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casting pores

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Image
Published: 01 December 2019
Fig. 7 Pores around the hole due to the casting process More
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001760
EISBN: 978-1-62708-241-9
... bolts during the engine disassembly Fig. 5 The flatness of the cylinder head surface (where connected to engine block) Fig. 6 The surfaces after opening cracked zone Fig. 7 Pores around the hole due to the casting process Fig. 1 Cracked zone on the cylinder head...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001781
EISBN: 978-1-62708-241-9
... casting pores through 20% of the hosel thickness. Mechanical properties were determined from characterization results, then used to construct a finite element model to analyze material performance under failure conditions. In addition, a full scale structural test was conducted to determine failure...
Image
Published: 30 August 2021
of the crack-initiation sites below the surface (lower part of image) coinciding with a casting pore (arrow). (d) Finite-element stress map showing location of maximum stress coinciding with crack initiation More
Image
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
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c9001202
EISBN: 978-1-62708-234-1
... in Fig. 5 . On the left marked ← cavitation pits can be seen on the internal surface of the front wall and on the right marked ↘ casting pores in the region corresponding to Fig. 4 . It should be mentioned here that even when the specimens were cut carefully with a water cooled cutting wheel the stem...
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
... metallographic evaluations that showed blemishes at the same locations as the underlying pores. In addition, a theoretical foundation can be used to demonstrate how the pores can cause blemishes on the plated surfaces. The plating process requires that the castings be immersed in several liquid baths...
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
... assembly revealed tensile properties well below the allowable design values. Radiology and CT evaluations revealed no casting defects. Optical microscopy revealed porosity uniformly distributed throughout the casting on the order of 0.1 mm pore diam. Scanning electron microscopy revealed elongated pores...
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
.... Because the die cast brass was alloyed with aluminum, these inclusions consisted predominantly of aluminum oxide. The tolerable limit in pores and oxide inclusions was greatly exceeded in the lift disk under examination. Above all, the numerous oxide skins disrupted the cohesion of the microstructure...
Image
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
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001084
EISBN: 978-1-62708-214-3
.... Fig. 2 SEM micrographs of surface defects on sample SEM 1. (a) Intersection of pores with surface and dendritic structure.(b)Higher-magnification view of dendrites. Another casting defect, shown as a cavity in Fig. 3(a) , also has a dendritic appearance. This defect is seen in Fig. 1...
Image
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
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.med.c0048423
EISBN: 978-1-62708-226-6
... of the distal fragment. Gas pores are apparent in the grain and at the grain boundaries were revealed by a transverse section. Fine parallel line structures that run diagonally through the fractograph may be slip traces were revealed by scanning electron microscopy. One of the cracks was revealed to have...
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
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.chem.c9001675
EISBN: 978-1-62708-220-4
... diameter, flexible tubes. The upper end of the riser is welded to a large tube which combines the product from nine risers and transfers it to the next stage of the process. Fig. 1 Schematic arrangement of the tubing showing where cracks originated in service. The riser is centrifugally cast...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001029
EISBN: 978-1-62708-214-3
... of silicon particles that formed in the interdendritic aluminum-silicon eutectic, typical of A356-T61 castings. Normal amounts of shrinkage pores were also present. In summary, no microstructural anomalies were found that could be related to the observed failure. Discussion Because hot tear fractures...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c9001533
EISBN: 978-1-62708-225-9
... Abstract An investigation of wear and failure of babbitt bushes was completed in this study. The results showed that wear at dry sliding of babbitt obtained by plasma spraying was less than that of babbitt in the as-cast state and after a deformation heat treatment. The failure of babbitt...
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
... a casting practice that eliminates such discontinuities at minimum cost. Porosity Porosity is a common defect (imperfection) in castings and takes many forms. Pores may be connected to the surface, where they can be detected by dye-penetrant techniques, or they may be wholly internal, where...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.matlhand.c0089676
EISBN: 978-1-62708-224-2
... Abstract Chain link, a part of a mechanism for transferring hot or cold steel blooms into and out of a reheating furnace, broke after approximately four months of service. The link was cast from 2% Cr austenitic manganese steel and was subjected to repeated heating to temperatures of 455 to 595...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c9001615
EISBN: 978-1-62708-235-8
..., the second stage of the forging revealed a large central defect. In the third or final stage the defect was in the form of a lateral crack near the transition of shank and disc. Several pits/pores were observed in the first stage preform of the forging after the sectioned surface was finished with emery...