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scoring marks

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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.usage.c0046366
EISBN: 978-1-62708-236-5
...Abstract Abstract Several large chromium-plated 4340 steel cylinders were removed from service because of deep longitudinal score marks in the plating. One of the damaged cylinders and a mating cast aluminum alloy B850-T5 bearing adapter that also exhibited deep longitudinal score marks were...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.steel.c0089617
EISBN: 978-1-62708-232-7
... Acknowledgments Visual inspection of the bore of the mold revealed three large score marks originating at the spalls. The spalls were not all located at the same distance from the end face of the spigot but were helically distributed on the inner surface at the 1, 6:30, and 11 o'clock positions. The spall...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001799
EISBN: 978-1-62708-241-9
... the bearings led to the transfer of material. gear shaft fatigue fracture seizing high-strength low-alloy steel scoring marks deformed grains uniaxial fatigue testing macrofeatures 4145 (high-strength low-alloy steel) UNS G41450 Introduction Service History Observations and Analyses...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001796
EISBN: 978-1-62708-241-9
... of the bearing illustrating areas of the applied preloading is shown in Fig. 2b . The raceways and rolling elements exhibited uniform fluting-type damages on both contact surfaces with no evidence of fatigue spalling damage. In addition, scoring marks attributed to hard particle contaminations, such as silicon...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001587
EISBN: 978-1-62708-217-4
... of the splines, approximately 0.25 in. (6.4 mm) wide, was damaged but not stripped at any circumferential location. This middle portion corresponds to the groove in the jackscrew splines for the stop clamp bolt. The circumferential scoring marks associated with the stripped areas of the spline teeth were...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c0046222
EISBN: 978-1-62708-217-4
...). Dimensions given in inches. (b) Longitudinal score mark (region A) and circumferential scratches (arrow B) on shank that had been peened over. A galled area (arrow C) is also visible. At every overhaul, the spindles were fluorescent-magnetic-particle inspected, and the surface was carefully examined...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c9001425
EISBN: 978-1-62708-235-8
... about 1 in. long, one of which terminated in the form of a pronounced, curved groove running axially along the external surface as indicated by the arrows in Figure 1 . On the bore side, numerous longitudinal score markings were to be seen, these presumably being produced during the manufacture...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c0046233
EISBN: 978-1-62708-235-8
... (at fillet between shank and fork). Dimensions given in inches. (b) Longitudinal score mark (region A) and circumferential scratches (arrow B) on shank that had been peened over. A galled area (arrow C) is also visible. Metallographic examination showed that both castings and the tubing had...
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
... present in the already too small radii ( Fig. 6 ). Fig. 4 a). Microstructure of core 100 × b). Microstructure of core 500× Fig. 5 Microstructure of case. 100× Fig. 6 Radius between groove and flange with crack-like score marks. 200 × The appearance of the fracture...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.chem.c9001403
EISBN: 978-1-62708-220-4
... responsible for the stress-corrosion cracking were residual ones introduced at the time of bending. The fact that some of the cracks followed the score marks within the tube is also indicative of failure from this cause. The reason for the intergranular cracking was not so apparent. Unstabilised austenitic...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001729
EISBN: 978-1-62708-217-4
... forced against a blunt metal edge by a motion upward and to the left. (The edge would have to be blunt because of the manner in which the aluminum has been pushed out of the way.) Also shown are grooves or scoring marks made by the cutting edge revealed when the cut was opened. These grooves indicate...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c9001485
EISBN: 978-1-62708-225-9
... in thrust bearings if the shoulder against which the race abutts is not square with the shaft. The relative motion which occurs leads to the production of heavy score marks and to the development of polished zones, both in the bore of the race and orb the shaft. The end face of the race, which...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001848
EISBN: 978-1-62708-241-9
..., and the logos of the valve are not completely formed. Wear mechanisms did not fully develop on the surface of the valve. However, there was evidence of abrasive wear and die adhesion on the edge of the valve, which was characterized by fine score marks and a flaky surface morphology, Fig. 13b...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001756
EISBN: 978-1-62708-241-9
... excitations and or by combustion instabilities. Mechanical vibrations causing fatigue failure in HP turbine blades could not be ruled out as bearings were rejected because of scoring marks and brinelling. Rotor imbalance might have excited the failure but could not be ascertained because of lack of evidence...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001810
EISBN: 978-1-62708-180-1
... produces heavy score marks and polished regions, both in the bore of the inner ring and on the shaft. The end face of the ring, which is in frictional contact with the shoulder on the shaft, shows a characteristic scuffing effect typified by heavy circumferential score marks and, in severe cases, by short...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003508
EISBN: 978-1-62708-180-1
...: Discontinuities, generally at intersections, caused by mechanical effects (rupture) C 110: Normal cracking C 111 (a) Normal fracture appearance, sometimes with adjacent indentation marks Breakage (cold) C 120: Cracking with oxidation C 121 (a) Fracture surface oxidized completely...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003522
EISBN: 978-1-62708-180-1
... the surfaces produces a series of indentations, shown in Fig. 15 . Fig. 15 “Tire tracks” on a fatigue fracture surface of a 4140 steel quenched and tempered at 700 °C (1292 °F) Nonfracture Features Nonfracture features of interest include rub marks or scores, indentations, deposits of other...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006757
EISBN: 978-1-62708-295-2
... of the score marks. Where unexpected wear between components in relative motion is encountered, and lubrication is observed to have been adequate, it is important to look for possible contaminants. These may arise from some other component in the system (for example, through the loss of hard chromium...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006831
EISBN: 978-1-62708-329-4
...-shrinkage, shrinkage porosity, leaders Discontinuities C 100 Discontinuities, generally at intersections, caused by mechanical effects (rupture) C 100 Normal cracking C 111 (a) Normal fracture appearance, sometimes with adjacent indentation marks Breakage (cold) C 120...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006791
EISBN: 978-1-62708-295-2
... temperatures Explains the appearance of the first scuffing marks in localized zones along the meshing line Complex numerical model Large number of calculations Very sensitive to load-share function (not applicable for high-load, low-speed conditions) Global scuffing criteria...