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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.homegoods.c0048674
EISBN: 978-1-62708-222-8
... to clamp onto the framework prior to springback. The heat treatment cycle of the fasteners consisted of austenitizing, quenching, tempering to obtain a tempered martensite microstructure, acid cleaning, zinc electroplating, coating with a clear dichromate and thereafter baking to remove the nascent...
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.power.c0046737
EISBN: 978-1-62708-229-7
... pictured in Fig. 1(a) broke apart in four places. In Fig. 1(b) , the separation second from the left and second from the right are complete breaks that occurred in service. The casting shown in Fig. 1(c) broke into three pieces in service. Fig. 1 Copper-zinc alloy cooling-tower hardware...
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.c9001215
EISBN: 978-1-62708-235-8
... Abstract The surface of a hook did not possess the smooth and shiny zinc bloom surface normally observed on hot galvanized steel parts but was matte and rough. Large cracks were observed in the zinc layer. The hook was made of silicon-killed alloy steel 41Cr4. A silicon content of 0.27...
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
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c0048620
EISBN: 978-1-62708-225-9
... impurities, such as lead, tin, or cadmium. This composition problem with zinc alloys was recognized many years ago, and particular attention has been directed toward ensuring that high-purity zinc is used. This corrective measure reportedly resulted in virtual elimination of this type of defect...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001383
EISBN: 978-1-62708-215-0
... Abstract Several case-hardened and zinc-plated carbon-manganese steel wheel studs fractured in a brittle manner after very limited service life. The fracture surfaces of both front and rear studs showed no sign of fatigue beach marks or deformation in the form of shear lips that would indicate...
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Published: 01 June 2019
Fig. 1 Zinc-electroplated 1060 steel fastener that failed by hydrogen embrittlement. The part was used to secure fabric to lawn-furniture framework. Dimensions given in inches More
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Published: 01 June 2019
Fig. 3(c) X-ray dot map for zinc at the aluminum/brass interface shown in Fig. 3(a) . More
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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 Copper-zinc alloy cooling-tower hardware that failed by SCC and dezincification. (a), (b), and (c) Photographs showing some of the castings that broke into two or more parts in service. 1 3 ×. In (b), separations other than those second from left and second from right were 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. 2 Microstructure of the zinc layer on a section taken perpendicular to the surface of the hook at a point at which the zinc layer was still adhering. The pure zinc layer has been consumed by excessive alloy formation. 200 × More
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Published: 01 June 2019
Fig. 3 Comparative micrograph showing a zinc layer of the usual thickness with normal structure (controlled galvanisation). The alloy layers are covered by a pure zinc layer with only isolated embedded alloy grains. 200 × 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. 4 Basal plane cracking in zinc at a subgrain (tilt) boundary. The basal plane is both a slip plane and a cleavage plane in this material. Source: Ref 19 , as cited in Ref 4 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. 49 Zinc-induced LME in 321 austenitic stainless steel. Etched in Vilella's reagent More
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Published: 01 January 2002
Fig. 50 SEM view of grains lost from 321 stainless steel by zinc-induced LME. Etched in Vilella's reagent More