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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c0048120
EISBN: 978-1-62708-225-9
... Abstract The pawl spring which was part of a selector switch used in telephone equipment failed. The springs were blanked from 0.4 mm (0.014 in.) thick tempered 1095 steel and then nickel plated. Numerous pits around the rivet holes were revealed by microscopic examination of longitudinal...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c0048156
EISBN: 978-1-62708-235-8
... Abstract A 6150 flat spring was found to be failed. The face of the spring was revealed to be under tensile stress. The failure was concluded to have begun at the dark spot on the edge where roughness resulted from shearing during the blanking operation. Blanking Roghness Tensile stress...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001302
EISBN: 978-1-62708-215-0
... coalesced during service. Consideration of the manufacturing process suggested that the cracks were the result of overheating of the kingpin blanks prior to forging, which was exacerbated during forging by deformation heating in the highly-strained region. This view was supported by results of two types of...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.design.c0091538
EISBN: 978-1-62708-233-4
... Abstract Electrical contact-finger retainers blanked and formed from annealed copper alloy C65500 (high-silicon bronze A) failed prematurely by cracking while in service in switchgear aboard seagoing vessels. In this service they were sheltered from the weather but subject to indirect exposure...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001326
EISBN: 978-1-62708-215-0
... CaO was determined to be slag entrapment during the steel making process. It was recommended that the thermowell blanks be ultrasonically tested prior to machining and that the design be modified to make internal pressurization possible. Leakage Nonmetallic inclusions Nuclear reactor...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.usage.c9001663
EISBN: 978-1-62708-236-5
... Abstract Personnel responsible for laboratory protection at some plants are required to participate in exercises simulating a breach of security at the site. This document reports a metallurgical investigation of blank firing adapters (BFA), one of which exploded during such a training exercise...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.bldgs.c9001576
EISBN: 978-1-62708-219-8
... × 600 × 700 mm steel casing ( Fig. 1 ). The rated rotation speed is 1, 750 rpm. Blades are of the shape as shown in Fig. 2(a) and are blanked from coldrolled steel sheet. As shown in Fig. 3 , both ends of the blade are inserted into the slits provided on the disk or the ring. Fig. 1 Multi blade...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c0047165
EISBN: 978-1-62708-217-4
... been the result of any of the following factors, singly or in combination: The forging blank contained more than the optimum volume of metal in the flange area The forging blank contained less than the optimum volume of metal in the flange area, resulting in an underfill condition Forging...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0009222
EISBN: 978-1-62708-180-1
...-hardening steel. Fig. 2 Sharp corners in the two large countersunk holes of blanking die of manganese oil-hardening steel caused cracking. The excessive section change caused by aligning small and large holes emphasizes need for redesign. Fig. 3 Faint cracks in 102 by 95 mm (4 by 3.75 in...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c0048261
EISBN: 978-1-62708-225-9
... as a result of through hardening. Dimensions given in inches The ring gear, machined from a forged blank made of 4817 steel, had been gas carburized at 925 °C (1700 °F), cooled to 815 °C (1500 °F), press quenched in oil at 60 °C (140 °F), then tempered at 175 °C (350 °F) for 1 1 2 h to...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001077
EISBN: 978-1-62708-214-3
... same composition as the ingot being remelted. Because increased gear reliability in this type of application is necessary, further improvements in steelmaking were needed to reduce the levels ofharmful inclusions and improve homogeneity. A new specification for the gear blank material, which required...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.auto.c9001173
EISBN: 978-1-62708-218-1
... the blanking copper. Clearly, if this operation was carried out prior to the tempering, then the tempering operation would drive out the hydrogen thereby avoiding embrittlement problems no matter how quickly the ball joints are put into service after manufacture. The reason why previous samples hadn't...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001360
EISBN: 978-1-62708-215-0
... the ductility of the steel and increases its notch sensitivity. After the stainless steel strip is roller to extra full hard temper, the blades are blanked and the rivet holes are pierced. The blades are then lightly rolled to impart a slight curvature. Finally, the blades are stress relieved...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001752
EISBN: 978-1-62708-241-9
... crankshaft forging blanks were heat-treated and CVN impact-tested. No PDF features were found on these fracture surfaces. The ASTM 3.0–3.5 prior Austenite grain sizes of these billets were relatively large even for 121 mm (4¾-inch) × 121 mm (4¾-inch) round cornered-square billets. The hot-work steel mill...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001022
EISBN: 978-1-62708-214-3
... that it contained a large circumferential crack, fluorescent penetrant did not reveal the crack, because it had been effectively covered and blanked off with chromate paint. The center diaphragm had been machined out of this piece to expose the crack in greater detail, and it was sawed in half along...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c9001601
EISBN: 978-1-62708-235-8
..., theoretically, may represent the ultimate in reliability. 2 A metal blank or preform is formed over a rotating mandrel. The metal blank and the mandrel (which are locked together) rotate, and the forming roller follows the mandrel at a preset that has been programmed into a CNC flow forming machine. The...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001813
EISBN: 978-1-62708-180-1
... springs that broke and strip specimens of the raw material used to fabricate similar springs were examined to determine the cause of failure. The springs had been blanked from 0.4-mm (0.014-in.) thick tempered 1095 steel, then nickel plated. Fig. 4 Nickel plated 1095 steel pawl spring that...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001005
EISBN: 978-1-62708-215-0
... a characteristic steering arm fracture is shown in Fig. 2 and the failure location is also shown in Fig. 1 . Fig. 2 Fractured steering arm Forging slugs were blanks are prepared from annealed 4135 alloy bar material by shearing to the appropriate length. The process of...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.chem.c0048795
EISBN: 978-1-62708-220-4
... water was admitted to the vessel through a fitting in the cover plate until the vent that was within 3 mm ( 1 8 in.) of the inside surface at the top showed a full-bore discharge of water, at which time it was blanked off. The specified hydrostatic proof test called for a pressure of 48 MPa...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c9001241
EISBN: 978-1-62708-235-8
... not a rarity 2 , 3 , 4 . However the soft edge layer formated by oxygen or vapour decarburisation is not brittle or cracky. Fig. 8 Edge structure of a file blank, which remained too soft during hardening. Cross section, etched in nital. 100 × Quite different are procedure and effect of...