ICALEO 2006 Paper #P539 (Fabrication of Fe-Based Bulk Metallic Glass Components Using Laser Additive Manufacturing)
Fabrication of Fe-Based Bulk Metallic Glass Components Using Laser Additive Manufacturing
Authors:
Shawn Kelly, ARL, The Penn State University; State College PA USA
Presented at ICALEO 2006
One of the current limitations in producing bulk metallic glass components of sufficient scale for structural application is the low critical casting thickness available with current amorphous alloy systems. Currently, iron-based glass forming alloys (Fe48Cr15Mo14Y2C15B6) can be cast into fully amorphous ingots approximately 12mm in diameter. With laser additive manufacturing, material and heat are added incrementally, theoretically leading to the fabrication of much larger amorphous structures than curren...$28.00
ICALEO 2006 Paper #P537 (Fibre Coupled Diode Laser Welding of Lead Alloy)
Fibre Coupled Diode Laser Welding of Lead Alloy
Authors:
Caroline Decombard, CEA de Valduc; Is-Sur-Tille France
OLIVIER AMIOT, CEA de Valduc; IS SUR TILLE France
Presented at ICALEO 2006
To reach the objective of reducing welding distortions, the Nd : YAG pulsed laser is mainly used in the laboratory. But for low melting point materials such as a lead alloy, a lot of molten pool instabilities can occur during laser/matter interaction. Actually, a porosity previously trapped in a solidified fusion zone can explode when it is partially melted by the next laser pulse. To avoid this phenomenon, a fiber (400 µm) coupled CW diode laser (500 W) is tested. To reduce equatorial shrinkage, ...$28.00
ICALEO 2006 Paper #P536 (Experimental Study of Magnesium and Aluminium Alloys Absorption and Keyhole Evolution during Laser Interaction Nd:YAG Laser Interaction)
Experimental Study of Magnesium and Aluminium Alloys Absorption and Keyhole Evolution during Laser Interaction Nd:YAG Laser Interaction
Authors:
Nicolas Pierron, University of Bourgogne; Le Creusot France
Pierre Sallamand, University of Bourgogne; France
Simone Matteï, University of Bourgogne; France
Presented at ICALEO 2006
In the laser processes such as laser welding and heat surface treatment, the absorption factor of laser Nd: YAG by metals plays an important role. Its evolution depends on many parameters such as temperature or surface conditions. In this paper, we present a method based on the measurement of reflected energy during the laser process, carried...$28.00
ICALEO 2006 Paper #P533 (On the Fly Cutting of Silicon Ribbon)
On the Fly Cutting of Silicon Ribbon
Authors:
Rob Janoch, Evergreen Solar, Inc.; Marlboro MA USA
Presented at ICALEO 2006
To reduce the cost of its String Ribbon © solar panels, Evergreen Solar has developed automated laser cutting equipment that enables cutting silicon ribbon into wafers as it emerges from the growth furnaces. The laser source was chosen based on its ability to produce microcrack-free cuts that result in high yield wafers. The system functional requirements are reviewed, and the design philosophy and design features are discussed. System implementation issues and its current status are presented.$28.00
ICALEO 2006 Paper #P532 (Laser Drilling of PET-backed Unfired Ceramic)
Laser Drilling of PET-backed Unfired Ceramic
Authors:
Leonard Migliore, Coherent Laser Group; Santa Clara CA USA
Presented at ICALEO 2006
Thin (50 to 100 micron) ceramic spacers for multi-layered electronic devices such as flash RAM require large numbers of small via holes drilled in them to perform their function. The preferred hole diameter is currently in the range of 100 microns but is expected to become smaller. These ceramics may be easily drilled prior to firing. So called "green" ceramic is comprised of fine refractory particles in an organic binder. The binder, which burns off during firing, gives the material the consistency of a weak flexible tape. Sheets of green ceramic, consequent...$28.00
ICALEO 2006 Paper #P530 (Drilling Strategies for Metals with Pulsed YAG Lasers)
Drilling Strategies for Metals with Pulsed YAG Lasers
Authors:
Rene Liebers, LASAG AG; 3602 Thun IL Switzerland
Lena Trippe, Lehrstuhl für Lasertechnik; Germany
Ulrich Dürr, LASAG AG; Switzerland
Wolfgang Schultz, Fraunhofer ILT; Germany
Presented at ICALEO 2006
Laser drilling of metals is widely used to manufacture turbine components (Ni-alloys), microfilters and combustion nozzles (Fe-alloys) at high productivity. However, there are gaps in understanding the productivity of drilling and its relation to product quality. In particular, taper and microstructure suffer from recast and crack formation. Advances in fundamental physical modelling and di...$28.00
ICALEO 2006 Paper #P529 (The Effects of Laser Forming on Superelastic NiTi Shape Memory Alloys)
The Effects of Laser Forming on Superelastic NiTi Shape Memory Alloys
Authors:
Andrew J. Birnbaum, Columbia University; New York NY USA
Y. Lawrence Yao, Columbia University; New York NY USA
Presented at ICALEO 2006
This work focuses on application of the laser forming process to NiTi shape memory alloys. While all NiTi shape memory alloys exhibit both superlasticity and the shape memory effect, this study is restricted to a temperature range over which only the superelastic effect will be active. Specifically, this work addresses laser forming induced macroscopic bending deformations, post process residual stress distributions and changes in microstructure. Like traditional ferr...$28.00
ICALEO 2006 Paper #P527 (The Transition from Qualitative Plexiglas Burn-Ins to Quantitative Electronic Data Acquisition for Beam Diagnostics (Evaluation, Benchmark))
The Transition from Qualitative Plexiglas Burn-Ins to Quantitative Electronic Data Acquisition for Beam Diagnostics (Evaluation, Benchmark)
Authors:
Otto Märten, PRIMES GmbH; Pfungstadt Germany
Volker Brandl, PRIMES GmbH; Pfungstadt Germany
Presented at ICALEO 2006
Plexiglas burn-ins have been the standard for raw beam analysis of CO2-lasers for a long time. Different beam diameter definitions have been established based on the mechanical dimensions of these Plexiglas burn-ins, usually derived from the diameter at a certain threshold (e. g. full width at 50% or 30% maximum height). These definitions are widely used, especially for service applications, but also in science and engi...$28.00
ICALEO 2006 Paper #P526 (Numerical Modeling for Embedding of Fiber Bragg Grating Sensors within Metallic Structures Using Laser Solid Freeform Fabrication)
Numerical Modeling for Embedding of Fiber Bragg Grating Sensors within Metallic Structures Using Laser Solid Freeform Fabrication
Authors:
Ehsan Toyserkani, University of Waterloo; Waterloo ON Canada
Hamidreza Alemohammad, University of Waterloo; Waterloo ON Canada
Presented at ICALEO 2006
This paper describes a numerical model for embedding of fiber Bragg grating (FBG) sensors in metallic structures using laser solid freeform fabrication technique. For the characterization of the embedding process, a finite element model is developed for both static and dynamic conditions. The modeling consists of two steps: 1.Development of an engineered protective layer around the fiber optic to...$28.00
ICALEO 2006 Paper #P525 (Application of SLS Technique in Manufacturing Alkali-Corrosion Resisting Valve Pieces)
Application of SLS Technique in Manufacturing Alkali-Corrosion Resisting Valve Pieces
Authors:
Pengcheng Wang, School of Materials Science and Engineering, Inner Mongolia University of Technology; hohhot Peoples Republic of China
Fushun Zhu, IMUT; Hohhot Peoples Republic of China
Junjie Xiao, IMUT; Hohhot Peoples Republic of China
Xiaocheng Li, IMUT; Hohhot Peoples Republic of China
Presented at ICALEO 2006
This paper describes the new process that combine selective laser sintering(SLS) technology with direct shell production casting (DSPC). In this method, a casting model is reversed into its foundry shell mould in the software environment, such as Pro...$28.00
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