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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.conag.c0047479
EISBN: 978-1-62708-221-1
...Abstract Abstract A cast dragline bucket tooth failed by fracturing after a short time in service. The tooth was made of medium-carbon low-alloy steel heat treated to a hardness of 555 HRB. The fracture surface was covered with chevron marks. These converged at several sites on the surface...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c0047428
EISBN: 978-1-62708-235-8
...Abstract Abstract A cast dragline bucket tooth failed by fracturing after a short time in service. The tooth was made of medium-carbon low-alloy steel heat treated to a hardness of 555 HRB. The fracture surface was covered with chevron marks. These converged at several sites on the surface...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001849
EISBN: 978-1-62708-241-9
... revealed the presence of a characteristic fatigue crack propagation pattern (beach marks) and radial chevron marks indicating the occurrence of final overload through a brittle intergranular fracture. The collected evidence suggests that surface-initiated cracks propagated by fatigue led to spalling...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c0048164
EISBN: 978-1-62708-217-4
.... It was indicated by chevron marks that brittle fracture had started beneath the brinelled area at the forward edge of the upper surface of the spring. The origin of the brittle fracture was found to be a small fatigue crack that had been present for a considerable period of time before final fracture occurred...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.petrol.c9001142
EISBN: 978-1-62708-228-0
... steps were observed. The fractured surface was smooth and flat below it, and the chevron pattern was observed near the bottom end of the fractured surface. Therefore it was proved that the crack, advancing from the bottom of flaw caused by the deep drawing, extended longitudinally upward from...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003507
EISBN: 978-1-62708-180-1
..., internal bursts or chevron cracks, cracks on free surfaces, cracks on die-contacted surfaces Metal-flow-related problems: for example, end grain and poor surface performance; inhomogeneous grain size; shear bands and locally weakened structures; cold shuts, folds, and laps; flow-through defects...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.petrol.c9001167
EISBN: 978-1-62708-228-0
... 900°C. The general appearance of the failed coupling is shown in Fig. 1 . The fracture surface was heavily corroded due to its exposure to sea water but nevertheless the directions of crack propagation could be determined from the orientation of the clearly defined chevron markings. These chevron...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.chem.c9001534
EISBN: 978-1-62708-220-4
... differed in thickness, had a sharp taper of 2 to 3 mm on the inner surface. Fig. 1 As-received failed condenser tube Fig. 2 Schematic showing directions of crack propagation, as indicated by chevron marks All fractured surfaces were associated with chevron marks. The directions...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c9001537
EISBN: 978-1-62708-234-1
... above and through the flange. The part was loaded so that tensile stresses were imposed normal to the transverse grain above the flange. As shown in Fig. 1 , the fracture surface of the crack contained chevron markings. But when the fracture face was examined by light microscopy, observers could...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001053
EISBN: 978-1-62708-214-3
..., in that they were flat (no shear lips), perpendicular to the plate surface, and covered with chevron marks. The chevron marks enabled the propagation direction of each crack to be determined, as indicated by the arrows in Fig. 3 . They point to an origin at the toe of one of the nozzle welds on the inside diameter...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.chem.c0048840
EISBN: 978-1-62708-220-4
... (plates A to D, Fig. 2 ), then branched into the rest of the vessel. All fracture surfaces were classical flat fractures, with no shear lip and chevron markings on all fractures except the fracture immediately at the shroud-support ring. At the ring, the chevron patterns suggested that the crack had...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.rail.c9001585
EISBN: 978-1-62708-231-0
... approximately at the right dashed line, and unlabeled arrows indicate the direction of crack propagation. (Transverse cuts were made at the locations indicated by the dashed lines to facilitate SEM, EDS, and microstructural examination of the origin area.) The chevron pattern appeared to emanate from stripe...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.petrol.c9001148
EISBN: 978-1-62708-228-0
... section of pipeline indicating crack path and direction as determined from Chevron markings. Fig. 2 Schematic of section of pipeline which ruptured in service. Fig. 3 Schematic of ruptured portion of section of pipeline that failed in service. Dotted lines indicate subsequent torch...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.pulp.c0048804
EISBN: 978-1-62708-230-3
.... Fracture surface were found to exhibit chevron marks typical of fatigue or raised points or tears pointing in the direction of the probable origin of failure. The characteristics of the thinwall cast iron structures like the variation in composition due to pouring from multiple ladles, variation...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001820
EISBN: 978-1-62708-180-1
...Types of defects that can cause pipeline failures Table 1 Types of defects that can cause pipeline failures Causes of preservice test failures Defects in the pipe body Mechanical damage Fatigue cracks Material defects Longitudinal weld defects Submerged arc...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001762
EISBN: 978-1-62708-241-9
... with a classic point origin Fig. 8 A small origin area of intergranular fracture and 10–50% very fine microvoids was observed at the point of the chevrons. Both modes are shown here at 0.25 mm from the surface Axle 2 contained a linear crack origin. This is shown in Fig. 9 . The chevron marks...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001120
EISBN: 978-1-62708-214-3
... at an electrical-discharge-machined surface where the resulting rehardened layer had not been removed. This rehardened layer had cracked, providing a source for fatigue initiation. Electrical discharge machining H13 UNS T20813 Fatigue fracture Metalworking-related failures Background A broken...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001725
EISBN: 978-1-62708-229-7
... by the naked eye and by microscope. Figure 3 shows one of the original fracture surfaces. There was little evidence of plastic deformation. This indicates a brittle break, a conclusion substantiated by a chevron pattern (only indistinctly shown in the lower part of the photograph), indicating that a crack...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001035
EISBN: 978-1-62708-214-3
... and dimples. No evidence of prior cracking was found. The exemplar specimens from the simulation impact testing failed in a manner consistent with that observed in the axle. The examination confirmed that the failure was a one-time impact overload fracture and not the result of any prior crack in the material...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001114
EISBN: 978-1-62708-214-3
... produced by rapid cooling after welding. The microcracks in the HAZ were produced by thermal shrinkage strains acting on a weld HAZ that had been embrittled by an excessive cooling rate. The failure propagated in the base material, which had low toughness and thus low crack resistance. Chevron marks...