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scanning electron fractography

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Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001828
EISBN: 978-1-62708-241-9
... to establish the root cause of the failure included chemical and metallurgical analysis, scanning electron fractography, mechanical property testing, finite element analysis of the shrink fitted journal, and a design review of the assembly fits. The journal failure was attributed to corrosion fatigue...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001052
EISBN: 978-1-62708-214-3
... followed a multidirectional/circular pattern, occasionally chipping off the convolutions, an indication of high-resonance fatigue-type cracking. Scanning electron fractography showed fatigue striations throughout the fracture surface. The microstructure consisted of relatively large grains and an abnormal...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c9001733
EISBN: 978-1-62708-225-9
... obtained. 1 A wealth of information about the microscopic aspects of a failure exists on a fracture surface. 2 Electron fractography has become a valuable tool for use in analyzing a fracture surface. Ref 3 , 4 , 5 , 6 , 7 The scanning electron microscope (SEM) offers resolution better than...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003536
EISBN: 978-1-62708-180-1
... that are based on fracture profilometry. This is followed by a section describing the methods based on scanning electron microscope fractography. The article also addresses procedures for three-dimensional fracture surface reconstruction. In each case, sufficient methodological details, governing equations...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003533
EISBN: 978-1-62708-180-1
... discussed. display equipment electron optical column fractography microstructure sample preparation scanning electron microscopy signal detection vacuum system THE SCANNING ELECTRON MICROSCOPE (SEM) is one of the most versatile instruments for investigating the microstructure of metallic...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006769
EISBN: 978-1-62708-295-2
... should be given the opportunity to examine the specimen before it is prepared for examination in the SEM or altered in any other way. Application of Scanning Electron Microscope in Fractography Fractography is one of the most common applications of SEM. The large depth of focus, the possibility...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001042
EISBN: 978-1-62708-214-3
... to be sound. No lamination was found, only minor nonmetallic inclusions that are normal in a stainless steel. Testing Procedure and Results Surface Examination Scanning Electron Microscopy/Fractography Scanning electron microscopy/fractography ( Fig. 1 ) showed only striations and arrest patterns...
Image
Published: 30 August 2021
Fig. 14 (a) Brittle fisheyes appear as bright spots in gray ductile matrix. Original magnification: 1.7×. (b) Mixed-mode fracture in as-welded three-point bend-test specimen at room temperature (scanning electron microscope). Optical fractography. Original magnification: 1500× More
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.med.c9001606
EISBN: 978-1-62708-226-6
... Abstract Failures of four different 300-series austenitic stainless steel biomedical fixation implants were examined. The device fractures were observed optically, and their surfaces were examined by scanning electron microscopy. Fractography identified fatigue to be the failure mode for all...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.matlhand.c0091092
EISBN: 978-1-62708-224-2
.... Investigation (visual inspection, inspection records review, optical and scanning electron microscopy, and fractography) supported the conclusion that the fracture mode for both shafts was low-cycle rotating-bending fatigue initiating and propagating by combined torsional and reverse bending stresses...
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
... were subsequently welded over with 308 stainless steel filler wire and the base plate was replaced with new material. Soon after, the tank began leaking along the weld bead, triggering a full-scale investigation; spectroscopy, optical and scanning electron microscopy, fractography, SEM-EDS analysis...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001041
EISBN: 978-1-62708-214-3
... section and an internal fillet-welded diaphragm. Sections from each of the cross members were subjected to a complete analysis, including chemical analysis, magnetic particle testing, mechanical testing, scanning electron microscope/fractography, and metallography. The primary mode of failure was found...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001075
EISBN: 978-1-62708-214-3
... Abstract Several type 316L stainless steel wires in an electrostatic precipitator at a paper plant fractured in an unexpectedly short time. Failed wires were examined using optical and scanning electron microscope, and hardness tests were conducted. Fractography clearly established...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001144
EISBN: 978-1-62708-217-4
.... Fractographic analysis of the fractures by scanning electron microscopy revealed striations typical of fatigue, as shown in Fig. 3 . Each striation usually corresponds to a single load cycle ( 1 , 2 , 3 ). The striation pattern indicated random loading with additional distinct spike load indications...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001038
EISBN: 978-1-62708-214-3
... not be released for testing. Therefore, the investigation was limited to nondestructive means, including photographic examination (visually and at 10× magnification) of the wheel and replication of pertinent fracture surfaces for further study via scanning electron microscope (SEM) fractography. Visual...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.med.c0048400
EISBN: 978-1-62708-226-6
... a tension band fixation containing a cerclage wire, two screws, and washers beneath the screw heads. See also Fig. 2 . Fig. 2 Intercrystalline corrosion of a type 304 stainless steel cerclage wire. (a) Broken cerclage wire. (b) Energy-dispersive x-ray analysis under the scanning electron...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001097
EISBN: 978-1-62708-214-3
... mode was fatigue. Scanning Electron Microscopy/Fractography Transverse cross sections of the broken screws were metallurgically polished. Figure 2 shows the plan view of the surface of a broken screw. Figure 3 is a magnified side view of the fracture surface, revealing the corrosion pits...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001090
EISBN: 978-1-62708-214-3
... to fracture. Fig. 1 Failed stainless steel flexible connector. Fig. 2 Inside view of outer end of connector where the bellows fractured. Fig. 3 Portion of the bellows containing the fracture. Surface Examination Scanning Electron Microscopy/Fractography SEM examination...
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
... of materials since the 1950s, and scanning electron microscopes (SEMs) have been commercially available since 1965 ( Ref 23 ). Today (2020), the SEM is standard equipment for any laboratory performing failure analysis and fractography. The SEM offers significantly superior resolution and depth of field...
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
.... Fig. 4 Fracture surface of weld joint. 10×. Fig. 5 Fracture surface opposite weld joint. 10×. Scanning Electron Microscopy/Fractography Examination by scanning electron microscopy (SEM) of the origin of fracture at the weld joint revealed equiaxed dimple formations characteristic...