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insufficient nitriding

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Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001847
EISBN: 978-1-62708-241-9
... underneath. This led to further wear and an increase in friction between the sleeve and bearing bush. Fatigue crack initiation occurred at the root fillet because of stress concentration and large frictional forces. Insufficient nitriding depth facilitated the propagation of fatigue cracks. bearing...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.machtools.c9001574
EISBN: 978-1-62708-223-5
... was a clear indication of high temperature exposure (due to insufficient cooling) during application. The most probable cause of failure was thermal fatigue. Grain boundaries Precipitation Punches WR-95 Chromium nitride coating Thermal fatigue fracture Background The CrN coated restrike...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.auto.c0047846
EISBN: 978-1-62708-218-1
... was removed in an effort to reduce cost and hence the shaft was subjected to increased vibration and shock loading. Insufficient fatigue limit of the shaft was revealed by fatigue testing of the shafts taken from stock in a rotating-beam machine. As a corrective measure, the fatigue limit of shafts...
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
..., the aluminum addition was reduced by one-half. Since then, there have been no additional rejects due to insufficient tensile and bend values. Castings Cracking (fracturing) Flanges Nonmetallic inclusions Tension tests Fe-0.22C GS C 25 (Other, general, or unspecified) fracture In a steel...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001269
EISBN: 978-1-62708-215-0
... homogenization of the carbides in the resultant hob, and lower sulfur content. Carbides Coatings Hobbing cutters Microstructural effects Sulfur Wear M2 UNS T11302 Brittle fracture Background A gear manufacturer reported recurring premature failures of titanium nitrided M2 tool steel gear...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.marine.c9001621
EISBN: 978-1-62708-227-3
...-range cyclic stresses (for example, bending in a shaft) are enough to cause continued fatigue crack growth. In a small number of cases, however, the long-range stresses in the body of the component are insufficient to cause continued propagation. 4 In those cases, the result is shallow, nonpropagating...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001846
EISBN: 978-1-62708-241-9
..., and journal surface. The excessive heat also softened the induction-hardened case on the journal surface, decreasing its fatigue strength. Fatigue crack initiation occurred at the root fillet of the groove because of stress concentration. rotary shaft bearing sleeve fracture insufficient lubrication...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.chem.c0091362
EISBN: 978-1-62708-220-4
...) supported the conclusion that failure of the nozzle weld was the result of intergranular corrosion caused by the pickup of interstitial elements and subsequent precipitation of chromium carbides and nitrides. Carbon pickup was believed to have been caused by inadequate joint cleaning prior to welding...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c9001254
EISBN: 978-1-62708-225-9
... with aluminum gave rise to the conclusion that the damage was caused by precipitation of aluminum nitride onto the primary and austenitic grain boundaries, subsequent determinations were made of aluminum and nitrogen content and the following values were found: They are arranged according to decreasing...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.steel.c9001255
EISBN: 978-1-62708-232-7
... off neck. In the centre of the fracture is a darkly tinted excentric flaw ( Fig. 2 ). Such internal cracks occur when a cast or forged work piece is heated up too quickly and insufficiently thoroughly for the anneal. The thermal expansion of the outer zone puts the central core under tensile stress...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003573
EISBN: 978-1-62708-180-1
...; the valve spring may have broken because corrosion had weakened it. The spring may have had insufficient strength and taken a set, allowing the valve to drop into the path of the piston, or the engine may have been raced beyond its revolutions per minute limit many times, causing coil clash and subsequent...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006797
EISBN: 978-1-62708-295-2
... head with the piston, but the failure analyst must go beyond this immediate cause in order to recommend proper corrective measures. The valve may have stuck open because of faulty lubrication; the valve spring may have broken because corrosion had weakened it. The spring may have had insufficient...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006791
EISBN: 978-1-62708-295-2
... and contacts operating in the mixed- and boundary-lubrication regimes, due to insufficient lubrication supply, inadequate viscosity, incorrect internal clearances, incorrect installation, or misalignment. Adhesive wear also can cause rapid and sometimes catastrophic failures ( Ref 2 ). This can occur in metal...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003555
EISBN: 978-1-62708-180-1
... scale-forming alloys appear to be much more resistant to carburization than the chromia scale-formers ( Ref 16 ). Nitridation Nitridation of alloys in ammonia environments is well known in ammonia and heat treating industries ( Ref 17 ). Nitridation attack by N 2 is known in the powder metal...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001814
EISBN: 978-1-62708-180-1
... nitric acid) pin, both the cam and the pin were heavily decarburized. (c) The chamfered cam holes were quite rough. 6.5×. The as-rolled surface decarburization had not been removed before heat treatment, and the surfaces were not cleaned-up after heat treatment. Failures of Nitrided Parts...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006818
EISBN: 978-1-62708-329-4
... and the pin were heavily decarburized. (c) The chamfered cam holes were quite rough. Original magnification: 6.5×. The as-rolled surface decarburization had not been removed before heat treatment, and the surfaces were not cleaned up after heat treatment. Failures of Nitrided Parts Although not used...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.conag.c9001471
EISBN: 978-1-62708-221-1
... in the region of the origin of the fracture. This latter region was also examined at high magnification with a view to detecting the presence of any embrittling constituents such as cementite films at grain boundaries or precipitated nitrides but none were seen. The chemical composition of the material...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001810
EISBN: 978-1-62708-180-1
...-load ratings are based on results of laboratory rolling-contact fatigue tests that have been conducted under conditions as near ideal as possible. Any departure from these reasonably ideal conditions, such as misalignment, vibration, shock loading, insufficient or inefficient lubrication, extremes...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003509
EISBN: 978-1-62708-180-1
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003507
EISBN: 978-1-62708-180-1
..., nitriding, carburizing, anodic hard coating Excessive case thickness, microcracks, embrittled material at stress raisers Machining Tool marks, grinding cracks Welding Weld-metal defects, hydrogen-induced cracking, inclusions, improper structure The primary purpose of this article...