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(Other, miscellaneous, or unspecified) failure

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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c0092103
EISBN: 978-1-62708-234-1
... started mainly at the mechanically stressed tooth flanks. In addition, oil vapors, humidity, and other degradative agents could also have contributed to the observed failure. No recommendations were made. Boilers Gear teeth Microporisty Polyoxymethylene (Other, miscellaneous, or unspecified...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c0092102
EISBN: 978-1-62708-234-1
... (frictional wear). No recommendations were made. Gears Lubrication Nylon (Other, miscellaneous, or unspecified) wear Figure 1 shows pitting on the tooth flank of a nylon oil-lubricated driving gear. The pitting produced numerous surface microcracks in association with large-scale fragmentation...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c0047387
EISBN: 978-1-62708-225-9
... composition Gear teeth Hardenability Sprockets Low-alloy steel (Other, miscellaneous, or unspecified) failure Induction-hardened teeth on a sprocket cast of low-alloy steel wore at an unacceptably high rate. A surface hardness of 50 to 51 HRC was determined; 55 HRC minimum had been specified...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.med.c9001573
EISBN: 978-1-62708-226-6
.... Arcing Pitting (wear) Surgical implants Wire Ti-6Al-4V Titanium nitride coating UNS R56406 Surface treatment related failures (Other, miscellaneous, or unspecified) wear Background The TiN coated back surgery wires were made of Ti6A14V. The reported failure was the presence of pits...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.matlhand.c0048035
EISBN: 978-1-62708-224-2
.... Thus, a 50% loss in tensile strength of the wires was caused by overheating which lead to failure of the rope. It was recommended that prolonged exposure of wire ropes to extreme conditions should be avoided. Cranes Slags Tensile strength Steel wire rope (Other, miscellaneous, or unspecified...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.chem.c0046953
EISBN: 978-1-62708-220-4
...), which exceeded normal operating temperatures, and carburization was not the principal cause of failure. No recommendations were made. Chemical reactors Melting Overheating Hastelloy X UNS N06002 (Other, miscellaneous, or unspecified) failure A portion of the wall of a reactor vessel used...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c0047935
EISBN: 978-1-62708-225-9
..., miscellaneous, or unspecified) wear (Other, miscellaneous, or unspecified) failure The electric motor in an office machine was producing intermittent noise. Ball bearings were suspected as the source of the noise and were removed from the motor and sent to the laboratory for examination. The bearings...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c9001900
EISBN: 978-1-62708-225-9
... the residue of partial melting was seen. Ball bearings Electric arcs Electric motors Grounding (electrical) Martensite Melting Scanning electron microscopy 52100 UNS G52986 (Other, miscellaneous, or unspecified) failure Incorrect grounding of an electric motor resulted in electric current...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c9001748
EISBN: 978-1-62708-225-9
..., miscellaneous, or unspecified) wear Made of AMS 6740, the shaft of Fig. 1 was nitrided to a depth of 0.009 to 0.013 in. It failed due to abnormal wear; spline failure of the power turbine gear caused an engine overspeed and disintegration. Excessive spline wear ( Fig. 2 ) resulted from a new coupling...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c0047939
EISBN: 978-1-62708-225-9
... 4620 UNS G46200 (Other, miscellaneous, or unspecified) failure The roller bearing shown in Fig. 1 was one of two that were mounted in an electric motor/gearbox assembly. Rough operation of the bearing was observed, and the unit was shut down. The bearing was removed and submitted...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.machtools.c0047307
EISBN: 978-1-62708-223-5
... hardenability for the section size involved. Breaker bars Castings Retained austenite Wear resistance Fe-2.75C-19.5Cr-1.1Mo (Other, miscellaneous, or unspecified) wear The nominal composition of this chromium alloy cast iron was Fe-2.75C-0.75Mn-0.5Si-0.5Ni-19.5Cr-1.1Mo. The measured hardness...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001015
EISBN: 978-1-62708-217-4
... Carburetors Clamps Helicopters Turbochargers Metal (Other, miscellaneous, or unspecified) failure Careful investigation of the flight log and accident reports indicated that a helicopter rapidly lost altitude and struck a tree, causing a fire and severe damage. In cases of this kind, it is common...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.auto.c9001624
EISBN: 978-1-62708-218-1
..., which led to melting of the wire. Chemical analysis Corrosion products Discoloration Electric Sensors Wire Copper (Other, miscellaneous, or unspecified) failure An electronic sensor coil failed continuity testing, indicating that a break was present in the polymercoated wire...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.steel.c9001623
EISBN: 978-1-62708-232-7
... wool (Other, miscellaneous, or unspecified) failure Several glass wool insulation sections from a heat-treat furnace showed visible discoloration. The insulation was originally white but exhibited a gray discoloration in some areas, as shown in Fig. 1 . As in the coin example, this discoloration...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001080
EISBN: 978-1-62708-214-3
... was responsible for the loosening of the nut. It was recommended that the locking mechanism be redesigned and changed in all existing turbines. Locking Nuts (fasteners) Turbine disks Turbine steel (Other, miscellaneous, or unspecified) failure Background A290 mm (10 in.) diam horizontal steam...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c9001626
EISBN: 978-1-62708-235-8
... into place and another type of tank material be considered. Chemical analysis Discoloration Pickling Tubes 17-4 PH UNS S17400 (Other, miscellaneous, or unspecified) failure A type 17-4PH stainless steel tube exhibited brown discoloration after a pickling operation. Although the discoloration...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.usage.c9001499
EISBN: 978-1-62708-236-5
... position under a reverberating load for an extended period of time. Loads (forces) Reflection Spur gears Vibration 8622 UNS G86220 (Other, miscellaneous, or unspecified) wear Three spur gears that had formed a straight-line train in a speed reducer were brought in for examination...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.steel.c0046956
EISBN: 978-1-62708-232-7
... boundaries Intermetallic phases Muffle furnaces Overheating Nickel-base high-temperature alloy (Other, miscellaneous, or unspecified) failure A brazing-furnace muffle 34 cm (13 1 4 in.) wide, 26 cm (10 3 8 in.) high, and 198 cm (78 in.) long, was fabricated from nickel-base high...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.usage.c9001572
EISBN: 978-1-62708-236-5
... in this case for the production acceptance tests. Coating removal Gouging Hydraulic assemblies Wobblers 52100E Titanium nitride coating UNS G52986 (Other, miscellaneous, or unspecified) failure Background Extensive slipper/wobbler failures had occurred in the integrated drive generators...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.matlhand.c9001209
EISBN: 978-1-62708-224-2
... operating stress if they had been welded satisfactorily and hardened correctly, and whether it made any sense to case harden highly stressed chains of this type. Chains Gas carburizing Wear Welded joints Steel chain Joining-related failures (Other, miscellaneous, or unspecified) wear Heat...