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4140

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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.matlhand.c0046388
EISBN: 978-1-62708-224-2
... Abstract The bolt in a bolt and thimble assembly used to connect a wire rope to a crane hanger bracket was worn excessively. Two worn bolts, one new bolt, and a new thimble were examined. Specifications required the bolts to be made of 4140 steel heat treated to a hardness of 277 to 321 HRB...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c0047830
EISBN: 978-1-62708-235-8
... Abstract Textile-machine crankshafts forged from 4140 steel fractured transversely on one cheek during one to three years of service. The cause of failure for two forgings (one complete fractured forging and second a section that contained the shorter shaft fracture cheek) was determined...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.conag.c0048082
EISBN: 978-1-62708-221-1
... Abstract The horizontal cross-travel shaft on a derrick failed after two years of service. The shaft was required to be made of 4140 steel quenched to a hardness of 302 to 352 HRB. The shaft was found to have fractured approximately 13 mm from the change in section between the splined end...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c0047105
EISBN: 978-1-62708-225-9
... forcefully in the direction of the load, causing substantial damage to other machinery components in the vicinity. The failed component, which was 43 cm (17 in.) in diameter, was machined from 4140 plate and heat treated to 34 to 36 HRC. Analysis (visual inspection, composite micrographs, scanning electron...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c0046057
EISBN: 978-1-62708-225-9
... Abstract After less than 30 days in service, several cadmium-plated retaining rings, made of 4140 steel tubing and heat treated to 36 to 40 HRC, broke during operation that included holding components of a segmented fitting in place under a constant load. Photographic and 100x nital-etched...
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Published: 01 January 2002
Fig. 35 Micrograph of AISI 4140 steel as quenched and tempered. The microstructure is tempered martensite with evidence of decarburization and high-temperature oxidation on the surface of the crack profile. 50×; 2% nital etch. Source: Ref 27 More
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Published: 01 January 2002
Fig. 36 Micrograph of AISI 4140 steel as quenched and tempered. The microstructure is tempered martensite with intergranular quench cracking along the prior austenite grain boundaries. 100×; 2% nital etch. Source: Ref 27 More
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Published: 01 January 2002
Fig. 42 Micrograph of AISI 4140 steel as quenched and tempered. The microstructure is tempered martensite with quench cracking in the area of dimensional change. 91×; 2% nital etch. Source: Ref 27 More
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Published: 01 January 2002
Fig. 44 Micrograph of AISI 4140 steel as quenched and tempered. The microstructure is tempered martensite with quench cracking initiating from a machine groove. 100×; 2% nital etch. Source: Ref 27 More
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Published: 01 January 2002
Fig. 71 Micrograph of AISI 4140 steel as quenched and tempered; microstructure is tempered martensite, where cracking is promoted by alloy depletion. 91×; 2% nital etch. Source: Ref 27 More
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Published: 01 January 2002
Fig. 86 Micrograph of AISI 4140 steel as quenched and tempered, showing bands of tempered martensite and tempered martensite/bainite. 50×; 2% nital etch. Source: Ref 27 More
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Published: 01 January 2002
Fig. 87 Micrograph of AISI 4140 steel as quenched and tempered. Microstructure shows banded martensite and tempered martensite/bainite. Subsurface cracking is illustrated. 100×; 2% nital etch. Source: Ref 27 More
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Published: 01 January 2002
Fig. 15 “Tire tracks” on a fatigue fracture surface of a 4140 steel quenched and tempered at 700 °C (1292 °F) More
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Published: 01 January 2002
Fig. 10 4140 steel slat track from a military aircraft wing. The track bent because one end did not become fully austenitic during heat treatment, producing a low-strength structure of ferrite and tempered martensite. 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. 17 Forged 4140 steel textile-machine crankshaft that fractured in fatigue originating at machining marks and forging defects. (a) Configuration and dimensions (given in inches). (b) Fracture surface. (c) Hot trim marks. (d) Snag grinding marks. (e) Hot folds. (f) Section through a hot More
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Published: 01 January 2002
Fig. 29 Large-diameter 4140 steel radar-antenna bearing that failed because of improper heat treatment of outer-ring raceway. (a) Configuration and dimensions (given in inches). (b) Fractograph showing typical damage on outer-ring raceway. (c) Micrograph of section through metal in outer ring More
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Published: 01 January 2002
Fig. 17 4140 steel cross-travel shaft that failed in service. (a) Broken end of the shaft from a derrick showing the star-type fracture that results from reversed torsional loading. (b) Transverse section through the spline showing cracks initiated at sharp corners at the roots of the spline More
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Published: 01 January 2002
Fig. 16 Cadmium-plated 4140 steel nuts from a military jet engine that failed by LME. (a) Fragmented and cracked nuts. (b) Typical fracture surface. (c) Electron fractograph showing brittle intergranular fracture More
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Published: 01 January 2002
Fig. 3 Service failure of a low-alloy steel nut by LMIE. Cadmium-plated, 4140 low-alloy steel (44 HRC) nuts were inadvertently used on bolts for clamps used to join ducts that carried hot (500 °C, or 930 °F) air from the compressor of a military jet engine. (a) The nuts were fragmented More