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laser directed-energy deposition

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Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2015
DOI: 10.31399/asm.tb.spsp2.t54410551
EISBN: 978-1-62708-265-5
... limitless because of the ability to deposit almost any material by vapor deposition and the ultrahigh heating and cooling rates of thin surface layers heated by electron and laser beams. This chapter describes some of the newer processes used to apply thermochemical modifications, coatings, and high-energy...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2009
DOI: 10.31399/asm.tb.bcp.t52230361
EISBN: 978-1-62708-298-3
... heating, laser heating, and radiation). The depositing species (clusters of atoms or molecules) have relatively low energies (less than five electron volts, or eV). Relatively high deposition rates are attainable. The process is generally performed in vacuum, typically at 10 –3 to 10 –4 Pa (10 –5 to 10...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 1998
DOI: 10.31399/asm.tb.ts5.t65900305
EISBN: 978-1-62708-358-4
..., directed sources of heat and are used for many types of surface modification. As shown in Fig. 16-15 , depending on power input, high-energy laser beams can be used for a variety of applications, including cutting, welding, surface melting and alloying, and localized surface hardening ( Ref 3 , 55 - 58...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2011
DOI: 10.31399/asm.tb.jub.t53290079
EISBN: 978-1-62708-306-5
... joining applications, as a unique source of thermal energy, precisely controllable in intensity and position. For welding, the laser beam must be focused to a small spot size to produce a high power density. This controlled power density melts the metal and, in the case of deep-penetration welds...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.tb.msisep.t59220085
EISBN: 978-1-62708-259-4
.... Two methods are widely used to analyze the energy spectrum of the x-rays. The first one is a method called wavelength dispersion spectroscopy (WDS), in which the spectrum of emitted x-rays is directed toward a crystal of known plane spacing. The angle at which diffraction occurs depends...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 1997
DOI: 10.31399/asm.tb.wip.t65930197
EISBN: 978-1-62708-359-1
... cooling until the crater has solidified. In some hot-cracking situations, a reduction in travel speed can alter the solidification directions in the weld deposit and thus reduce susceptibility to hot cracking. In wrought heat-treatable aluminum alloys, the relation between working and weld direction...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2016
DOI: 10.31399/asm.tb.hpcspa.t54460173
EISBN: 978-1-62708-285-3
... produced by MA do not usually meet the morphology and flowability targets for spraying deposition processes. Powders produced by high-energy ball milling are usually angular in shape because of flattening during high-energy impacts between particles and mill balls. The cold gas spraying process requires...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2001
DOI: 10.31399/asm.tb.secwr.t68350231
EISBN: 978-1-62708-315-7
... nitriding. A method of surface hardening in which nitrogen ions are diffused into a workpiece in a vacuum through the use of high-voltage electrical energy. Synonymous with plasma nitriding or glow-dis- charge nitriding. ion plating. A generic term applied to atomistic film-deposition processes in which...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2001
DOI: 10.31399/asm.tb.secwr.9781627083157
EISBN: 978-1-62708-315-7
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2012
DOI: 10.31399/asm.tb.smfpa.t53500317
EISBN: 978-1-62708-317-1
.... Common surface-hardening methods used in stamping tools Table 16.3 Common surface-hardening methods used in stamping tools Diffusion techniques Applied energy techniques Coating/surface modifications Nitriding Thermal diffusion Flame hardening Induction hardening Laser...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 30 September 2023
DOI: 10.31399/asm.tb.stmflw.t59390039
EISBN: 978-1-62708-459-8
... smooth surfaces, and this in itself may sufficiently reduce the thickness of protective lubricants at some locations to allow junction formation. Experiments have shown that shearing takes place in a direction slightly inclined to the surface ( Fig. 4.1 ), creating wedges or prows of workpiece material...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2015
DOI: 10.31399/asm.tb.cpi2.t55030165
EISBN: 978-1-62708-282-2
..., thermal spraying, chemical vapor deposition, or surface modification using directed energy (laser or ion) beams. Inhibitors Corrosion inhibitors are substances that slow or prevent corrosion when added to an environment in which a metal usually corrodes. The effectiveness of corrosion inhibitors...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2019
DOI: 10.31399/asm.tb.mfadr7.t91110351
EISBN: 978-1-62708-247-1
... because of limited direct line of sight access to the silicon due to interposers or through silicon via (TSV) stacked die. This has led to exploration work on package level editing of the signals, with gallium-based FIB tools [11] , laser systems [12] or improved plasma source FIB tools [13...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 1997
DOI: 10.31399/asm.tb.wip.t65930003
EISBN: 978-1-62708-359-1
... the centerline, resulting in a finer fusion zone grain structure. Such observations are typical in high energy beam welds or arc welds made at low welding speeds. For a tear drop shaped puddle, there is almost an invariant direction of maximum thermal gradient at all points on the pool edge from the fusion...
Series: ASM Technical Books
Publisher: ASM International
Published: 30 September 2023
DOI: 10.31399/asm.tb.stmflw.9781627084598
EISBN: 978-1-62708-459-8
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 February 2022
DOI: 10.31399/asm.tb.mbheaktmse.t56030001
EISBN: 978-1-62708-418-5
.... Another method of fabricating bulk HEAs is by additive manufacturing (AM) ( Ref 78 , 79 ). Recently, scientists fabricated HEAs by selective laser melting ( Ref 80 ), directed energy deposition ( Ref 81 ), electron beam melting ( Ref 82 ), binder jetting ( Ref 83 ), three-dimensional (3D) ink-extrusion...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2019
DOI: 10.31399/asm.tb.mfadr7.t91110524
EISBN: 978-1-62708-247-1
... structure is determined by the masks used during wafer processing. The first step in making a laser is epitaxial growth, usually in a high-temperature reactor with metal-organic chemical vapor deposition (MOCVD) depositing a few microns of material on a GaAs or InP substrate. In this step, cladding...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2019
DOI: 10.31399/asm.tb.mfadr7.t91110335
EISBN: 978-1-62708-247-1
... ( 2010 ): C6F15 – C6F21 . 10.1116/1.3511509 [8] Shorubalko Ivan , Pillatsch Lex , and Utke Ivo . “ Direct–Write Milling and Deposition with Noble Gases. ” In Helium Ion Microscopy , 355 – 393 . Springer , 2016 . 10.1007/978-3-319-41990-9_15 [9] Castaldo Vincenzo...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2019
DOI: 10.31399/asm.tb.mfadr7.t91110379
EISBN: 978-1-62708-247-1
... removal. Fig. 6 . Immediately change to slurry polishing once 2x metal pitch layer is exposed. Die level Laser Deprocessing Technique (LDT) This technique is using a laser marking system that the laser has a wavelength of 532nm. The laser pulse has a controllable energy from 0 to 0.5mJ and fixed...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2013
DOI: 10.31399/asm.tb.ahsssta.t53700177
EISBN: 978-1-62708-279-2
... Abstract This chapter describes the nature of the problems arising from using advanced high-strength steels (AHSS) and discusses potential remedies to minimize the adverse effects that may limit the adoption of AHSS in the automotive industry. The discussion provides information on press energy...