47 Result(s)
within
Changhee Lee
English
Manufacturing, Machines, Tools, Processes
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Article
Effect of dilution on the behavior of solidification cracking in PTAW overlay deposit on Ni-Base superalloys
In this study, the effects of dilution on the solidification cracking susceptibility of PTAW (Plasma Transferred Arc Welding) Inconel 625 and 718 overlay on Nimonic 80A were observed. In order to evaluate soli...
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Article
Effects of Silver Addition on Properties and Performance of Plasma Sprayed La0.6Sr0.4Co0.2Fe0.8O3−δ Interconnect Layer
Interconnect layers on stainless steel substrates (STS430) for solid oxide fuel cells (SOFC) were built up by atmospheric plasma spraying (APS) using spray dried La0.6Sr0.4Co0.2Fe0.8O3−δ (LSCF) and blended LSCF/A...
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Article
Editorial
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Article
The Effects of Successive Impacts and Cold Welds on the Deposition Onset of Cold Spray Coatings
In this study, the impact and deposition behavior of nickel particles onto relatively soft 6061-T6 aluminum alloy and copper substrates in a kinetic spray process was investigated by comparing individual parti...
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Article
An Experimental and Finite Element Study of Cold Spray Copper Impact onto Two Aluminum Substrates
The effect of cold spray temperature and substrate hardness on particle deformation and adhesion has been studied, with particular emphasis on adiabatic shearing leading to melting. Copper particles were cold ...
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Article
Cracking behavior in a dissimilar weld between high silicon nodular cast iron and ferritic stainless steel
In this work, the microstructural evolution and cracking behavior of a dissimilar weld between high silicon nodular cast iron and ferritic stainless steel was investigated. An austenitic filler metal (Y309) wa...
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Article
Effect of Thermally Softened Bronze Matrix on the Fracturing Behavior of Diamond Particles in Hybrid Sprayed Bronze/Diamond Composite
In our previous study (Na et al., Compos Sci Technol 69:463-468, 2009), optimized thickness of protective nickel film was proposed for smaller diamond feedstock to obtain reduced impact stress and uniform flig...
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Article
Erratum to: Editorial
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Article
Variation of microstructures and mechanical properties in the post-weld heat-treated HAZ of Cu containing HSLA steel welds
The present study focuses on the effect of Cu and post-weld heat treatment (PWHT) on the microstructure and mechanical properties in the coarse grained heat affected zone (CGHAZ) of Cu containing high strength...
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Article
Influence of the interface temperature and strain gradients on the impact energy model of a soft particle on a hard substrate during kinetic spraying
In this study, the individual particle impact behaviors of a soft particle on a hard substrate during a kinetic spraying operation were observed. The ratio of the bonds was compared to the difference between t...
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Article
Dependence of Bonding Mechanisms of Cold Sprayed Coatings on Strain-Rate-Induced Non-Equilibrium Phase Transformation
Strain-rate-induced amorphization at the impact interface of Ni-Cu was observed in a cold spray process by high-resolution transmission electron microscopy. Based on finite element analysis for the evolution o...
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Article
Evaluation of Die-Soldering and Erosion Resistance of High Velocity Oxy-Fuel Sprayed MoB-Based Cermet Coatings
Soldering and erosion are two of the biggest serious problems faced in the die-casting industries. Cermet coatings utilized by high-velocity oxy-fuel (HVOF) spray technology have been developed in an attempt t...
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Article
Liquation behavior in the weld HAZ of high Si nodular iron
In the present study, liquation behavior including the constitutional liquation phenomena in the weld heataffected zone (HAZ) of nodular cast iron with 4% Si was investigated. The thermal cycle of the weld HAZ...
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Article
Behavior of Cu precipitates during thermo-mechanical cycling in the weld CGHAZ of Cu-containing HSLA steel
The behavior of Cu precipitates in the weld coarse-grained heat-affected zone (CGHAZ) of 1.5 wt% Cucontaining high strength low-alloy (HSLA) steel subjected to a thermal/thermo-mechanical welding cycle and pos...
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Article
Cold cracking susceptibility of boron added high-strength bainitic steels
This study evaluated the cold cracking susceptibility of high-strength bainitic steels having a strength level of over 800 MPa and 1.1 GPa according to their respective chemical compositions. For evaluation of...
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Article
Role of Ca treatment in hydrogen induced cracking of hot rolled API pipeline steel in acid sour media
The effect of Ca treatment on hydrogen-induced cracking (HIC) resistance of hot rolled pipeline steel was evaluated. HIC testing was carried out in acidic condition according to NACE standard; results clearly ...
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Article
Restoration of face-centered cubic metals subjected to kinetic spraying
Deformation mode and restoration of face-centered cubic (FCC) metal (Al, Ni, and Cu) particles subjected to kinetic spraying (KS) were investigated. The FCC metal particles were accelerated to supersonic veloc...
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Article
Direct top–down fabrication of nanoscale electrodes for organic semiconductors using fluoropolymer resists
We report the use of a fluoropolymer resist for the damage-free e-beam lithographic patterning of organic semiconductors. The same material is also shown to be suitable as an orthogonal electron beam resist fo...
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Article
Deposition Behavior and Microstructural Features of Vacuum Kinetic Sprayed Aluminum Nitride
The vacuum kinetic spray (VKS) method is a relatively advanced technology by which thin and dense ceramic coatings can be fabricated via the high-speed impact of submicron-sized particles at room temperature. ...
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Article
Effect of Process Gas Flow on the Coating Microstructure and Mechanical Properties of Vacuum Kinetic-Sprayed TiN Layers
TiN films were fabricated on glass substrate by a vacuum kinetic spray method to investigate the effect of process gas flow rate, which determines particle velocity, on coating microstructure, and the mechanic...
