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case depth

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Published: 01 January 2002
Fig. 28 Applied stress versus case depth (net strength). More
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c9001214
EISBN: 978-1-62708-235-8
... had specified a 2 mm case depth and a hardness of at least HRC 55 at a depth of 1.5 mm. An etched cross section of the cracked end showed that the case layer had a depth of 2.3 mm, so that the sleeve was almost through-hardened at the flat ends. While the core material with the full wall thickness had...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001369
EISBN: 978-1-62708-215-0
... Abstract A crane long-travel worm drive shaft was found to be chipped during unpacking after delivery. Chemical analysis showed that the steel (EN36A with a case depth of 1 mm, or 0.04 inch did not meet specifications. Magnetic particle inspection revealed a crack on the side of the shaft...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.auto.c9001173
EISBN: 978-1-62708-218-1
... bath for 12 hours at 930 deg C. After tempering for 2 h at 170 to 175 deg C, the copper plate was removed by immersing in an acid bath for 45 min. The investigations found the microstructure, hardness, and chemistry all met the specification. The case depth was approximately 0.75 mm to 1.0 mm. The SEM...
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.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...
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...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c0045992
EISBN: 978-1-62708-225-9
... was specified to be case hardened to 55 to 60 HRC, with a case depth of 0.6 to 0.9 mm (0.025 to 0.035 in.); the hardness of the mating valve seat was 40 HRC. Analysis showed that the fracture occurred through two 8 mm (0.313 in.) diam holes at the narrowest section of the poppet. The valve continued to operate...
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
... fracture manufacturing defect chromium steel chevron marks needle-like martensite microhardness measurements case depth 30CrMnTi steel (chromium alloy steel) Background Workers at the locomotive assemble workshop reported that an abnormal sound was heard from the site of axle gearbox. Site...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c9001613
EISBN: 978-1-62708-235-8
...-0.40%, Mn-1.0-1.3%, P&S-0.035% max, Cr-0.8-1.1% Mechanical Properties: Core Strength — 1000–1200 MPa Core hardness — 310–370 HV Surface hardness in cup portion — 600–750 HV Case depth — 0.15–0.20 mm The Analysis Visual inspection of the fracture surface revealed a dull...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001300
EISBN: 978-1-62708-215-0
... discontinuities; however, the case depth was not uniform on both sides of each tooth. The case depth varied from approximately 1.8 mm (0.07 in.) on one side of the tooth, to approximately 1.3 mm (0.05 in.) on the other side. Fig. 10 Macroetched cross section through a gear tooth showing the geometry...
Image
Published: 01 December 1993
Fig. 10 Macroetched cross section through a gear tooth showing the geometry and thickness of the hardened case. Note the irregular case depth. Nital etchant, 1.86× More
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.machtools.c9001155
EISBN: 978-1-62708-223-5
...–60. The hardness of core should be HR C 33; HR C 40 was measured. Thus the surface and core hardnesses of both arbors were too high. The case depth should have been 0.6 to 0.7 mm. The hardness curves, which were normal, showed a case depth of 0.7 mm for the limiting hardness value of HV = 550 kgf...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001037
EISBN: 978-1-62708-214-3
..., and the depth of case penetration to a value of 50 HRC was measured. Results indicated a case depth of 0.89 to 1.0 mm (0.035 to 0.040 in.). Determination of case depth by visual examination on a microspecimen was 0.89 mm (0.035 in.). Discussion The principal causes of failure were inadequate heat...
Image
Published: 01 June 2019
Fig. 1 Valve seat fractures. (a) View of the seat fracture surface with intergranular near-surface features from the carburizing heat treatment. Scanning electron micrograph. 59×. (b) Cross section showing the case depth and the blunting of a secondary bending crack by the ductile core More
Image
Published: 01 January 2002
Fig. 7 Valve seat fractures ( example 5 ). (a) View of the seat fracture surface with intergranular near-surface features from the carburizing heat treatment. Scanning electron micrograph. 59×. (b) Cross section showing the case depth and the blunting of a secondary bending crack More
Image
Published: 15 January 2021
Fig. 7 Valve seat fractures (Example 5). (a) View of the seat fracture surface with intergranular near-surface features from the carburizing heat treatment. Scanning electron micrograph. Original magnification: 59×. (b) Cross section showing the case depth and the blunting of a secondary More
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
... of AMS 6263 steel and was gas carburized to produce a case 0.4 to 0.6 mm (0.015 to 0.025 in.) deep. Investigation Sections of the gear were removed and examined for hardness, case depth, and microstructure of case and core. The results of the examination and the specified requirements were...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001759
EISBN: 978-1-62708-241-9
... Hardness was measured on a micro hardness tester (load 1 kg) using a diamond indenter. Following readings were taken: Surface hardness: 566 Hv1 (specification: not available) Core hardness: 32 RC (specification: 30 HRC max) Case depth measurement: 8–10 μm (× 100 magnification) Push-Out Load...
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
...-carbon martensite. This indicates a well quenched and tempered structure. Case structure: Acicular martensite retaining approximately 10% austenite near the surface. Excellent structure for material and heat treatment. Case depth: (specified 0.075–0.090 in.) 0.085 in. effective depth...