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Die castings

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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c9001641
EISBN: 978-1-62708-235-8
... Abstract Near-surface porosity in zinc die castings that were subsequently plated with copper, nickel, and bright chromium was causing blemishes in the plating. Identifying die casting turbulence and hot spots were keys to process modifications that subsequently allowed porosity to be greatly...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001120
EISBN: 978-1-62708-214-3
... Abstract A segment from a premium-quality H13 tool steel die for die casting of aluminum failed after only 700 shots. The segment was subjected to visual, macroscopic, hardness, and metallographic testing. The investigation revealed that failure occurred as a result of fatigue at an electrical...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c0048620
EISBN: 978-1-62708-225-9
.... Fasteners Intergranular corrosion Zinc-aluminum die casting alloy Stress-corrosion cracking The two nuts shown in Fig. 1(a) and (b) were used to secure the water-supply pipes to the threaded connections on hot-water and cold-water taps. The nut used on the cold-water tap ( Fig. 1a ) fractured...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.homegoods.c0090971
EISBN: 978-1-62708-222-8
... Abstract A die-cast zinc adapter used in a snowthrower failed catastrophically in a brittle overload manner. The component had a chemical composition similar to standard zinc alloy ZA-27 (UNS Z35840), although the iron content was much higher and the copper slightly lower. The mechanical...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c9001908
EISBN: 978-1-62708-235-8
... Abstract Cluster bomb tailcone assemblies each containing two aluminum die-cast components were rejected because of the poor surface condition of the die castings. Numerous heat checks were found on the surfaces of the tailcones and radiographic inspection revealed inclusions, gas holes...
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Published: 01 June 2019
Fig. 1 Brittle overload of a die-cast zinc snowthrower adapter. (a) Fracture surface of failed zinc casting contained many large brittle constituents. Energy-dispersive spectroscopy analysis revealed these were high-iron content inclusions. Scanning electron micrograph. 178×. (b More
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Published: 01 June 2019
Fig. 1 Die-cast zinc alloy nuts from a water tap. (a) Nut for the cold-water tap that failed by SCC. (b) Mating nut for the hot-water top that shows only isolated areas of corrosion. (c) Unetched section showing metal in the cold-water tap after corrosion testing. 600× More
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Published: 01 June 2019
Fig. 1 A classical “gas” pore in a zinc die casting. It has been opened to the surface of the part by the buffing operation performed prior to electroplating. More
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Published: 01 January 2002
Fig. 19 Brittle overload of a die-cast zinc snowthrower adapter ( example 8 ). (a) Fracture surface of failed zinc casting contained many large brittle constituents. Energy-dispersive spectroscopy analysis revealed these were high-iron content inclusions. Scanning electron micrograph. 178×. (b More
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Published: 01 January 2002
Fig. 23 Metallographic specimens from two aluminum die cast specimens. (a) View showing mount prepared from the fractured die castings. (b) Macrograph of the mount showing porosity (white spots) from polishing media and/or debris embedded in the pores. (c) Light micrograph showing the extent More
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Published: 01 January 2002
Fig. 24 SEM images from fracture surface of aluminum die casting. (a) 20.5×. (b) Shrinkage pores visible as dendritic structure. 164×. (c) View showing gas pore and intercellular fracture. 410×. (d) Mixture of gas (smooth, spherical) pores and shrinkage pores. 410× More
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Published: 01 January 2002
Fig. 28 Erosion damage and misaligned bore of the AISI H13 tool steel zinc die casting nozzle shown in Fig. 27 after longitudinal splitting. Actual size More
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Published: 30 August 2021
Fig. 11 Die-cast zinc alloy nuts from a water tap. (a) Nut for the cold-water tap that failed by stress-corrosion cracking. (b) Mating nut for the hot-water top that shows only isolated areas of corrosion. (c) Unetched section showing metal in the cold-water tap after corrosion testing More
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c9001222
EISBN: 978-1-62708-225-9
... Abstract A full lift disk, made of die cast brass, which served as a lifting aid in a safety valve, had cracked in service at a number of locations in the vicinity of the threaded hole. During microscopic examination, agglomeration of oxide inclusions were noted in the region of the cracks...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001284
EISBN: 978-1-62708-215-0
... Abstract Compound bow handle risers that had failed in service and during assembly along with an unassembled riser were submitted for analysis. The risers were die cast from magnesium-base alloy AM60A. Inspection of the failed risers and metallurgical investigations conducted on the stock riser...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003508
EISBN: 978-1-62708-180-1
... Abstract This article focuses on the general root causes of failure attributed to the casting process, casting material, and design with examples. The casting processes discussed include gravity die casting, pressure die casting, semisolid casting, squeeze casting, and centrifugal casting. Cast...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c9001199
EISBN: 978-1-62708-235-8
... Abstract Lakes in zinc die castings are areas encompassed by irregular lines or waves on flat or slightly contoured surfaces which are intended to look uniform. The laked areas have to be removed by polishing before the castings can be plated. This adds considerably to the overall cost...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c9001640
EISBN: 978-1-62708-235-8
... Abstract A new supplier for aluminum die castings was being evaluated, and the castings failed to meet the durability test requirements. Specifically, the fatigue life of the castings was low. Initial inspection of the fatigue fracture surfaces revealed large-scale porosity visible to the naked...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001123
EISBN: 978-1-62708-214-3
... Abstract Extensive cracking was found in a batch of die-cast ZAMAK 3 solenoid valve seats during commissioning of the system in which they were installed. Scanning electron microscopic and chemical analyses conducted on one of the failed valve seats showed that the composition of the alloy...
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Published: 01 January 2002
Fig. 22 (a) Cold shut voids (A, B) and flow lines (C, D) both caused by failure of the streams of molten metal to merge, at the cast surface (E) of an alloy 384-F die casting. 0.5% hydroflouric acid. 53× (b) Gate area (A) of an alloy 413-F die casting that has a cold shut void (B) and a region More