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case hardness

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Published: 01 January 2002
Fig. 51 Case-hardness traverse of section used for Fig. 50 taken from tooth shown in Fig. 49(b) . More
Image
Published: 01 June 2019
Fig. 2 Case hardness traverse used to diagnose the problem of the hypoid pinion shown in Fig. 1 . More
Image
Published: 01 June 2019
Fig. 3 Case hardness traverse of section used for Fig. 2 taken from tooth pictured in Fig. 1 . Results are self-explanatory. More
Image
Published: 01 June 2019
Fig. 3 Hardness curve for case. Belastung = Load. Abstand in mm vom Rand = Distance from surface in mm. More
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Published: 01 June 2019
Fig. 7 Hardness profile at various locations along the length of the motor case in the as-received condition. More
Image
Published: 01 June 2019
Fig. 8 Hardness profile at various locations along the length of the motor case in the (a) resolution treated-reaged and (b) reaged condition. More
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c0048253
EISBN: 978-1-62708-234-1
... Abstract Two intermediate impeller drive gears (made of AMS 6263 steel, gas carburized, hardened, and tempered) exhibited evidence of pitting and abnormal wear after production tests in test-stand engines. The gears were examined for hardness, case depth, and microstructure of case and core...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c0048257
EISBN: 978-1-62708-217-4
... Abstract Evidence of destructive pitting on the gear teeth (AMS 6263 steel) in the area of the pitchline was exhibited by an idler gear for the generator drive of an aircraft engine following test-stand engine testing. The case hardness was investigated to be lower than specified...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c0048273
EISBN: 978-1-62708-225-9
... Abstract Several teeth of a bevel pinion which was part of a drive unit in an edging mill failed after three months in service. Specifications required that the pinion be made from a 2317 steel forging and that the teeth be carburized and hardened to a case hardness of 56 HRC and a core...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.rail.c0046238
EISBN: 978-1-62708-231-0
... Abstract Within about one month, several knuckle pins (AMS 6470 steel failed, and required to have a minimum case hardness of 92 h15N, a case depth of 0.4 to 0.5 mm (0.017 to 0.022 in.), and a core hardness of 285 to 341 HRB) used in engines failed over a range of 218 to 463 h in operation...
Image
Published: 15 January 2021
Fig. 3 Hard plastic carrying case with contents of field investigation kit ( Table 1 ) More
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c9001503
EISBN: 978-1-62708-234-1
..., and what has caused the existing hardness pattern. A section of a tooth at midlength is selected and prepared for a case hardness traverse and microscopic examination. A Case Hardness Traverse A case hardness traverse ( Fig. 2 ) revealed a definite tempering of the surface, along with a decrease...
Image
Published: 30 August 2021
Fig. 68 (Part 2) (e) Evolution of minimum static safety factor, S 0min , versus raceway material hardness and hardness depth. In this case, the hardness depth should be greater than 3.3 to 3.5 mm (0.13 to 0.14 in.) at 29.8 HRC. CHD, case-hardness depth; SHD, surface-hardness depth. Extracts More
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.conag.c9001497
EISBN: 978-1-62708-221-1
... the pinion teeth only; the gear need not be examined. Tooth bending fatigue demands a case hardness survey of the root radius and, of course, the midprofile. Also, a microscopic examination is necessary. There appears to be no difference in the wearing of any tooth; therefore, select any one...
Image
Published: 30 August 2021
characteristics. (a) Case hardening. CHD, case-hardness depth. (b) Induction hardening. SHD, surface-hardness depth. Source: Ref 1 , 2 More
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c0092148
EISBN: 978-1-62708-235-8
... of the seized valve (b) had much retained austenite that transformed to martensite in service, resulting in size distortion (growth). 500× Microhardness traverses of the two sections revealed that, in general, the hardness of the case from the failed part was about 100 Knoop points lower than the case...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.conag.c9001500
EISBN: 978-1-62708-221-1
..., a number of conclusions were drawn. The primary failure is definitely associated with the pinion; the gear need not be examined. The mode of failure must be determined through the concentrated load area. To accomplish this, a case hardness traverse must be made through a representative area...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.rail.c9001496
EISBN: 978-1-62708-231-0
.... The primary mode was tooth bending fatigue, both of the gear and of the pinion. Was the carburized case hard enough and deep enough at the root radius to have withstood normal loads? A case hardness traverse must be taken to determine case properties. Since the failure was at the root radius toward the toe...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.auto.c9001498
EISBN: 978-1-62708-218-1
... point of the active profile. A case hardness survey and a microscopic examination should be made of this area. Also, the tooth section should be taken near the open end of the pinion tooth through a medium amount of pitting, in order to study the mechanism of the pitting. Since there has been...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.conag.c9001501
EISBN: 978-1-62708-221-1
... and a case hardness traverse. Microscopic Examination The core structure contains an equal admixture of low-carbon martensite and lamellar pearlite. The case structure displays a very fine acicular martensite retaining less than 5% austenite. The pitted area low on the active profile shows evidence...