505USA Center for Manufacturing Research Tennessee Technological UniversityCookevilleTN 38505USA Department of Materials Science and Engineering University of TennesseeKnoxvilleTN 37996USA Manufacturing Demonstration Facility Oak Ridge National LaboratoryOak RidgeTN 37830USA Advanced Forming Process R&D Group Korea Institute of Industrial TechnologyUlsan 44413Republic of Korea

Wire+arc additive manufacturing(WAAM)is considered an innovative technology that can change the manufacturing landscape in the near *** offers the benefits of inexpensive initial system setup and a high deposition rate for fabricating medium-and large-sized parts such as die-casting *** this study,AISI H13 tool steel,a popular die-casting tool metal,is manufactured by cold metal transfer(CMT)-based WAAM and is then comprehensively analyzed for its microstructural and mechanical ***-dependent phase combinations are observed,which could be explained by nonequilibrium thermal cycles that resulted from the layer-by-layer stacking mechanism used in *** addition,remelting and reheating of the layers reduces welding anomalies(e.g.,pores and voids).The metallurgical characteristics of the H13 strongly correlate with the mechanical *** combinations of phases at different locations of the additively manufactured part exhibit a periodic microhardness ***,retained Austenite,Ferrite,and Carbide phases are found in combination at different locations of the part based on the part’s temperature distribution during additive ***,the tensile properties at elevated temperatures(23℃,300℃,and 600℃)are comparable to those from other WAAM and additive manufacturing(AM)*** X-ray diffraction results verify that the microstructural stability of the fabricated parts at high temperatures would allow them to be used in high temperatures.

关键词： Tool steel Martensitic steel Wire+arc additive manufacturing(WAAM) High temperature tensile test High temperature Xrd

development of an Fe-Based Alloy with reinforced Austenite and Packet Lath Martensite as Filler Metals for 9% Ni Steel

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SSrN 2022年

作者： Choi, Kwangsu Hwang, Jiyong Jung, Hyo Yun Advanced Forming Process R&D Center Korea Institute of Industrial Technology Ulsan44413 Korea Republic of Department of Materials Science and Metallurgical Engineering Kyungpook National University Daegu41566 Korea Republic of

Typically, 9% Ni steel is welded with Ni-based filler metal composed of expensive elements, such as Ni and Mo . In this study, a novel Fe-based alloy composed of inexpensive elements was designed for the welding of 9% Ni steel. The gas tungsten arc welding process with superior electric current stability was selected to evaluate the weldability and welding properties. The weld metal produced during single- and multi-passed welding formed the microstructure, which comprised equiaxed packet lath martensite and prior austenite. The suitability of the mechanical properties of the proposed Fe-based filler metal for 9% Ni steel welding was verified via tensile tests of the weld joint and base metal, namely the 9% Ni steel, at 25 ℃ and −163 ℃. In comparison with the 9% Ni steel, the Fe-based filler metal improved the yield and tensile strengths of weld joints by more than 5.5% at room and cryogenic temperatures. Additionally, the tensile fracture of the specimen occurred in the base metal and not in the weld metal or the heat-affected zone, confirming the high stiffness of the weld metal. Therefore, the proposed Fe-based filler metal can serve as an economical material for welding the 9% Ni steel. © 2022, The Authors. All rights reserved.

关键词： Filler metals