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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.machtools.c9001250
EISBN: 978-1-62708-223-5
... 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 to such...
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
... 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 the...
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 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, and the micrograph...
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
... 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 in this region...
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
... 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 of the bolts...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006776
EISBN: 978-1-62708-295-2
... Abstract Fatigue failure of engineering components and structures results from progressive fracture caused by cyclic or fluctuating loads. Fatigue is an important potential cause of mechanical failure, because most engineering components or structures are or can be subjected to cyclic loads...
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 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. The...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006774
EISBN: 978-1-62708-295-2
... Abstract Engineering component and structure failures manifest through many mechanisms but are most often associated with fracture in one or more forms. This article introduces the subject of fractography and aspects of how it is used in failure analysis. The basic types of fracture processes...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003539
EISBN: 978-1-62708-180-1
... striations or discontinuous growth bands, depending on load levels and loading history. A brief discussion of fractography of fibrous organic-matrix structural composites is provided in Ref 31 . According to that article, fractography of fatigue failures in composite materials can be more difficult than...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003553
EISBN: 978-1-62708-180-1
... SCC, which occurs due to welding, metalworking process, and stress concentration, including options for investigation and corrective measures. It describes the sources of stresses in service and the effect of composition and metal structure on the susceptibility of SCC. The article provides...
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
... 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: C % Si % Mn % P % S % Cr % Mo % 0,36 0,42 0,80 0,019 0,011...
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
.... 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 appeared in part...
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
... concentrated caustic solution. Figure 4 shows the microstructure of the defect as seen from the substrate side of a free-standing deposit. The defect exists as a continuous, branched channel inside the EN coating ( Fig. 4 ). This observation indicates that the trapped particle had an elongated and fibrous...
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
... to approximately 0.38 mm (0.015 in.) to increase pin toughness. The fractured 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...
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
... 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 resulted from this treatment. The temperature of testing was...
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
... more fibrous ( Fig. 2 ) than the other fracture, which displayed tear ridges ( Fig. 3 ). Fig. 1 As-received chain link. 2×. Fig. 2 Fracture surface through weld joint. 3×. Fig. 3 Fracture opposite weld joint. 3×. Macrofractography identified the sequence of the...
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
... 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 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
... 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 to the...