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nitriding

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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001676
EISBN: 978-1-62708-229-7
... case, nitriding and embrittlement occurred at temperatures as low as 300 to 400 deg C (determined from an examination of the oxidation of the Zircaloy-2 carrier rod on which the detectors were mounted). Recent results are described and discussed in terms of the oxidation and nitriding kinetics...
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Published: 30 August 2021
Fig. 23 (a) Broken tooth in chuck jaw after hardening and nitriding. (b) Micrograph showing initiation of crack in brittle white layer and propagation along nitride formed in austenite grain boundaries. Original magnification: 300× More
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.conag.c0092155
EISBN: 978-1-62708-221-1
... and the adjacent splined coupling sleeve. Specifications included that the gear and coupling be made from 4140 steel bar oil quenched and tempered to a hardness of 265 to 290 HB (equivalent to 27 to 31 HRC) and that the finish-machined parts be single-stage gas nitrided to produce a total case depth of 0.5 mm...
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Published: 01 June 2019
Fig. 3 Edge structure of a nitride plunger. Nitride layer peeled off because of decarburisation. Cross section, etched in picral. 100 × More
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.aero.c9001552
EISBN: 978-1-62708-217-4
... Abstract This report covers case histories of failures in fixed-wing light aeroplane and helicopter components. A crankshaft of AISI 4340 Ni-Cr-Mo alloy steel, heat treated and nitrided all over, failed in bending fatigue. The nitrided layer was ground too rapidly causing excessive heat...
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Published: 01 January 2002
Fig. 16 Average crater area vs. number of impacts for SN220M silicon nitride counterfaces impacted with a SN220M silicon nitride ball at varying humidities. Source: Ref 32 More
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Published: 01 January 2002
Fig. 17 Crater depth vs. number of impacts for GS-44 silicon nitride counterfaces of varying surface finish impacted with a NBD-200 silicon nitride ball. Source: Ref 33 More
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Published: 01 January 2002
Fig. 13 Gas-nitrided 4140 steel (27–31 HRC) drive-gear assembly in which gear teeth deformed because of faulty design and low core hardness. Details A and B show deformed areas on drive-gear teeth and mating internal splines. Dimensions given in inches More
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Published: 01 January 2002
Fig. 5 Subsurface fatigue origin in-service failure of 6.4 cm (2.5 in.) nitrided medium-carbon alloy steel crank pin. In contrast with the fracture surface shown in Fig. 4 , produced in the laboratory under continuous uniform loading, this surface exhibits beach marks. Courtesy of G.J. Fowler More
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Published: 01 January 2002
Fig. 1 SEM images of (a) IG fracture in ion-nitrided layer of ductile iron (ASTM 80-55-06), (b) transgranular fracture by cleavage in ductile iron (ASTM 80-55-06), and (c) ductile fracture with equiaxed dimples from microvoid coalescence around graphite nodules in a ductile iron (ASTM 65-40-10 More
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Published: 01 January 2002
Fig. 4 Both halves of a silicon nitride bar broken in bending. The tensile surfaces are in contact with each other. The fracture origin appears to be a hole (pore) in the bottom piece, but the origin is really an inclusion, as seen on the top piece. Optical microscope; reflected light; picture More
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Published: 01 January 2002
Fig. 5 Silicon nitride rod broken in uniaxial tension. Fracture origin is at the top of the image. Optical microscope; reflected light (direct illumination); picture width ∼5 mm More
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Published: 01 January 2002
Fig. 6 Silicon nitride rod broken in uniaxial tension. The same rod shown in Fig. 5 . Fracture origin is at the top of the image. Optical microscope; reflected light (oblique illumination); picture width ∼5 mm More
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Published: 01 January 2002
Fig. 15 Silicon nitride rod broken in uniaxial tension. Fracture origin is just to the left of the center of the rod. Optical microscope; reflected light; picture width ∼5 mm More
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Published: 01 January 2002
Fig. 16 Silicon nitride rod broken in bending. Fracture origin is at the top of the image. The horizontal line near the bottom of the image is the cantilever curl, typical of bending failure as the fracture approaches the compression side. Optical microscope; reflected light; picture width ∼5 More
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Published: 01 January 2002
Fig. 26 Fracture surface of silicon nitride with machining flaw as origin. Specimen was tilted in the SEM showing the machined surface at the top and the fracture surface at the bottom. Machining flaw is aligned with grooves on the original surface. SEM; picture width ∼1 mm. Source: Ref 7 More
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Published: 01 January 2002
Fig. 29 Silicon nitride (Si 3 N 4 ), plasma etched More
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Published: 01 January 2002
Fig. 12 Light micrograph of an ion-nitrided H13 tool steel specimen mounted in epoxy thermosetting resin (Epomet). The arrows point to a white-etching iron nitride layer at the surface that probably would not have been observed if the specimen was nickel plated for edge protection. Specimen More
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Published: 01 January 2002
Fig. 20 Light micrograph illustrating “comet tails” emanating from hard nitrides on the surface of a prepared specimen of H13 tool steel. The specimen is unetched and viewed with Nomarski DIC. More