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grain facets

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Image
Published: 01 January 2002
Fig. 9 Corrosion products on the grain facets from SCC of a U-700 turbine blade, presumably from combustion-gas attack that induced SCC, with IG and transgranular modes shown More
Image
Published: 15 January 2021
Fig. 9 Corrosion products on the grain facets from stress-corrosion cracking (SCC) of a U-700 turbine blade, presumably from combustion-gas attack that induced SCC, with intergranular and transgranular modes shown More
Image
Published: 01 December 1992
Fig. 1 SEM fractograph of the fractured face of the bellows, showing grain facets and secondary microcracks. 150×. More
Image
Published: 01 December 2019
Fig. 3 SEM micrograph shows grain facets (boundary surfaces) at fatigue crack initiation site of failed crankshaft LF5. Facets A and B are on the same grain. 300× More
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c9001734
EISBN: 978-1-62708-234-1
... during melting. Microscopic examination of polished, etched section through the fractured surface verified intergranular separation and breakdown of grain facets. The absence of any reduction of thickness on the bracket assembly at the point of fracture, along with evidence of intense heat at this point...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c0045918
EISBN: 978-1-62708-235-8
... Abstract Cracks, with no other damage, were observed in a niobium alloy (Nb-106) part when it was pulled from several months of protective storage for assembly into a rocket nozzle. SEM views showed the cracks to be intergranular, with contaminant particles on a large number of the grain facets...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.machtools.c9001519
EISBN: 978-1-62708-223-5
..., followed by failure of the collet, which shattered one of its arms when it struck the work table. Scanning electron microscopy showed the presence of hairline crack indications along grain facets on the fracture surface of the bolt. This, coupled with stepwise cracking in the material, generally raised...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001839
EISBN: 978-1-62708-241-9
... surfaces revealed a brittle intercrystalline mode of fracture with typical manifestations of clear grain facets. Branched and discrete stepwise microcracks were also found along with unusually high levels of residual hydrogen. Mechanical tests revealed a marked loss of tensile ductility in the defective...
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
... with the work table. SEM fractography and metallographic examinations conducted on the bolt revealed hairline indications along grain facets on the fracture surface and stepwise cracking in the material, both indicating failure by hydrogen embrittlement. Similar draw-in bolts were discarded and replaced...
Image
Published: 01 December 1993
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 overload). 1215×. (b) SEM fractograph of a field taken More
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001752
EISBN: 978-1-62708-241-9
... the low sulfur steel crankshaft contained planar dimpled facets along separated grain boundaries with a small spherical manganese sulfide precipitates within each dimple. In contrast, planar dimpled facets along separated grain boundaries of impact fractures from the ultra-low sulfur crankshaft steel...
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Published: 01 December 2019
Fig. 2 SEM fractographs of steel fracture surface showing brittle, intercrystalline fracture with clear grain facets resembling “rock candy” appearance More
Image
Published: 01 June 2019
Fig. 1 Combined SEM/AES analysis of failed niobium alloy rocket-nozzle component. (a) Intergranular-fracture surface with contaminant particles on grain facets. (b) AES spectra of contaminated fracture surface More
Image
Published: 01 June 2019
Fig. 2 Fracture surface of draw-in bolt (top) exhibits “oyster shell” marks, which may be caused by abrupt changes in load level. SEM photomicrograph (bottom, 2000×) of area near the threads on the fracture surface shows hairline cracks along the grain facets. These are often associated More
Image
Published: 01 January 2002
of “rock candy” intergranular fracture, such as those in (b), might be missed. This raises the question of whether corrosion-generated hydrogen caused local embrittlement. The separated-grain facets in (b) show no trace of corrosion. Both at 350× More
Image
Published: 01 June 2019
Fig. 6 Fatigue striations on the facets of tantalum grains. More
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
... appearance, characteristic of intergranular cracking ( Fig. 3 ). The size of the individual facets indicated a large grain size (0.5 mm or 0.02 in. or more), and suggested that the cracking was the result of high temperature at some point during the processing. Moreover, the highly equiaxed appearance...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.marine.c0091036
EISBN: 978-1-62708-227-3
..., and micropores on the grain facets. The chemical composition of a failed screw was consistent with grade 4037 alloy steel and satisfied the fastener specification. Tension testing of two exemplar screws revealed failure strengths that exceeded the minimum requirement and fracture features consisting...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001555
EISBN: 978-1-62708-217-4
... shear lip zone. The presence of micropores in the cleavage facets as well as at the grain boundaries and hairline type crack indications under SEM examination were all suggestive of hydrogen embrittlement. On the basis of investigation results and observations, it was concluded that the transverse...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003540
EISBN: 978-1-62708-180-1
... a faceted “rock candy” fracture surface ( Fig. 2a ), which may be visible at low magnification (hand lens) if the grain size is coarse. In some cases, however, the intergranular features may not be as obvious. For example, intergranular fractures may have a relatively smooth, featureless fracture surface...