A5087871795- Additive Manufacturing Materials and Processes
- High Entropy Alloys Studies
- Welding Techniques and Residual Stresses
- Additive Manufacturing and 3D Printing Technologies
- Advanced Fiber Optic Sensors
- Photonic and Optical Devices
- Laser-induced spectroscopy and plasma
- Laser Material Processing Techniques
- Solidification and crystal growth phenomena
- Titanium Alloys Microstructure and Properties
- Aluminum Alloy Microstructure Properties
- High-Temperature Coating Behaviors
- Advanced Fiber Laser Technologies
- Ion-surface interactions and analysis
- Advanced Battery Materials and Technologies
- Microstructure and mechanical properties
- Quantum Information and Cryptography
- Metal and Thin Film Mechanics
- Advancements in Battery Materials
- Analytical chemistry methods development
- Near-Field Optical Microscopy
- Advanced materials and composites
- Nonlinear Dynamics and Pattern Formation
- Advanced Sensor and Control Systems
- Plasmonic and Surface Plasmon Research
Hunan University
2013-2024
Songshan Lake Materials Laboratory
2024
Guangdong Medical College
2024
Sun Yat-sen University
2023
Shanxi University of Traditional Chinese Medicine
2005-2022
State Key Laboratory of Quantum Optics and Quantum Optics Devices
2018-2020
East China Jiaotong University
2019-2020
Shanxi University
2010-2020
University of Science and Technology Beijing
2020
University of Michigan
2006-2015
Direct metal deposition (DMD) is a rapid laser-aided method that can be used to manufacture near-net-shape components from their computer aided design (CAD) files. The produce fully dense or porous metallic parts. Ti-6Al-4V alloy widely as an implantable material mainly in the application of orthopedic prostheses because its high strength, low elastic modulus, excellent corrosion resistance, and good biocompatibility. In present study, scaffold has been fabricated by DMD technology for...
Laser cladding is a multiple-parameter-dependent process, and feedback control critical for the process stabilization. This paper presents generalized predictive strategy with input constraints to stabilize melt pool temperature during high-power diode laser process. A dual-color pyrometer was used monitor temperature. state-space dynamic model relating drive signal (laser power) identified experimentally using subspace method. controller implemented in real time model. The closed-loop able...
Laser additive manufacturing has gained widespread adoption in recent years. However, process diagnosis and control lag behind the progresses of other key technologies, which make product quality a challenging problem. This work proposes an operating parameter conditioned support vector regression (SVR) method that uses processing kernel function to achieve independent in-situ composition prediction. Two different features laser-induced plasma, spectral line-intensity-ratio, both...
In this study, a multi-scale model that integrates macro-scale transient three-dimensional mass and heat transfer micro-scale thin-interface phase-field is developed to simulate the solidification behavior of molten pool dendritic growth for direct energy deposition process. Both longitudinal morphology primary arm spacing (PDAS, Λ) columnar dendrites are validated by experiments. As revealed from simulation, velocity Vs temperature gradient G coupled with an opposite trend, cooling rate R...
The heterogeneous trans-scale structures play important roles in achieving high strength and toughness austenitic stainless steels fabricated by directed energy deposition (DED). In this study, systematic annealing investigations were demonstrated the evolution of such as dislocations, chemical cells, nano-oxides, grains recrystallization behavior. Their effects on yield quantified. experimentally observed as-received annealed samples agrees well with estimated using standard Taylor...
The relationship between solidification structure and cooling rate is critical for optimizing processing parameters to achieve desired mechanical property of additive manufactured parts. However, the establishment above during laser manufacturing (LAM) still challenging. In present work, molten-pool temperature was experimentally measured using a two-color pyrometer LAM Inconel 718. among parameters, investigated. results showed that Nb segregation ratio decreases from 9.30 4.26 volume...
Epitaxial growth of dendrites often results in a strong texture, which is common phenomenon laser additive manufacturing process. In this study, pulsed lasers with flat-top and Gaussian intensity profiles were used to modulate the molten pool morphology solidification texture unidirectional scanning strategy. The melt planar for mode it turns arc-shaped mode. Long columnar grains are uniformly distributed fiber weak cube obtained sample due uniform heat flux through many deposition layers....
Real-time chromium composition analysis during direct metal deposition of pure and H13 tool steel materials was performed using optical emission spectroscopy the laser-induced plasma. Four second-order polynomial calibration curves were constructed spectral line intensity ratios between two neutral lines iron lines. Second-order also formed plasma temperature electron density. The obtained Boltzmann plot nine 370 nm 390 nm. density estimated Stark broadening Fe-I at 426.047 Chromium...