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optical fractographs

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Published: 01 December 2019
Fig. 7 Optical fractographs of impact specimens extracted from failed base plate showing ductile dimple fracture: ( a ) magnification: 25× and ( b ) magnification: ×35 More
Image
Published: 01 December 1993
Fig. 3 Optical fractograph of Face A (arrow identifies crack origin). Approximately 0.81× More
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001293
EISBN: 978-1-62708-215-0
.... Region of significant wear is denoted by arrow. Fig. 3 Optical fractograph of Face A (arrow identifies crack origin). Approximately 0.81× Fig. 4 SEM showing intergranular mode of failure. Approximately 350× Fig. 5 EDS spectrum from within a pit adjacent to the fracture...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.conag.c9001633
EISBN: 978-1-62708-221-1
..., and zinc. The brown stain is assumed to be primarily iron oxide (the EDS system does not capture X-ray emissions from oxygen). Scanning electron microscopy fractograph and optical fractograph of the flat oxidized portions of the fracture surface ( Fig. 9 and 10 ) are consistent with a ductile fatigue...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001302
EISBN: 978-1-62708-215-0
... temperature. Fig. 4 Higher magnification SEM micrograph of the same fracture surface, showing dendritic MnS precipitates on the facets. This is an indication of incipient melting at the grain boundaries. Fig. 6 Optical micrographs of the spool region of failed kingpin. (a) Away from...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001380
EISBN: 978-1-62708-215-0
... One of the two AISI 4340 steel pitch horn bolts from the main rotor hub assembly failed while in service. Optical microscope revealed evidence of corrosion pitting in regions adjacent to the fracture. Fractographic examination utilizing a scanning electron microscope revealed multiple crack origins...
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
... the work rolls of a steel bar straightening machine were received for failure analysis. Visual inspection coupled with optical and scanning electron microscopy were used as the principal analytical techniques for the investigation. Fractographic analysis revealed the presence of a characteristic fatigue...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c0046227
EISBN: 978-1-62708-217-4
... milled section of the floor. An alkaline etch-type cleaner was used on the panels before chemical milling and before painting. Various tests and measurements indicated that the aluminum alloy used for the fuel-tank floors conformed to the specifications for 7178-T6. Low power magnification, fractographs...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001110
EISBN: 978-1-62708-214-3
... Fig. 2 Transverse fracture surface with beach marks (indicated by arrow) revealed by different oxide colors. Fig. 3 SEM fractograph from a transverse fracture surface, showing a relatively rough fracture surface and fatigue plateaus. 315×. Fig. 4 SEM fractograph from...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001118
EISBN: 978-1-62708-214-3
... 692 Avg 58.0 Fig. 9 Optical photograph of a transverse cross section through the wire of spring 1, showing the cross section of the drawing defect (void) that initiated the fatigue fracture. 1260×. Fig. 10 Optical photographs of a longitudinal section through the spring wire...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c0006448
EISBN: 978-1-62708-217-4
... Abstract Three wing flap hinge bearings were received by the laboratory for analysis. The bearings were fabricated from chromium-plated type 440C martensitic stainless steel. The intergranular fracture pattern seen in the electron fractographs, coupled with the corrosion pits observed...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001770
EISBN: 978-1-62708-241-9
... a stereomicroscope at the magnification of 10× to 35× and an SEM at higher magnifications to determine the fracture morphology. Results of the optical and SEM fractographies are shown in Figs. 7 and 8 , respectively. Fractographs of impact specimens show the typical ductile dimple fracture, as shown in Fig...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c0006387
EISBN: 978-1-62708-217-4
... of the fixture is at the top. 5×. (c) SEM fractograph of area A from (b). Note slight intergranular appearance of structure. 425×. (d) SEM fractograph of area B from (c) showing intergranular facets on the fracture surface. 1060× Electron optical examination of the fracture at low magnifications revealed...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c0006406
EISBN: 978-1-62708-217-4
... grain exposure ( Fig. 1c ), which would promote SCC. Electron optical examination of the fracture shown in Fig. 1(b) produced the scanning electron fractographs shown in Fig. 1(d) to (g) . Figures 1(d) and 1(e) show an intergranular topography, while the fractographs in Fig. 1(f) and 1(g...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001384
EISBN: 978-1-62708-215-0
... Fig. 1 Overall view of the broken assembly. ∼1× Fig. 2 Fracture surface of the draw-in bolt (bottom). (a) SEM fractograph of a field taken at the center of the fracture surface. Note the hair-line cracks along the grain facets (hydrogen embrittlement) and the ductile dimples (tension...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001390
EISBN: 978-1-62708-215-0
... Fig. 1 SEM fractograph revealing severe cracking in a portion of a failed heater Fig. 2 SEM micrograph showing typical transgranular SCC fracture in a failed heater Fig. 3 SEM micrograph showing transgranular SCC and dimple fracture regions Fig. 4 Optical...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001778
EISBN: 978-1-62708-241-9
... ) 500× Fig. 5 Etched optical microstructures of 53 mm LCTR (transverse section) round wire sample showing surface and subsurface decarburization. ( a ) 200×. ( b ) 500× Fig. 6 SEM fractographs of the fracture surface of the 40 mm LCTR round wire. ( a ) Overall view, 20×. ( b...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001095
EISBN: 978-1-62708-214-3
... for examination. Circled area surrounds the intact 1 4 -20 cap screw. Fig. 6 Motor housing after partial reconstruction of the gear side. Circled areas (1 to 3) are locations of specimens of threaded engagement for SEM examination. Fig. 7 Optical photograph of the motor side...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003532
EISBN: 978-1-62708-180-1
... metallographic equipment. Examination of Fractures Microfractography is a relatively new field; its roots can be traced to the light optical fractographs published by Zapffe and coworkers ( Ref 4 ) beginning in the early 1940s, although a few studies of historical value predated their efforts. Zapffe's...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001322
EISBN: 978-1-62708-215-0
... marked “a” is shown magnified in Fig. 4 . Fig. 4 Higher-magnification SEM fractograph of area marked “a” in Fig. 3 . Fracture surface shows intergranular facets and quasi-cleavage river patterns. Note convergence of river lines from outer side to tube to inner side. Fig. 5 Optical...