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Fibrous structure

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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.chem.c9001174
EISBN: 978-1-62708-220-4
... externally to room temperature in this unit. The fracture had the typical flat-gray fibrous structure of a material destroyed by hydrogen. Specimens for the metallographic investigation showed that the structure appeared to have been loosened by intergranular separations. DVM notched impact specimens from...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.machtools.c9001250
EISBN: 978-1-62708-223-5
.... After etching with 5% nital the polished surface exhibited a pronounced, easily-visible, fibrous structure. Microscopic examination revealed that this etch pattern was produced by marked segregation bands. The very unfavorable structure for a high speed steel tool of these dimensions and subject...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.machtools.c0047154
EISBN: 978-1-62708-223-5
...Abstract Abstract The head of a socket spanner made of heat-treated 0.40C-0.34Cr steel cracked in service. The pronounced fibrous structure of the component became evident as soon as it was etched with 2% nital. Folds in the material originating from the shaping process were visible...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c9001394
EISBN: 978-1-62708-234-1
... of 2 to 4 at temperatures of 80 to 90 deg C (176 to 194 deg F). The fracture was unusual in that it was of a fibrous nature, the fibers-which were orientated radially-were readily detachable. The surface of the spindle adjacent to the fracture had an etched appearance and the mode of cracking...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.bldgs.c9001204
EISBN: 978-1-62708-219-8
... of the fracture proved that the seam had cracked while exposed to heat. The other bolt (2) had cracked outside of the weld seam closely under the head. The fracture had a slightly fibrous structure ( Fig. 2 ). Neither one had been particularly deformed before fracture. Figs. 3 and 4 are lateral views...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c9001254
EISBN: 978-1-62708-225-9
... conchoidal. Fig. 1 Fracture of a tensile specimen with partially conchoidal structure. 2 × Six test bars from as many melts were examined. According to the data provided by the sender the mean composition varied little and was as follows: Because melting in the basic arc furnace and strong...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003538
EISBN: 978-1-62708-180-1
... article in this Volume, “Fracture Appearance and Mechanisms of Deformation and Fracture.” In a smooth cylindrical tensile specimen, failure most commonly initiates by inclusion-matrix interface debonding near the centerline. This results in a central fibrous region that is normal to the applied load...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006775
EISBN: 978-1-62708-295-2
..., as discussed in the article “Fracture Appearance and Mechanisms of Deformation and Fracture” in this Volume. In a smooth cylindrical tensile specimen, failure most commonly initiates by inclusion-matrix interface debonding near the centerline. This results in a central fibrous region, which is normal...
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
... significantly to the failure. Fig. 1 Section through fractured ball showing secondary cracking. 25 × The general structure of the pin was martensitic with a surface case depth of approximately 0.75 mm to 1.0 mm. The core and case hardnesses were 407 HV and 670 HV respectively. Analyses of the core...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c9001589
EISBN: 978-1-62708-235-8
... and fibrous morphology. Again, the EDS spectra collected at different spots inside this channel failed to detect any impurity. Fig. 4 Secondary electron images showing cross-sections of the defects. The EDS spectrum shows the composition inside the hole underneath one of the defects. Finally...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.conag.c9001449
EISBN: 978-1-62708-221-1
... with a hacksaw on one of the 1 in. faces prior to testing, cracked in a brittle manner at a bend angle of 30° to give a crystalline fracture. A second notched test piece, normalised at 900°C. before testing, broke at A an angle of 45° but gave a fibrous fracture, showing that some improvement in notch ductility...
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
... in the dovetail region, causing extensive damage throughout the turbine. Remedial measures were suggested to prevent such failures in the future. aircraft turbine blades fatigue fracture operating overload nickel-base alloy fatigue cracking fractographic analysis fracture surface structure Nimonic...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c9001158
EISBN: 978-1-62708-225-9
... springs. Surface defects Valve springs Spring steel Surface treatment related failures Fatigue fracture Ductile fracture The fractured valve spring shown in Fig. 1 showed a small fatigue fracture and a large ductile fracture emanating from it in the fibrous fracture structure, that also...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001377
EISBN: 978-1-62708-215-0
.... A central fibrous-appearing area, through which the multiple origins were joined, appeared adjacent to these faceted regions. In general, the faceted regions occurred on one side of the periphery. On the opposite side, the fibrous central area transformed to a shear lip region. Fig. 5 Perspective...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c0089256
EISBN: 978-1-62708-235-8
...Abstract Abstract Alloy steel forgings used as structural members of a ski chair lift grip mechanism were identified to have contained forging laps (i.e., sharp-notched discontinuities) during an annual magnetic particle inspection of all chair lift grip structural members at a mountain resort...
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
... faces of sample 1 were battered, but showed a fairly smooth annular ring around both the outer and inner diameters with a ductile and fibrous core. The condition of the fractured faces did not permit the definite establishment of a fatigue failure. Figure 2 shows the dimensions of a pin. The machining...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001134
EISBN: 978-1-62708-214-3
... to separate in two. The exterior surfaces were slightly oxidized ( Fig. 1 ). All fracture surfaces appeared clean, gray, and normal to the axis. The fracture at the weldjoint appeared more fibrous ( Fig. 2 ) than the other fracture, which displayed tear ridges ( Fig. 3 ). Fig. 1 As-received chain link...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.auto.c9001612
EISBN: 978-1-62708-218-1
... for fractography, microstructural, and chemical analysis is presented in Fig. 2 . The fracture surface was shiny/grainy at the spot weld nugget (fracture origin) and fibrous in the other areas (away from origin), as illustrated in Fig. 3 and 3 . These features indicated that the fracture was brittle in nature...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001121
EISBN: 978-1-62708-214-3
.... The appearance of the color indicated that the oxidation process took place at about 204 °C (400 °F). Area b in Fig. 4 shows the typical fmal fracture zone, which had a fibrous condition that developed under impact. Another surface condition observed in this area was the machined hp on top of the small...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001267
EISBN: 978-1-62708-215-0
... of the fatigue fractures initiated at an inclusion ( Fig. 3 ), the as-polished cross sections showed a low concentration of microstructural anomalies, such as inclusions, which may have caused stress concentrations. The etched microstructure, typical for music wire, was an elongated structure characteristic...