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powder processing

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Published: 30 August 2021
Fig. 8 Binder jetting and sintering process. (a) Image of a layer of powder in midprint in the binder jet process. (b) Depowdering after the curing step More
Image
Published: 30 August 2021
Fig. 19 Rough surface on a Ti-6Al-4V powder-bed-fusion-processed cylinder More
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006838
EISBN: 978-1-62708-329-4
... considerations, and quality assurance. The emphasis is on the design and metallurgical aspects for the two main types of metal AM processes: powder-bed fusion (PBF) and directed-energy deposition (DED). The article also describes the processes involved in binder jet sintering, provides information on the design...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001387
EISBN: 978-1-62708-215-0
... was severely corroded. An appreciable quantity of black powder was present at the bottom of the cell. Subsequent to these findings, many other cells were also dismantled because of disruption of the electrolysis process. The conditions leading to failure appeared to be the same in all the cells, although...
Image
Published: 30 August 2021
Fig. 1 Power ( P ) and velocity ( V ) in metal additive manufacturing processes by powder-bed fusion, wire-feed electron beam, and directed-energy (laser) deposition processes. Source: Ref 5 More
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Published: 30 August 2021
Fig. 5 Generic illustration of a metal additive manufacturing powder-bed fusion process. Source: Ref 3 More
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Published: 30 August 2021
Fig. 6 Generic illustration of a metal additive manufacturing (AM) powder-feed process. Source: Ref 3 More
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Published: 30 August 2021
Fig. 2 Effect of energy source on deposition rate and feature quality for the directed-energy deposition (DED) and powder-bed fusion (PBF) processes. Source: Ref 24 More
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c0045926
EISBN: 978-1-62708-235-8
... Abstract A batch of bimetal foil/epoxy laminates was rejected because of poor peel strength. The laminates were manufactured by sintering a nickel/phosphorus powder layer to a copper foil, cleaning, then chromate conversion coating the nickel-phosphorus surface, and laminating the nickel...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001784
EISBN: 978-1-62708-241-9
... of low carbon steel formed in a powder metallurgy process. A number of flaws were found including nonuniform wall thickness, poor geometric design with sharp corners as stress raisers, and incomplete sintering evidenced by unsintered particles. These were determined to be the primary cause of failure...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c9001165
EISBN: 978-1-62708-234-1
... corrosion resistance. Etching of the core structure showed a selective form of cast iron corrosion (spongiosis or graphitic corrosion) which lowered the strength of the cast iron enough that a knife could scrape off a black powder (10.85% C, 1.8% S, 1.45% P). Analysis showed that some of the “sulfate” found...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.bldgs.c9001548
EISBN: 978-1-62708-219-8
... testified on the process used to manufacture the aluminum-plywood panels. The testimony of defendant's metallurgist was of particular interest. His main arguments were: The analysis of the corrosion product was incorrect. The powder could not be aluminum; if it was, it would be subject to spontaneous...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c9001177
EISBN: 978-1-62708-234-1
... or the outside of the tube. However, indications of tightly closed cracks could be seen on the outer surface, which had been in contact with the chloride solution. A test for cracks by the magnetic powder technique was not possible with the austenitic material. By means of the colour penetration process, however...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.machtools.c0091853
EISBN: 978-1-62708-223-5
... Abstract A 230 mm (9 in.) diameter disk attrition mill was scheduled to grind 6.35 mm (0.25 in.) diameter quartz particles to a 0.075 mm (0.003 in.) diameter powder. Due to severe wear on the grinding plates, however, the unit was unable to complete the task of grinding the rock. The mill...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.chem.c9001713
EISBN: 978-1-62708-220-4
... Abstract On 21 April 1995, the contents of a large blender (6 cu m) reacted and caused an explosion that killed and injured a number of workers at a plant in Lodi, NJ. A mixture of sodium hydrosulfite and aluminum powder was being mixed at the time of the accident. This report focuses...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.steel.c9001598
EISBN: 978-1-62708-232-7
... separations facilities during the processing of target assemblies in the '70s. The highly radioactive liquid containing these isotopes, along with some plutonium, was consolidated in a stainless steel vessel in 1983. A process whereby the liquid containing these isotopes is incorporated into glass...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001843
EISBN: 978-1-62708-241-9
... Powder removed from affected area on connector Ag 0.01 0.01 0.01 Al 0.04 0.02 0.01 As <0.01 <0.01 <0.01 Bi a 0.09 0.06 <0.01 Ca 0.04 0.02 0.05 Cd <0.01 <0.01 <0.01 Co <0.01 <0.01 <0.01 Cu 10.85 7.78 0.04 Fe 0.36 0.04...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001342
EISBN: 978-1-62708-215-0
... Abstract A type 321 stainless steel downcomer expansion joint that handled process gases was found to be leaking approximately 2 to 3 weeks after installation. The expansion joint was the second such coupling placed in the plant after failure of the original bellows. The failed joint...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c9001674
EISBN: 978-1-62708-234-1
... that the preferential attack of the gold was due to HCN formed by decomposition of the explosive powder at high temperatures. Other associated reactions were also observed including the subsequent attack of the solder by the gold corrosion product and degradation of the plastic header. Bridgewires Detonators...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006826
EISBN: 978-1-62708-329-4
... an abrasive influence on the cutting tool; refinement of the primary proeutectic silicon by producing finely dispersed silicon grains through powder metallurgical processing can improve machinability ( Ref 22 ). These alloys must generally be machined with turning speed limitations, coolant, and carbide...