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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c9001251
EISBN: 978-1-62708-235-8
... Abstract In a steel foundry, tensile and bend specimens of castings made in a 2-ton basic arc furnace showed, at irregular intervals, regions with coarse-grained fractures where the specimens broke prematurely, so that the specified strength and toughness values could not be reached. Several...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.rail.c9001665
EISBN: 978-1-62708-231-0
... that some copper was accidentally left in the mold when the casting was poured. Liquid copper, carrying with it oxygen in solution, penetrated the austenite grain boundaries as the steel cooled. The oxygen reacted with the steel producing a network of scale outlining the austenite grain structure. When...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.steel.c0089617
EISBN: 978-1-62708-232-7
... Abstract A forged 4130 steel cylindrical permanent mold, used for centrifugal casting of gray- and ductile-iron pipe, was examined after pulling of the pipe became increasingly difficult. In operation, the mold rotated at a predetermined speed in a centrifugal casting machine while the molten...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c9001522
EISBN: 978-1-62708-235-8
... Abstract In the EMD-2 Joint Directed Attack Munition (JDAM), the A357 aluminum alloy housing had been redesigned and cast via permanent mold casting, but did not meet the design strength requirements of the previous design. Mechanical tests on thick and thin sections of the forward housing...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c0047441
EISBN: 978-1-62708-234-1
... Abstract A fan support casting failed unexpectedly while running at 1800 rpm in pulp at 65 deg C (150 deg F). The leading edge of the blade exhibited deep spongy holes leading to reduced section and finally to fracture of the part when the remaining section size was insufficient to support...
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
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001074
EISBN: 978-1-62708-214-3
... Fig. 1 Yoke body fracture location (arrow). Fig. 2 Negative print of the radiograph of a machined casting (location of shrinkage cavity designated by arrow). Fig. 3 Massive shrinkage cavity on fracture surface. SEM, 27.2×. Fig. 4 Interface between shrinkage cavity...
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
... with secondary carbides. Nital etched. 310×. 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...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001133
EISBN: 978-1-62708-214-3
... (max) Manganes 0.32 1.0 (max) Cobalt … bal Fig. 1 Porous, coated knee implant, as received. Insufficient bonding occurred at the tip of the patella flange. Fig. 2 Typical femoral knee casting, showing the patel a flange region. Fig. 3 Metallographic section...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.med.c0089543
EISBN: 978-1-62708-226-6
.... Bone screws Casting defects Screws Surgical implants ASTM F75 Casting-related failures Portions of the threads of the screw shown in Fig. 1(a) had broken off, and other threads had cracked. The screw was made from a cast Co-Cr-Mo alloy. A longitudinal section through the screw revealed gas...
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Published: 01 June 2019
Fig. 2 Microstructures of the fractured door-closer cylinder casting. (a) Casting showing types B and D graphite. Fracture is at top, and outside surface is at left. As-polished. 100x. (b) Pearlite/ferrite microstructure of casting containing about 70% ferrite. Etched with nital. 400x. (c More
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006831
EISBN: 978-1-62708-329-4
... Abstract The information provided in this article is intended for those individuals who want to determine why a casting component failed to perform its intended purpose. It is also intended to provide insights for potential casting applications so that the likelihood of failure to perform...
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Published: 01 June 2019
Fig. 1 Microstructure of casting, etch: Picral, 500× More
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Published: 01 June 2019
Fig. 2 Microstructures of the cracked door-closer cylinder casting. (a) Fracture region showing predominantly type D graphite. This region was along the partling line of the thin section. 100x. (b) A primary type D graphite structure adjacent to the gas defect (bottom). The outside More
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Published: 01 June 2019
Fig. 4 Microstructures of the cracked casting. (a) Ferrite/pearlite matrix is representative of the cracked casting. 100x. (b) Structure of cracked casting adjacent to the gas defect. The white constituents in the dark pearlite zone are carbides. White regions in the fine type D graphite More
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Published: 01 June 2019
Fig. 3 Structure of slide, etch: Picral. 200×. At edge with casting skin, horizontal section, Point C. More
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Published: 01 June 2019
Fig. 1 Narrow-headed arrows show porosity internal to the casting. The wide-head arrows show the ratchet marks—an indication here that the crack has started in multiple locations along the inside surface. More
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Published: 01 June 2019
Fig. 1 Severe intergranular corrosion in a CN-7M casting. The exact function and service conditions of the part (probably a pump outlet) are unknown. Intergranular corrosion was so severe that the part could be twisted and stretched; thus, it was termed the rubber casting. See also Fig. 2 More
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Published: 01 June 2019
Fig. 2 Close-up view of the casting shown in Fig. 1 . Individual grains stand out, and many fall free when the part is moved. See also Fig. 3 . 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