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microfractography

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Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006760
EISBN: 978-1-62708-295-2
... and for cleaning fracture surfaces. It discusses damage characterization of metals, covering various factors that influence the damage, namely stress, aggressive environment, temperature, and discontinuities. damage characterization failure analysis fracture surfaces metals microfractography optical...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001193
EISBN: 978-1-62708-229-7
... or partially as fatigue cracks produced by vibration in the operation of the turbine as a result of steplike growing of microcracks could not be deduced from the fracture surfaces. Microfractography showed that the cracks developed in stages. Brazing Residual stress Steam turbines X20Cr 13 Joining...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003520
EISBN: 978-1-62708-180-1
...Abstract Abstract This article outlines the basic steps to be followed and the range of techniques available for failure analysis, namely, background data assembling, visual examination, microfractography, chemical analysis, metallographic examination, electron microscopy, electron microprobe...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001058
EISBN: 978-1-62708-214-3
....” Testing Procedure and Results Surface Examination Microfractography Fracture surfaces on both parts of the submitted 32 mm ( 1 1 4 in.) plug showed no evidence of fatigue or of any preexisting crack or cavity ( Fig. 3 and 4 ). The portion of the plug that was freed from the system...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001845
EISBN: 978-1-62708-241-9
... platelets ( Fig. 4b ). No evidence of ductile fracture was noticed on the failed fracture surfaces. However, microfractography of the artificial fracture ( Fig. 4f ) confirmed the tough nature characterized by dimple morphology. Also, no dark flakes were detected in the regions. EDX was performed to analyze...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001838
EISBN: 978-1-62708-241-9
.... pipe hot cracking grain boundary segregation stainless steel tear ridges melt bridging microfractography induction heating frequency X6CrNiMoTi17-12-2 (titanium-stabilized austenitic stainless steel) UNS S31635 Introduction Large austenitic stainless steel piping used for manifolds...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001057
EISBN: 978-1-62708-214-3
... Microfractography In order to expose the crack surface for examination, a cut was made parallel to and 13 mm ( 1 2 in.) from the crack, and a 13 mm ( 1 2 in.) wide strip containing one of the fracture surfaces was removed from the nipple. Fig. 2 shows the exposed mating fracture surfaces...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001077
EISBN: 978-1-62708-214-3
... to failure from external sources was minimal. There was little evidence to suggest that any abnormal loading of the gear had taken place. Both macrofractography and microfractography revealed that cracking initiated internally in a region of defective material in a heavily loaded area of the two gear teeth...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001026
EISBN: 978-1-62708-214-3
.... The overload fracture resulting from breaking open this crack was identical to the apparent overload areas of the original fracture, consisting of nearly microscopic cleavage facets. Fig. 3 SEM macrograph of area of flakes 2 (upper) and 3 (lower), showing cleavage step patterns. Microfractography...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006757
EISBN: 978-1-62708-295-2
... briefly discussed. ceramic materials corrosion damage macroscopic examination metallic components metallographic specimens microchemical analysis microfractography microstructure polymers visual examination wear EXAMINATION of a damaged component involves a chain of activities...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.bldgs.c9001544
EISBN: 978-1-62708-219-8
... radius; but after the part cracked in the shop, the radius shown here was milled on all four junction pieces used on the bridge. The repair weld material was not determined, but it is apparently a tougher material than the base metal. Metallography and electron microfractography completed...
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
... mill for failure analysis. Visual inspection, macro-and microfractography along with optical microscopy and microhardness testing were used to determine the cause of the observed spalling. Experimental Procedure Cleaning dust, metal fines, and oil residues from the samples was performed...
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
.... , “ Use of Microfractography in the Study of Fatigue Crack Propagation under Spectrum Loading ,” Fractography in Failure Analysis , ASTM STP 645, 213-3Z ( 1978 ). 10.1520/STP38093S 4. McSwain R. H. , “ Digital Fractographic Imaging Analysis ,” Ph.D. Dissertation, University of Florida...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003518
EISBN: 978-1-62708-180-1
... and other methods. Cracks, porosity, and unsoundness of various types may be able to be detected without cutting the part. Microfractrography and other techniques with SEM, including localized chemical analysis Microfractography may simply be used to add weight to a macro scale determination of ductile...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006754
EISBN: 978-1-62708-295-2
... Microfractography may simply be used to add weight to a macroscale determination of ductile or brittle behavior. Evidence for distinguishing intergranular from cleavage fracture is most easily obtained by this method. Fine characteristics of ductile dimples can reveal additional information not available...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001071
EISBN: 978-1-62708-214-3
... of the valve and bolt hole 7. The fracture surface of the flange between bolt hole 7 and its outer rim (point C in Fig. 4 ) exhibited no sulfates. Fig. 8 Closeup view of fractured specimen from point A in Fig. 7 . Microfractography Examination of the fracture surfaces at low magnification...
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
... by microfractography has previously been noted to be 0.175″ deep by 0.165″ wide (0.44cm × 0.419cm). The critical stress intensity of the steel at the fracture origin site may then be calculated using the standard relationship (Eq 2) K 1 = σ 1 C π a where σ 1 is the principal normal stress...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003537
EISBN: 978-1-62708-180-1
... also be striking. Because of the early use of the TEM in microfractography, a substantial amount of fractographic images via TEM replicas have been published. In 1966, for example, Cedric Beachem published the results of an extensive study of fractographic features and interpretation at the Naval...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006814
EISBN: 978-1-62708-329-4
... to photographs of the fracture surface; macrofractography involves low magnification (<25×), while microfractography is at high magnification (>25×) ( Ref 1 ). Fractography is a valuable tool when performing failure analyses on welded connections, and macrofractrography is particularly useful. Perhaps...
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...