Gi-Jeong Seo
Tennessee Technological University
Ultimate tensile strengthFerrite (iron)Composite materialIndentation hardnessIntergranular corrosionMetallurgyMaterials scienceWeldingInconel 625Austenitic stainless steelPitting corrosionWeld metalAtmospheric temperature rangeGas metal arc weldingVolume fractionAnnealing (metallurgy)Arc (geometry)MicrostructureAusteniteDuplex (building)
11Publications
4H-index
26Citations
Publications 12
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#1Md. R. U. Ahsan (Tennessee Technological University)H-Index: 5
#2Gi-Jeong Seo (Tennessee Technological University)H-Index: 4
Last. Duck Bong Kim (Tennessee Technological University)H-Index: 11
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Abstract null null The goal of this study is to investigate the wire + arc additive manufacturing (WAAM) of a high-entropy alloy (HEA) and to identify the near-optimal process parameters. To achieve the goal, a two-stage investigation is attempted using pre-alloyed and extruded Al0.1CoCrFeNi wire. In the first stage, single-layer beads are deposited with a range of process parameters (current, wire feed speed, and travel speed). Through process-signal monitoring, bead cross-section measurements,...
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#1Md. R. U. Ahsan (Tennessee Technological University)H-Index: 5
#2Xuesong Fan (UT: University of Tennessee)H-Index: 4
Last. Duck Bong Kim (Tennessee Technological University)H-Index: 11
view all 8 authors...
Abstract Bimetallic additively manufactured structures (BAMSs) can replace traditionally-fabricated functionally-graded-components through fusion welding processes and can eliminate locally-deteriorated mechanical properties arising from post-processing. The 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) system. Elemental mapping shows a smooth compositiona...
4 CitationsSource
#1A. N. M. Tanvir (Tennessee Technological University)H-Index: 4
#2Md. R. U. Ahsan (Tennessee Technological University)H-Index: 5
Last. Duck Bong Kim (Tennessee Technological University)H-Index: 11
view all 10 authors...
Abstract Wire + arc additive manufacturing (WAAM) is considered an innovative technology that can change the manufacturing landscape in the near future. WAAM offers the benefits of inexpensive initial system setup and a high deposition rate for fabricating medium- and large-sized parts such as die-casting tools. In 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...
5 CitationsSource
Due to the complexity of and variations in additive manufacturing (AM) processes, there is a level of uncertainty that creates critical issues in quality assurance (QA), which must be addressed by time-consuming and cost-intensive tasks. This deteriorates the process repeatability, reliability and part reproducibility. So far, many AM efforts have been performed in an isolated and scattered way over several decades. In this paper, a systematically integrated holistic view is proposed to achieve ...
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This study investigates the mechanical properties of the wire + arc additively manufactured Inconel 625 thin wall. The first part of this study focused on the microstructural features of the material after time-based annealing. This second part discusses the tensile strength and microhardness of the material after the same annealing procedure (980 °C, hold time 30 min, 1 h, and 2 h). It is found that the annealing procedure improved the ultimate tensile strength by 5%. Although the yield strengt...
4 CitationsSource
#1Md. R. U. Ahsan (Tennessee Technological University)H-Index: 5
#2A. N. M. Tanvir (Tennessee Technological University)H-Index: 4
Last. Duck Bong Kim (Tennessee Technological University)H-Index: 11
view all 10 authors...
Abstract A bimetallic additively-manufactured structure (BAMS) is a type of functionally-graded multi-material structure used for achieving different complementary material properties within the same structure as well as cost optimization. Wire + arc additive manufacturing (WAAM) offers the capability to fabricate the BAMS in a simultaneous or sequential way. To fully utilize the benefits of the BAMS, the interfacial joint should be strong, and each of the constituents should have reasonable mec...
13 CitationsSource
A deposited metal specimen of ER2594 which is a super duplex steel welding wire used to investigate the effect of sigma() phase on electrochemical corrosion characteristics was prepared by gas tungsten arc welding. Aging treatment was conducted for the specimen at the temperature range of to for 5 to 300 minutes after annealing at . Corrosion current density has decreased a little with an increase of aging time over 60 minutes at to and the uniform corrosion of deposited metal had more influence...
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#1Jae Hyoung LeeH-Index: 2
#1Jae-Hyoung LeeH-Index: 2
Last. Chang-Yong KangH-Index: 1
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A specimen of weld metal was prepared by GTA welding with weld wire of super duplex stainless steel. Aging treatment was conducted for the sample at the temperature range of 700 to for 5 to 300 minutes. The effect of aging temperature and time to pitting corrosion of weld metal has been investigated and the results were derived as follows. The volume fraction of phase tends to increase with an increase of aging temperature and time. Pitting potential Ep representing pitting corrosion was found t...
1 CitationsSource