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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
... tension 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...
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
... of the fracture 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...
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
... to fracture, 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...
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
... of the grain facets. EDX analysis showed they consisted of niobium and fluorine. Plastic replicas, prepared by standard TEM techniques, were analyzed with selected-area electron diffraction, showing a pattern match for niobium tetrafluoride. Auger analyses showed electron spectra containing peaks representing...
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...
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...
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
... angular 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 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
... in the region which undergoes the most deformation during forging. Moreover, the cracks exhibited rounded large intergranular facets associated with localized melting at the grain boundaries. Throughout the shoulder regions there were solidification shrinkage cavities and MnS inclusions. The latter showed...
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
...Common grain-boundary embrittlers Table 1 Common grain-boundary embrittlers Group Elements IVa Si, Ge, Sn Va P, As, Sb VIa S, Se, Te Fig. 9 Corrosion products on the grain facets from SCC of a U-700 turbine blade, presumably from combustion-gas attack...
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 transgranular dimple-rupture features, whereas the core morphology consisted primarily of dimple-rupture features. Figure 1(c) shows some of the intergranular features, which also contain secondary grain-boundary separation, ductile hairlines, and micropores on the grain facets. The chemical composition...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006777
EISBN: 978-1-62708-295-2
... resolution of ductile intergranular fatigue striations 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 Abstract Abstract...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001105
EISBN: 978-1-62708-214-3
... was revealed, confirming stress-corrosion cracking (SCC) as the failure mechanism ( Fig. 1 ). Fig. 1 SEM fractograph of the fractured face of the bellows, showing grain facets and secondary microcracks. 150×. Examination of a cross section from the threaded tie rod revealed a microstructure...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001377
EISBN: 978-1-62708-215-0
...× Crack Origins/Paths The intergranular cracking originated at the surface is typical of several types of brittle fracture mechanisms. However, in Fig. 7 and 8 , the presence of corrosion products on grain facets and networks of intergranular secondary cracking (appearing as black folds at grain...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.marine.c9001657
EISBN: 978-1-62708-227-3
... or intergranular [ 11 , 12 ]. Faceted intergranular crack nucleation generally contains a grain boundary at the far end of the facet [ 13 ], and a boundary of this nature was not observed in the present investigation, Figure 5 . It is therefore concluded that the crack initiation in the Alloy 713LC blade occurred...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001371
EISBN: 978-1-62708-215-0
... of the outside machined cylindrical surface at the origin area on samples A and B revealed evidence of pitting, cracking, and intergranular attack ( Fig. 5 , respectively). A higher-magnification view of the intergranular attack ( Fig. 5 ) shows corrosion product on the exposed grain facets. The initial attack...
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
... of soluble salts containing certain specific anions can inhibit the crack-producing effect of a given environment on a given alloy. Certain aspects of the metallurgical structure of an alloy (such as grain size, crystal structure, and number of phases) influence the susceptibility of the alloy to SCC...
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
... grain size, as deduced from the apparent cleavage facet size, was very large. When examined at high magnifications in an SEM, the fracture surface looked somewhat like an intergranular fracture, with a much smaller grain size. The intergranular appearance was unusual, in that it did not have...
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
... the presence of a second phase when they occur truly in the grain boundary. However, it not uncommon to see very small dimples on grain boundary facets. Dimpled intergranular fracture can occur from void formation in the grain boundaries or from the mechanism of microvoid coalescence in the region adjacent...
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
...) the grain boundaries may be related to various types of IG mechanisms (which may be diffusion-related processes such as creep void formation, hydrogen void formation, or impurity segregation in the grain boundaries). Sometimes the facets of IG fracture are almost featureless, perhaps containing only...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003554
EISBN: 978-1-62708-180-1
... amount of aluminum dissolves in the mercury and oxidizes at the mercury-air interface. Solid metal induced embrittlement fractures of most commercial metals and alloys are classically intergranular. Near the final fracture area, the grain facets are usually smooth and the grain edges sharply defined...