Do-Sik Shim
Korea Maritime and Ocean University
Ultimate tensile strengthSurface modificationEngineeringForming processesDeposition (phase transition)Composite materialMartensiteMetallurgyMaterials scienceCurvatureTool steelLayer (electronics)Sheet metalHullSubstrate (electronics)Bending (metalworking)Structural engineeringDeposition (chemistry)Mechanical engineeringMicrostructureProcess (computing)
70Publications
13H-index
427Citations
Publications 76
Newest
#1Seulbi Lee (PNU: Pusan National University)H-Index: 3
#2Jae Hyun Yu (Daegu University)
Last. Yoon Suk Choi (PNU: Pusan National University)H-Index: 14
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Abstract null null Low- and medium-C steel powders were additively deposited on gray cast iron using a directed energy deposition (DED) process to identify the effect of the carbon content in the steel powder on the soundness of DED-processed cast iron in terms of the mechanical and microstructural properties. As a representative mechanical property, impact toughness tests of DED-processed cast iron specimens were performed, and then fractography was employed to understand the microstructure-dep...
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#1Do-Sik Shim (Korea Maritime and Ocean University)H-Index: 13
Abstract null null This paper deals with the fabrication of porous materials using direct energy deposition, which is a versatile 3D printing technique for metals. To manufacture a porous material, a mixture consisting of AlSi12 powder and a foaming agent (ZrH2) is sprayed onto an aluminum substrate and subsequently fused with the substrate using a high-power laser beam. We examined the effects of the main process parameters, namely the laser power, scanning speed and foaming agent ratio, on the...
2 CitationsSource
Abstract null null Directed energy deposition (DED) can be used to repair damaged components. However, interfacial defects can occur between the repaired zone and substrate. Avoiding defects in repair processes using DED is critical because these defects significantly degrade the mechanical properties of the repaired parts. In this study, we investigated the occurrence of defects based on the laser power and powder feed rate. When experimenting with different powder feed rates (PFR), no defects ...
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#1Ye eun Jeong (Korea Maritime and Ocean University)
#2Gwang Yong Shin (KITECH)H-Index: 3
Last. Do-Sik Shim (Korea Maritime and Ocean University)H-Index: 13
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Abstract null null The elevated hardness of high‑carbon tool steel (M2) powder makes it an effective material for hardfacing components requiring strong wear resistance. However, if the brittle M2 powder is deposited on a ductile substrate, significant stress occurs during cooling, leading to defects, such as cracks at the interface between the substrate and deposited regions. Therefore, in this study, ductile P21 powder was deposited as a buffer layer between the substrate and the deposited M2 ...
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#1Chanjin Kim (Korea Maritime and Ocean University)
#2Sang-Hu Park (PNU: Pusan National University)H-Index: 13
Last. Do-Sik Shim (Korea Maritime and Ocean University)H-Index: 13
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This study examines the effects of ultrasonic nanocrystal surface modification (UNSM) on D2 cold-work tool steel materials. Specifically, the effect on surface topology and mechanical properties due to different UNSM conditions is examined. Before UNSM treatment, the substrate is processed via a quenching and tempering (QT) treatment for different values of substrate hardness. We observed surface changes due to UNSM treatments in D2 substrates and examined the correlation between topology change...
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1 CitationsSource
#3Hyub LeeH-Index: 6
Last. Do-Sik ShimH-Index: 13
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#2Do-Sik ShimH-Index: 13
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#2Hyub LeeH-Index: 6
Last. Do-Sik ShimH-Index: 13
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#2Min-seob KimH-Index: 1
Last. Do-Sik ShimH-Index: 13
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