Chong Soo Lee
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View article: Enhanced kinetics of microstructural evolution in Ti–6Al–4V through electropulsing treatment
Enhanced kinetics of microstructural evolution in Ti–6Al–4V through electropulsing treatment Open
The post-processing of Ti–6Al–4V, which has traditionally been conducted using furnace heat treatment (FHT), is crucial to attaining the optimum microstructure and mechanical performance. This study investigated the microstructural kinetic…
View article: Hetero-Deformation Induced Hardening in a CoCrFeNiMn High-Entropy Alloy
Hetero-Deformation Induced Hardening in a CoCrFeNiMn High-Entropy Alloy Open
One of the most important issues in materials science is to overcome the strength–ductility trade-off in engineering alloys. The formation of heterogeneous and complex microstructures is a useful approach to achieving this purpose. In this…
View article: Effect of concurrent accumulative roll bonding (ARB) process and various heat treatment on the microstructure, texture and mechanical properties of AA1050 sheets
Effect of concurrent accumulative roll bonding (ARB) process and various heat treatment on the microstructure, texture and mechanical properties of AA1050 sheets Open
© 2022 The AuthorsThis study investigated the microstructure, texture, and mechanical properties of 1050 aluminum alloy sheets that underwent the accumulative roll bonding (ARB) method. The ARB proceeded up to eight passes in three ways: c…
View article: Effect of type-C liquid metal embrittlement on mechanical properties of spot-welded TRIP steel
Effect of type-C liquid metal embrittlement on mechanical properties of spot-welded TRIP steel Open
Type-C liquid metal embrittlement (LME) crack refers to an internal crack in the heat-affected zone near the notch area. In contrast to type-A and type-B LME, the type-C LME has rarely been studied for its effect on the mechanical properti…
View article: Tailoring Extra-Strength of a TWIP Steel by Combination of Multi-Pass Equal-Channel Angular Pressing and Warm Rolling
Tailoring Extra-Strength of a TWIP Steel by Combination of Multi-Pass Equal-Channel Angular Pressing and Warm Rolling Open
Increasing the yield stress of twinning-induced plasticity (TWIP) steels is a demanding task for modern materials science. This aim can be achieved by microstructure refinement induced by heavy straining. We feature the microstructural evo…
View article: Micromanufacturing of Metallic Materials
Micromanufacturing of Metallic Materials Open
Product miniaturization is a trend for facilitating product usage, enabling product functions to be implemented in microscale geometries, and aimed at reducing product weight, volume, cost and pollution. Driven by ongoing miniaturization i…
View article: Graded Grain Structure to Improve Hydrogen-Embrittlement Resistance of TWIP Steel
Graded Grain Structure to Improve Hydrogen-Embrittlement Resistance of TWIP Steel Open
The high strength of twinning-induced plasticity (TWIP) steels makes them vulnerable to the hydrogen embrittlement (HE) phenomenon, thereby limiting their potential applications. This study suggests inducing a graded grain structure (GGS) …
View article: Constitutive Analysis of the Anisotropic Flow Behavior of Commercially Pure Titanium
Constitutive Analysis of the Anisotropic Flow Behavior of Commercially Pure Titanium Open
Plastic anisotropy is an important issue for metals possessing a hexagonal close-packed structure. This study investigated the anisotropic deformation characteristics of commercially pure titanium with basal texture. A quasi-static uniaxia…
View article: Microstructural Influence on Stretch Flangeability of Ferrite–Martensite Dual-Phase Steels
Microstructural Influence on Stretch Flangeability of Ferrite–Martensite Dual-Phase Steels Open
This work investigated the microstructural effect on stretch flangeability of ferrite–martensite dual-phase (DP) steels. Three types of DP steels with various martensitic structures were prepared for the research: fibrous martensite in wat…
View article: Recent Development in Micromanufacturing of Metallic Materials
Recent Development in Micromanufacturing of Metallic Materials Open
Product miniaturization is a trend for facilitating product usage, enabling product functions to be implemented in microscale geometries, and aimed at reducing product weight, volume, cost and pollution. Driven by ongoing miniaturization i…
View article: Ultrahigh high-strain-rate superplasticity in a nanostructured high-entropy alloy
Ultrahigh high-strain-rate superplasticity in a nanostructured high-entropy alloy Open
Superplasticity describes a material’s ability to sustain large plastic deformation in the form of a tensile elongation to over 400% of its original length, but is generally observed only at a low strain rate (~10 −4 s −1 ), which results …
View article: Ambivalent Role of Annealing in Tensile Properties of Step-Rolled Ti-6Al-4V with Ultrafine-Grained Structure
Ambivalent Role of Annealing in Tensile Properties of Step-Rolled Ti-6Al-4V with Ultrafine-Grained Structure Open
Step rolling can be used to mass-produce ultrafine-grained (UFG) Ti-6Al-4V sheets. This study clarified the effect of subsequent annealing on the tensile properties of step-rolled Ti-6Al-4V at room temperature (RT) and elevated temperature…
View article: Hydrogen Embrittlement Behavior of 18Ni 300 Maraging Steel Produced by Selective Laser Melting
Hydrogen Embrittlement Behavior of 18Ni 300 Maraging Steel Produced by Selective Laser Melting Open
A study was performed to investigate the hydrogen embrittlement behavior of 18-Ni 300 maraging steel produced by selective laser melting and subjected to different heat treatment strategies. Hydrogen was pre-charged into the tensile sample…
View article: Comparative study on the effects of Cr, V, and Mo carbides for hydrogen-embrittlement resistance of tempered martensitic steel
Comparative study on the effects of Cr, V, and Mo carbides for hydrogen-embrittlement resistance of tempered martensitic steel Open
In this study, the ideal alloying element (among Cr, V, and Mo carbides) to enhance the resistance to hydrogen embrittlement (HE) in a tempered martensitic steel was investigated. Four types of steels were designed to contain cementites, C…
View article: Simultaneous Improvement in the Strength and Formability of Commercially Pure Titanium via Twinning-induced Crystallographic Texture Control
Simultaneous Improvement in the Strength and Formability of Commercially Pure Titanium via Twinning-induced Crystallographic Texture Control Open
The rolling texture formed in the conventional cold rolling process of commercially pure titanium (CP-Ti) for producing a metal sheet significantly limits the potential applications of CP-Ti sheets in various industrial sectors by impairin…
View article: Event-triggered proportional-derivative control for nonlinear network systems with a novel event-triggering scheme: Differential of triggered state consideration
Event-triggered proportional-derivative control for nonlinear network systems with a novel event-triggering scheme: Differential of triggered state consideration Open
This article proposes event-triggered proportional-derivative control for a class of nonlinear network control systems. For derivative action of the proposed proportional-derivative control, a novel event-triggering scheme is devised toget…
View article: Enhanced Resistance to Delayed Cracking in Deep-drawn Lean Duplex Stainless Steel: the Role of Residual Stress
Enhanced Resistance to Delayed Cracking in Deep-drawn Lean Duplex Stainless Steel: the Role of Residual Stress Open
The delayed cracking behavior of deep-drawn lean duplex stainless steel (LDSS) was investigated, and compared with that of conventional metastable austenitic stainless steels (MASS). Hydrogen charging was performed by electrochemical metho…
View article: Multicriteria Adaptive Observers for Singular Systems with Unknown Time‐Varying Parameters
Multicriteria Adaptive Observers for Singular Systems with Unknown Time‐Varying Parameters Open
This paper proposes multicriteria adaptive observers for a class of singular systems with unknown time‐varying parameters. Two criteria for the H ∞ disturbance attenuation level and the upper bound of an ultimate invariant set are scalariz…