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surface hardness measurement

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Published: 01 December 2019
Fig. 8 The locations of hardness measurements below cracked surface More
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
... after it broke, which resulted in extensive loss of metal between the holes. 80x micrograph and 4x macrograph of a 5% nital etched longitudinal section, and chemical analyses showed the poppet did fit 1213 or 1215 specs. However, hardness measurements showed surface hardness was excessive-61 to 65 HRC...
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
... × 2. Check on Dimensions The sharpness of the groove/flange transition was visible with the naked eye alone. A check on the dimensions showed that the radii were only 0.15 and 0.2 mm. 3. Hardness Measurement of the surface hardness yielded values of HR C 65. The specified value was HR C 58...
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
... on a Rockwell hardness tester with 150 kg load using a diamond indenter. The following readings were taken for the sample: Surface hardness: 62 HRC (specification: 58–64 HRC) Core hardness: 42 RC (specification: 30 HRC max) The hardness measurement of the specimen was done on a straight line from...
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: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001116
EISBN: 978-1-62708-214-3
... at the outside surface. Metallographic analysis showed that the fracture originated in the upturned fibers adjacent to the ERW bond line. Cross sections of the weld were removed from three random locations in the test sample. At each location, the up turned fibers of the weld zone contained bands of hard...
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
.... Thimbles were to be made of cast 8625 steel, but no heat treatment or hardness were specified. Analysis (visual inspection, hardness testing, and metallographic examination) supported the conclusion that the wear was due to strikingly difference hardness measurements in the bolt and thimble...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006761
EISBN: 978-1-62708-295-2
... surface finish, flat surface, and parallel sides Sample must fit within the machine and be balanced on the pedestal Vickers hardness Hardness Test is slow Careful surface preparation of the specimen is necessary Measurement of indentation is operator dependent and results in variation...
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
... for 4140 steel. Core hardness was in the required range of 27 to 31 HRC (264 to 294 HB). Total case depth, as determined by the microscopic method on polished specimens etched in 2% nital, was satisfactory. Surface hardness, as measured using a Knoop indenter, was equivalent to 50 HRC, substantially lower...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.auto.c0047121
EISBN: 978-1-62708-218-1
... Abstract A 1050 steel crankshaft with 6.4 cm (2.5 in.) diam journals that measured 87 cm (34.25 in.) in length and weighed 31 kg (69 lb) fractured in service. The shaft had been quenched and tempered to a hardness of 19 to 26 HRC, then selectively hardened on the journals to a surface hardness...
Image
Published: 01 June 2019
Fig. 5 Map of hardness of outside surface of piece 5-1-D, compiled from hardness measurements using Rockwell hardness tests (subsequently, converted to Knoop hardness) and Knoop hardness measurements. More
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.matlhand.c9001451
EISBN: 978-1-62708-224-2
... , and a series of Brinell hardness measurements were carried out, using a 2 mm. ball with a load of 120 kg. The results are indicated in Figure 7 . It will be noted that there is a sharp increase in the surface hardness at the transition from the sides of the hook to the working surface the values obtained...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001760
EISBN: 978-1-62708-241-9
... of the material was determined to be 121 HB 5/250 which is higher than the lower limit of the specification (90 HB) due to the higher amount of silicon. Fig. 8 The locations of hardness measurements below cracked surface Fig. 9 The locations of hardness measurements on the cylinder head...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001761
EISBN: 978-1-62708-241-9
... electron microscope (SEM) equipped with electron-dispersive X-ray analysis (EDAX). Microhardness gradient through the nitrided layer close to fracture, surface hardness, and macrohardness at the journals were all measured. Fractographic analysis indicated that fatigue was the dominant mechanism of failure...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001823
EISBN: 978-1-62708-241-9
... the feature, which had a semi-hemispherical shape. The through-wall portion of the feature is indicated in both figures. The feature on the external surface was approximately 1.1 cm in axial length by 1.2 cm in circumferential length. It was 0.40 cm (83% of wall thickness) in depth (measured using a Thorpe...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.machtools.c0047840
EISBN: 978-1-62708-223-5
.... As a corrective measure, the hole through the square end of the mandrel was incorporated into the design of the tool and was drilled and reamed before heat treatment and specified hardness of the threaded portion and square end of the mandrel was reduced. Drilling Electric discharge machining Rockwell...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001348
EISBN: 978-1-62708-215-0
... in the dished end. Hardness and residual stress measurements indicated high levels of residual stress. From metallographic and visual examinations, it was inferred that the cracks had initiated from the outside surface and were typical stress-corrosion cracks. The mode of fracture was intergranular...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001310
EISBN: 978-1-62708-215-0
... attacked surface ( Fig. 3b ) showed evidence of dezincification. In the crevice ( Fig. 3 and 4 ), complete loss of zinc was observed. Dezincification was also observed up to about 50 µm beyond the bottom of the crevice. Hardness measurements on the cross section (Fig. 3b ) indicated low values up...
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
... using a 15-kg (33-lb) load. These measurements confirmed the low hardness and suggested that it had resulted from one or more surface defects. A specimen from the pitted area of one gear tooth was prepared for metallographic examination. The results of this examination are shown in Fig. 1 . When...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.matlhand.c0048052
EISBN: 978-1-62708-224-2
... on the inside surfaces of the links. A further reduction in ductility was believed to have been caused by lower temperatures during winter months. Thus, the failure was concluded to have been caused in a brittle manner caused by the notch sensitivity of the high hardness material at lower temperatures...