A5086480823- Additive Manufacturing Materials and Processes
- Additive Manufacturing and 3D Printing Technologies
- Welding Techniques and Residual Stresses
- Bone Tissue Engineering Materials
- Manufacturing Process and Optimization
- High Entropy Alloys Studies
- Titanium Alloys Microstructure and Properties
- Laser Material Processing Techniques
- Dental Implant Techniques and Outcomes
- Engineering Technology and Methodologies
- Advanced X-ray and CT Imaging
- Advanced machining processes and optimization
- Nuclear Materials and Properties
- Orthopaedic implants and arthroplasty
- Injection Molding Process and Properties
- Dental Radiography and Imaging
- Cellular and Composite Structures
- Dental materials and restorations
- 3D Printing in Biomedical Research
- Ultrasonics and Acoustic Wave Propagation
- Voice and Speech Disorders
- Facial Trauma and Fracture Management
- Dysphagia Assessment and Management
- Evolution and Paleontology Studies
- Calcium Carbonate Crystallization and Inhibition
Central University of Technology
2014-2023
Nanyang Technological University
2014
École Nationale d'Ingénieurs de Saint-Étienne
2010-2013
Université Claude Bernard Lyon 1
2012-2013
Selective laser melting (SLM) has great potential in additive manufacturing because it enables the production of full-density complex parts with desired inner structure and surface morphology. High temperature gradients as a result locally concentrated energy input lead to residual stresses, crack formation part deformation during processing or after separation from supports substrate. In this study, an X-ray diffraction technique numerical simulation were used for investigating stress SLM...
The article explores an evolution of a microstructure in AISI 420 martensitic stainless steel during selective laser melting. Several upper layers had hardness 750 HV and contained 21 ± 12 vol.% austenite phase. final bulk consisted thermally decomposed martensite with 500–550 unusually high, 57 8 vol.%, amount austenite. Obtained results indicate that manufacturing partitioning reversion took place, owing to the thermal cycling inner regions manufacturing. Numerical simulation was found...
Purpose Properties of the parts manufactured by selective laser melting (SLM) depend strongly on each single laser‐melted track and layer, as well strength connections between them. The purpose this paper to establish links principal SLM parameters (laser power density, scanning speed, layer thickness), properties powder geometrical characteristics tracks. This study will provide a theoretical technical basis for production from metal powders. Design/methodology/approach discusses affecting...
This article overviews the scientific results of microstructural features observed in 316 L stainless steel manufactured by laser powder bed fusion (LPBF) method obtained authors, and discusses with respect to recently published literature. Microscopic LPBF microstructure, i.e., epitaxial nucleation, cellular structure, microsegregation, porosity, competitive colony growth, solidification texture, were experimentally studied scanning transmission electron microscopy, diffraction methods,...
Mechanical properties, porosity, and microstructure of Ti6Al4V (ELI) material produced by Selective Laser Melting (SLM) under controlled oxygen content were analyzed. Fully martensitic α'structure with high dislocation density stacking faults was observed in both as-built stress relieved samples means XRD TEM. Tensile {101 ̅2} twinning identified TEM electron diffraction. Accommodation thermal stresses during manufacturing suggested as a possible reason for twinning. Computed tomography...
The aim of this study was to compare traditional strut-based lattices with minimal surface designs using morphological analysis and image-based simulations design files. While the two types have been studied widely, no direct comparison has ever done. Surprisingly, there are major differences in performance between generally, but do outperform slightly on angular load simulation. However, density range shown very thin walls, potentially making their accurate production more challenging, or...
Selective Laser Melting (SLM) presents a modern manufacturing process with an innovative technology which allows the production of full-density objects or fine-structured parts complex geometry and inner structures. Stability certification properties SLM are important tasks for all producers end-users. One drawbacks this is high residual stress in as-made objects. In study X-ray diffraction technique was used investigating induced into Ti6Al4V alloy samples. Principal stresses were estimated...
Biofunctionalization of Ti6Al4V alloy with metallic agents like Ag or Cu is a promising approach to add antibacterial properties and thus reduce the risk implant failure. This research investigates in-situ alloying Ti6Al4V(ELI) 3 at.% powders using Laser Powder Bed Fusion (L-PBF). The morphology geometrical characteristics single tracks layers were studied. powers 170 W 340 W, scanning speeds ranging from 0.4 1.4 m/s 0.8–2.8 implemented. Single track results showed balling effect humping at...
The modern medical industry successfully utilizes Laser Powder Bed Fusion (LPBF) to manufacture complex custom implants. Ti6Al4V is one of the most commonly used biocompatible alloys. In surgery practice, infection at bone-implant interface key reasons for implant failure. Therefore, advanced implants with biocompatibility and antibacterial properties are required. Modification Ti alloy Cu, which in small concentrations a proven non-toxic agent, an attractive way embedded functionality....
Global industrial adoption of laser-based powder bed fusion (LPBF) technology is still limited by the production speed, size build envelope, and therefore maximum part that can be produced. The cost LPBF driven down further improving rates without compromising structural integrity. A common approach rate improved increasing laser power beam diameter to instantly melt a large area powder, thus reducing scanning time for each layer. aim this study was investigate aspects upscaling processing...
Quality concerns in laser powder bed fusion (L-PBF) include porosity, residual stresses and deformations during processing. Single tracks are the fundamental building blocks L-PBF their shape geometry influence subsequent porosity 3D parts. The morphology of single depends primarily on process parameters. purpose this paper is to demonstrate an approach acoustic emission (AE) online monitoring for indirect defect analysis. This demonstrated through without powder, with layers. Gas-borne AE...