Article
Materials Science, Multidisciplinary
Runguang Li, Youkang Wang, Ning Xu, Zhiran Yan, Shilei Li, Minghe Zhang, Jonathan Almer, Yang Ren, Yan-Dong Wang
Summary: Laser shock-peening (LSP) can create complex gradients in microstructures and residual stresses, leading to improved mechanical properties of metallic engineering components. A non-destructive high-energy X-ray diffraction technique was used to investigate the effects of LSP on microstructure, surface topography, and residual stress in high purity titanium plates. LSP was found to generate large compressive in-plane residual stresses near the peened surface, gradually decreasing to zero below the surface. During in-situ tensile loading, stress partitioning and work-hardening rates were measured as a function of depth. The surface region exhibited the highest work-hardening rate and remained mechanically stable until sample failure.
Article
Chemistry, Physical
Zheng Zhang, Yongkang Zhang, Mark O'Loughlin, Jinxing Kong
Summary: The study investigated the impact of laser shock peening on the thickness of Al7055-T7751 plates and found that geometry thickness not only affects bending stiffness and macroscopic deformation, but also plays a significant role in the evolution of residual stress across the entire section. Thick plates tended to inherit consistent plane stress states due to their relatively small deformation compatibility as a result of high stiffness.
SURFACES AND INTERFACES
(2021)
Article
Optics
Phani Mylavarapu, Chinmai Bhat, Manoj Kumar Reddy Perla, Kumkum Banerjee, K. Gopinath, T. Jayakumar
Summary: Laser Shock Peening (LSP) is a promising surface treatment process for inducing beneficial compressive surface residual stresses in fatigue critical components. Finite element modeling plays an important role in optimizing process parameters, and there exists a critical material thickness depending on spot diameter below which the effects of back reflection are predominant. In this study, an alternative modeling strategy was used to discuss the effect of thickness on the back reflection of shock waves and its subsequent effect on residual stresses induced.
OPTICS AND LASER TECHNOLOGY
(2021)
Article
Optics
Min Cai, Hui Li, Hui Li, Shengnan Shen, Junwen Lu, Bo Zheng
Summary: Laser shock peening (LSP) was used to treat aircraft landing gear 50CrVA alloy, resulting in improved mechanical properties. Numerical simulations showed that adjusting laser energy and spot diameter can effectively enhance the compressive residual stress (CRS) of metals, and the spot diameter has a greater impact on the uniformity of the CRS distribution. Experimental studies revealed that LSP treatment increased surface CRS, refined grains, and improved the mechanical properties of the 50CrVA alloy.
OPTICS AND LASER TECHNOLOGY
(2024)
Article
Materials Science, Multidisciplinary
Sunil Pathak, Sanin Zulic, Jan Kaufman, Jaromir Kopecek, Ondrej Stransky, Marek Bohm, Jan Brajer, Libor Beranek, Ashish Shukla, Michal Ackermann, Filip Vele, Tomas Mocek
Summary: This study investigates the post-processing of additively manufactured stainless steel (SS) 304 L samples through laser shock peening (LSP). The results show significant improvements in compressive residual stresses and surface morphology. These findings contribute to a better understanding of the LSP mechanism in the post-processing of AM parts.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Materials Science, Multidisciplinary
Nan Li, Qiang Wang, Wenjuan Niu, Liucheng Zhou, Peng Han, Yu Han, Jiaxu Li, Pu Song, Ning Hu, Nan Guo, Shenao Li, Xinlei Pan
Summary: Laser shock peening (LSP) is an advanced surface-strengthening technology suitable for strengthening high-energy beam additive manufacturing components. The study found that multiple LSP impacts can decrease the average grain size and increase the dislocation density of wire-based laser directed energy deposition (LDED) 17-4 PH stainless steel. It also converts the residual stress from tensile to compressive state and significantly improves microhardness and wear resistance.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Engineering, Manufacturing
Jiantao Zhou, Xin Zhou, Hui Li, Jiawei Hu, Xu Han, Sheng Liu
Summary: In this study, the in-situ laser shock peening method is used for the first time to improve the surface quality and mechanical properties of L-DED-fabricated AlSi10Mg alloy. The results show that severe plastic deformation driven by the shock wave contributes to defect healing, and the maximum pressure plays a crucial role. Surface laser shock peening (SLSP) and layer-by-layer laser shock peening (LLSP) have positive effects on the densification, surface quality, microstructure, and mechanical properties of the samples. The LLSP treatment addresses the strength-ductility trade-off and achieves an excellent combination of strength and ductility through grain refinement, dislocation strengthening, and compressive residual stress.
ADDITIVE MANUFACTURING
(2022)
Article
Materials Science, Ceramics
Fei Wang, Xin Chen, Daniel P. DeLellis, Amanda R. Krause, Yongfeng Lu, Bai Cui
Summary: A novel high-temperature laser shock peening process was applied to polycrystalline alpha-SiC to introduce a maximum compressive residual stress of 650 MPa, which increased the nanohardness and in-plane fracture toughness of alpha-SiC. This work demonstrates the potential of HT-LSP for improving the mechanical properties of brittle ceramics.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2022)
Article
Chemistry, Physical
Yongtao Bai, Hao Wang, Shuhong Wang, Yihui Huang, Yao Chen, Wenwu Zhang, Andreas Ostendorf, Xuhong Zhou
Summary: Nanosecond laser shock peening improves the life cycle performance of high-strength steel by inducing higher microhardness, corrosion resistance, and fatigue life through microstructures formation. Additionally, compressive residual stress can be found in the treated area to enhance the material properties.
APPLIED SURFACE SCIENCE
(2021)
Article
Materials Science, Multidisciplinary
Jiaxuan Chi, Zhongyi Cai, Hepeng Zhang, Hongqiang Zhang, Wei Guo, Zhandong Wan, Guofeng Han, Peng Peng, Zhi Zeng
Summary: The combined manufacturing of direct energy deposition (DED) and laser shock peening (LSP) shows great potential in repairing titanium alloy components and improving their mechanical properties. This study evaluated the effects of LSP on microstructures, residual stress, and tensile properties of DEDed samples, finding that LSP induces a high-level compressive residual stress state and microstructure refinement, leading to an improvement in ultimate tensile strength.
MATERIALS & DESIGN
(2021)
Article
Materials Science, Ceramics
Pratik Shukla, X. Shen, Ric Allott, Klaus Ertel, S. Robertson, R. Crookes, H. Wu, A. Zammit, P. Swanson, M. E. Fitzpatrick
Summary: This study investigates the effects of multi-layer, square-beam laser shock treatment on Si3N4 ceramics, showing an increase in surface toughness and reduction in crack size. Compressive residual stresses measured play a key role in improving the ceramic material, indicating a new understanding of the response of Si3N4 ceramics to laser shock treatment.
CERAMICS INTERNATIONAL
(2021)
Article
Engineering, Mechanical
Jianfeng Zhao, Xinlei Pan, Jian Li, Zhiyong Huang, Qianhua Kan, Guozheng Kang, Liucheng Zhou, Xu Zhang
Summary: Systematic characterization of microstructure, mechanical testing and constitutive modeling were conducted to investigate the effects of laser shock peening (LSP) treatment on the tensile properties of Ti-6Al-4 V alloy. The study revealed that LSP treatment resulted in grain refinement and introduction of compressive residual stress, leading to changes in the material's elastic-plastic behavior. The established deformation mechanism-based model showed that surface grain refinement enhanced initial yielding and strain hardening, while residual stress had a weakening effect on initial yielding but little influence on strain hardening behavior.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2022)
Article
Chemistry, Physical
Hepeng Zhang, Zhongyi Cai, Jiaxuan Chi, Rujian Sun, Zhigang Che, Hongqiang Zhang, Wei Guo
Summary: This study investigated the fatigue crack growth behavior in residual stress fields induced by laser shock peening (LSP) on Ti6Al4V titanium alloy and found that LSP significantly extended the fatigue life. The significant crack retardation observed at high compressive stress levels was attributed to the reduction of local stress. The superposition principle combined with the weight function method was used to predict the fatigue crack growth rate in residual stress fields.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Optics
Wei Guo, Yongxin Zhang, Hao Sun, Hongqiang Zhang, Ying Zhu
Summary: Laser shock peening (LSP) is an advanced surface modification technology that can improve the mechanical properties of metal materials through inducing high-density dislocations and nanocrystallization. The magnitudes of compressive residual stress and microhardness are influenced by the LSP energy and impact times. LSP can significantly increase the fatigue life when the LSP area is perpendicular to the cracks, attributed to the effect of the wider region of the compressive residual stress field on reducing the crack propagation rate.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Optics
Wei Guo, Yongxin Zhang, Hao Sun, Hongqiang Zhang, Ying Zhu
Summary: This study investigated the effects of laser shock peening (LSP) on the microstructure, microhardness, residual stress, and fatigue crack growth (FCG) properties of TB10 titanium alloy. The results showed that LSP could induce high density dislocations, nano-crystallization, and increase compressive residual stress and microhardness. The fatigue test revealed that the LSP coverage area significantly impacted the FCG performance, with the fatigue life increasing by 40.2% when the LSP area was perpendicular to the cracks. This was attributed to the wider region of compressive residual stress perpendicular to the crack direction, which significantly reduced the FCG rate of early cracks.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Nanoscience & Nanotechnology
Soumyabrata Basak, Mounarik Mondal, Kun Gao, Sung-Tae Hong, Sam Yaw Anaman, Hoon-Hwe Cho
Summary: Experimental studies on friction stir butt-welded aluminum-clad-aluminum thin sheets were conducted, and the joint's microstructure and mechanical properties were evaluated using microscopy and analysis methods.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Shengwei Zhang, Kun Gao, Lihong Cai, Sam Yaw Anaman, Sung-Tae Hong, Hoon-Hwe Cho, Pai-Chen Lin, Heung Nam Han
Summary: This study investigates the solid-state joining of dissimilar stainless steels 316L and SUS410 using electrically assisted pressure joining (EAPJ). The results show that different electric current densities significantly affect the joint performance during compressive plastic deformation. Microstructure analysis confirms the fabrication of defect-free joints through elemental diffusion and recrystallization. The effect of electric current density on the formation of martensite and hardness variation is revealed. Additionally, the fatigue behavior of joints with different tensile strengths is evaluated, and the fracture mechanism is examined through the analysis of fracture surfaces.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Engineering, Manufacturing
Shengwei Zhang, Lihong Cai, Kun Gao, Sung-Tae Hong, Hoon-Hwe Cho, Dong-Hyun Kim, Tran Van Loi, Stephen Yeboah Boakye, Sam Yaw Anaman
Summary: This study achieves solid-state bulk joining of additively manufactured maraging steel and commercially available martensitic stainless steel through electrically assisted pressure joining (EAPJ). A porous layer is fabricated on the joining side using selective laser melting additive manufacturing, which significantly increases the maximum temperature and decreases the joining load. Both maraging steel and AISI410 experience grain refinement during microstructure evolution. Tensile tests indicate that fracture always occurs in the transition region between the heat-affected region and the unaffected base metal region. The use of an additively manufactured porous layer makes it easier and more effective to achieve bulk joining of components, even for dissimilar materials.
ADDITIVE MANUFACTURING
(2022)
Article
Metallurgy & Metallurgical Engineering
Sam Yaw Anaman, Jaekook Kim, Jong-Sook Lee, Jeong-Mook Choi, Hoon-Hwe Cho, Sung-Tae Hong
Summary: This study establishes a numerical model to study the galvanic corrosion behaviors of different materials in a friction stir welded joint. The effects of electrolyte depth and cathode-to-anode surface area ratios on the galvanic corrosion behaviors are investigated through experimental validation and electrochemical simulations.
STEEL RESEARCH INTERNATIONAL
(2023)
Article
Metallurgy & Metallurgical Engineering
Thanh Thuong Do, Siwhan Lee, Thi Tu Anh Bui, Thi Anh Nguyet Nguyen, Jong-Seok Lee, Heung Nam Han, Sung-Tae Hong
Summary: In this study, the simultaneous joining and forming of dissimilar steels were experimentally investigated using electrically assisted pressure joining (EAPJ) method. The results showed that sound solid-state joints were successfully fabricated and a target geometry was also successfully formed. The method can cause grain refinement and induce different microstructural changes in different zones, confirming the applicability of EAPJ in the simultaneous joining and forming of dissimilar steels.
STEEL RESEARCH INTERNATIONAL
(2023)
Article
Green & Sustainable Science & Technology
Shengwei Zhang, Lihong Cai, Thi Anh Nguyet Nguyen, Meiling Geng, Kun Gao, Sung-Tae Hong, Moon-Jo Kim
Summary: Electrically assisted rapid heat treatment can balance the strength and formability of aluminum clad steel sheets by forming different intermetallic compounds that affect the interfacial bonding strength and mechanical properties. With the appropriate current density, improved elongation and interfacial bonding strength can be achieved.
INTERNATIONAL JOURNAL OF PRECISION ENGINEERING AND MANUFACTURING-GREEN TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Hwi Jun Son, Young Cheol Jeong, Bo Wook Seo, Sung-Tae Hong, Yu-Chan Kim, Young Tae Cho
Summary: Researchers conducted experiments on high-hardness armor steel plates using different welding methods to reduce the weight of combat vehicles and enhance bulletproof performance and durability. The results showed that the mechanical strength of the welded zone and the integrity of the welding process deteriorated as the CO2 content and heat input increased.
Article
Materials Science, Multidisciplinary
Kun Gao, Soumyabrata Basak, Shengwei Zhang, Sung-Tae Hong, Stephen Yeboah Boakye, Hoon-Hwe Cho
Summary: The microstructural characteristics and mechanical properties of friction stir lap welding (FSLW) of thin Al-clad Al and ultra-thin Al-clad mild steel sheets were investigated experimentally. The FSLW joints were successfully fabricated with no noticeable defects. The material flow was found to be asymmetrical between the advancing side (AS) and the retreating side (RS) of the stir zone (SZ). Fatigue tests showed different crack propagation modes due to the asymmetric geometry of the joint and different loading configurations.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Nanoscience & Nanotechnology
Vinh Phu Nguyen, Inseok Jeon, Seunghwa Yang, Seung Tae Choi
Summary: Understanding the pyrolysis process of polymer materials is crucial for designing and applying thermal protection systems. This study uses coarse-grained molecular dynamics simulations to bridge the gap between atomistic simulations and continuum modeling. By simulating the pyrolysis process of polyethylene at the mesoscale, important thermal degradation properties for continuum-scale simulations can be predicted. This work serves as an initial investigation of polymer pyrolysis at the mesoscale and enhances our understanding of the concept at a larger scale.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Engineering, Industrial
Lihong Cai, Shengwei Zhang, Kun Gao, Van Loi Tran, Meiling Geng, Koo-Hyun Chung, Sung-Tae Hong
Summary: A combination of volatile medium (liquid CO2) and additive manufactured (AMed) die is suggested for achieving lubrication and quenching during hot stamping of aluminum alloys (AAs). The liquid CO2 serves as a lubricant and coolant, and is directly applied to the heated AA blank through the AMed die with confusor microholes. This approach reduces friction and induces solid solution treatment in the formed blank, facilitating subsequent artificial aging process.
CIRP ANNALS-MANUFACTURING TECHNOLOGY
(2023)
Article
Chemistry, Physical
Raji Atchudan, Suguna Perumal, Thomas Nesakumar Jebakumar Immanuel Edison, Ashok K. Sundramoorthy, Namachivayam Karthik, Sambasivam Sangaraju, Seung Tae Choi, Yong Rok Lee
Summary: Heteroatom-doped porous carbon material (H-PCM) was synthesized from cashew nut's skin through a simple pyrolysis route. The synthesized H-PCM exhibited a porous structure with sponge-like and sheet-like morphology, as well as a moderate degree of graphitization/crystallinity and various functionalities. The as-prepared H-PCM showed excellent electrocatalytic activity for hydrogen evolution reaction (HER) in 0.5 M H2SO4 aqueous solution, making it a promising candidate for metal-free carbonaceous catalysts in large-scale hydrogen production through electrochemical water splitting.
Article
Mechanics
In -Jun Jung, Seung Tae Choi, Seung-Hwan Chang
Summary: This study introduces a hybrid cloth-type electronic device composed of PVDF and ordinary fiber yarns, and experimental protocols are used to check its feasibility as a wearable electronic device. The magnitude of the generated voltage signal under impact loading is experimentally investigated, and the most appropriate weaving pattern is suggested. After conducting various electro-mechanical tests and a washing test, the proposed hybrid cloth-type electronic device is found to have adequate potential for use in self-powered wearable electronic devices.
COMPOSITE STRUCTURES
(2023)
Review
Engineering, Manufacturing
Sutanuka Mohanty, Soumyabrata Basak, Debasis Saran, Kajari Chatterjee, Turin Datta, Atul Kumar, Chandra Prakash, Doo-Man Chun, Sung-Tae Hong, Kisor Kumar Sahu
Summary: The selection and classification of materials for demanding applications in aviation/space, nuclear, oil & gas industries remain challenging due to the high requirements for microstructural, mechanical, and electrochemical properties. Surface engineering is crucial in controlling the properties of exposed surfaces, which play key roles in interactions with other materials and exposure to the environment, promoting desired chemical reactions, and preventing corrosion. This review focuses on the latest and most advanced surface engineering techniques such as laser, electron beam, friction stir processing, ion beam, and plasma immersion ion implantation, which significantly improve wear and corrosion resistance, reduce frictional losses, increase fatigue life, and enhance chemical stability at high temperatures for exotic applications.
INTERNATIONAL JOURNAL OF PRECISION ENGINEERING AND MANUFACTURING
(2023)
Review
Engineering, Manufacturing
Meiling Geng, Lihong Cai, Jin-Cheol Kim, Hyeon-Seok Choi, Sung-Tae Hong
Summary: Dry metal forming (DMF) is a sustainable metal forming process with economic and ecological benefits. Adopting appropriate strategies for dry forming tools and lubrication is crucial for successful DMF. This paper reviews the research on DMF development to promote its implementation as an alternative to conventional lubrication systems in metal forming processes.
INTERNATIONAL JOURNAL OF PRECISION ENGINEERING AND MANUFACTURING
(2023)
Article
Engineering, Manufacturing
Ji-Won Kang, Shengwei Zhang, Tu-Anh Bui Thi, Sung-Tae Hong, Siwhan Lee, Heung Nam Han
Summary: This study proposes a friction-assisted solid state lap joining process for dissimilar metal pipes, specifically joining copper (Cu) and aluminum (Al) pipes. The process consists of two stages, where in the first stage, the Cu pipe rotates with a mandrel against the inner surface of the Al pipe to break oxide layers and increase temperature at the interface. In the second stage, as the contact surface area between Cu and Al pipes increases due to linear motion of the mandrel, diffusion bonding occurs as the mandrel rotates alone against the stationary Cu pipe. Microstructural analysis and mechanical testing confirm the successful achievement of solid state lap joining between Cu and Al pipes for a lightweight heat exchanging component.
INTERNATIONAL JOURNAL OF PRECISION ENGINEERING AND MANUFACTURING
(2023)
