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Case-hardened fasteners

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Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001383
EISBN: 978-1-62708-215-0
... exacerbated the situation by providing a strong local corrosion cell in the form of a sacrificial anode region adjacent to the cracked thread. The enhanced generation of hydrogen in a corrosive environment subsequently lead to HASC of the wheel studs. Case-hardened fasteners Fasteners Stress-corrosion...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001208
EISBN: 978-1-62708-229-7
... by two bolts. It is not clear what sense the welding has made under these circumstances. In any case, it certainly was unsuitable as a means for rounding off the cross sectional transition as was proved by the fracture caused by it. Fig. 6 Superheated steam push rod with unbroken spindle. 1...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c9001260
EISBN: 978-1-62708-235-8
... melting clinkers from scale and furnace lining filling up the crevice of the original defect. Decarburizing Ingots Nonmetallic inclusions Rolling Fe-0.4C-0.73Mn-1.15Cr-0.28Mo (Other, general, or unspecified) processing-related failures Case History One percent Chromium-Molybdenum steel...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.design.c9001582
EISBN: 978-1-62708-233-4
... thread (the last threat to engage in this case) assumes a higher than average load while the remaining threads carry successively lower loads. Analytical studies 2 have shown that the load on the first thread can be over twice the average load for all threads. The earlier, pre-value engineering design...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001030
EISBN: 978-1-62708-214-3
.... Third, the presence of molybdenum disulfide and moisture resulted in weak sulfurous acid, which further accelerated SCC by nature of its corrosive action. The purpose of specifying interference-fit fasteners as a structural enhancement in this case was to increase fatigue life by reducing the stress...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006805
EISBN: 978-1-62708-329-4
... As is the case with almost any failure analysis, a first step is to consider whether the component(s) at issue meet the design and manufacturing specifications. In the case of fasteners, this is especially important, because historically there have been instances of counterfeit fasteners. In the United States...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001812
EISBN: 978-1-62708-180-1
... more noble metals such as copper alloys. In this case, galvanic corrosion and the size effect are involved, as described below. For a structure to be well designed, the anode or corroding-metal area should be large relative to the cathode or protected metal in order to ensure reasonable anode life...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001097
EISBN: 978-1-62708-214-3
... Handbook of Case Histories in Failure Analysis, Volume 1 Copyright © 1992 ASM International® K.A. Esaklul, editor All rights reserved DOI: 10.31399/asm.fach.v01.c9001097 www.asminternational.org ...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001844
EISBN: 978-1-62708-241-9
... Park , 2000 ) 11. Krauss G. , The microstructure and fracture of a carburized steel . Metall. Trans. 9A , 1527 – 1535 ( 1978 ) 10.1007/BF02661935 12. Streng H. , Razim C. , Grosh J. , Influence of hydrogen and tempering on the toughness of case-hardened...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.homegoods.c0048674
EISBN: 978-1-62708-222-8
... steel. They were barrel finished to remove burrs and hardened and tempered to 45 to 52 HRC. The fasteners were electroplated with zinc and coated with clear zinc dichromate. During attachment of the fabric to the furniture, approximately 30% of the fasteners cracked and fractured as they were...
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
...-hardenability steels ( Ref 8 ). Another example of the complexity of the effect of manufacturing on residual stresses is shot peening. If peening intensity is too high, large tensile stresses can occur below the surface, which can cause problems in bending and torsion. Faulty Case Hardening Carburizing...
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
... of the complexity of the effect of manufacturing on residual stresses is shot peening. If peening intensity is too high, large tensile stresses can occur below the surface, which can cause problems in bending and torsion. Faulty Case Hardening Carburizing, which both increases the surface hardness of a part...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001099
EISBN: 978-1-62708-214-3
... the inclusions and fractures. Etching revealed a uniform fine-grain microstructure of tempered martensite. Textural directionality in and around the cap region indicated that the cap had been formed by hot upsetting or some similar forging operation during manufacture. There was no evidence of case hardening...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006816
EISBN: 978-1-62708-329-4
... transformation of the nondecarburized area will reduce the favorable compressive stresses at the surface. In the worst case, the surface will be in tension up to the point of cracking. This is a more severe problem in steels with higher hardenability. Castings, forgings, cold-finished stock, and hot rolled...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006778
EISBN: 978-1-62708-295-2
... coefficient including a friction factor, D is the fastener diameter, and P is the tensile load. Assuming a predetermined torque for bare steel screws, the tension preload can be more than twice as high on lubricated fasteners. In this case, the reduced friction level resulted in a tension preload...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003543
EISBN: 978-1-62708-180-1
... factor, D is the fastener diameter, and P is the tensile load. Assuming a predetermined torque for bare steel screws, the tension preload can be more than twice as high on lubricated fasteners. In this case, the reduced friction level resulted in a tension preload sufficient to fracture the screws...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006760
EISBN: 978-1-62708-295-2
... case. 2% HF etch. (d) Steel fastener showing multiple laps in threads. (e) Section through lap showing grain flow around tip. ASTM 186 etch. Original magnification: 200× Seams These longitudinal discontinuities in bar or wire stock are caused by imperfections in the drawing die...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003554
EISBN: 978-1-62708-180-1
... of the situation. Furthermore, those cases where such embrittlement extends below the melting temperature of the embrittling metal, formerly known as stress alloying, are now termed solid metal induced embrittlement (SMIE). In either case, the metal-induced embrittlement is the result of subcritical crack growth...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001785
EISBN: 978-1-62708-241-9
... the chevron pattern on the face of the fracture surface. See Fig. 4 for details. Although all the wrenches were presumed to have been quarantined after the first incident, an additional wrench failed at a sister maintenance facility. Thankfully, no injuries occurred, and in this case the fracture...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001228
EISBN: 978-1-62708-229-7
... milled blades without binding wires and cover band. They did not fracture at the fastening, i.e. the location of highest bending stress, but in a central region which was 165 to 225 mm away from the gripped end. The blades were fabricated from a stainless heat-treatable chromium steel containing 0.2C...