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8640

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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
...Abstract Abstract An 8640 steel shaft installed in a fuel-injection-pump governor that controlled the speed of a diesel engine used in trucks and tractors broke after few days of operation. The mechanism that drove the shaft was designed to include a slip clutch to protect the governor shaft...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.conag.c0047392
EISBN: 978-1-62708-221-1
... from 0.40 to 0.44%. Except for the carbon content, composition of the castings corresponded to that of a high-manganese 8640 steel. The fracture occurred in the HAZ ( Fig. 1 ), where quenching by the surrounding metal had produced a hardness of 55 HRC. Fig. 1 Section through weld in a roadarm...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001808
EISBN: 978-1-62708-180-1
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006810
EISBN: 978-1-62708-329-4
.... The fractograph shows a crack pattern on the fracture surface that originated at the hole. Fig. 32 Shaft assembly in which the height of the pillow-block bearing caused misalignment of the extension shaft with the drive shaft, resulting in bending-fatigue fracture Fig. 33 Grade 8640 steel...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001811
EISBN: 978-1-62708-180-1
... is specified for shafts. Failures in shafts made of these steels can often be minimized by heat treatment. In other cases, it may be necessary to make shafts from quenched-and-tempered alloy steels, such as 4140 or 8640, which have excellent fatigue properties. For severe applications and large section sizes...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006830
EISBN: 978-1-62708-329-4
... can often be minimized by heat treatment. In other cases, it may be necessary to make shafts from quenched-and-tempered alloy steels, such as grade 4140 or 8640, which have excellent fatigue properties. For severe applications and large section sizes, grade 4340 or a comparable higher-alloy steel may...