1-20 of 42 Search Results for

decohesions

Follow your search
Access your saved searches in your account

Would you like to receive an alert when new items match your search?
Close Modal
Sort by
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001816
EISBN: 978-1-62708-241-9
... Abstract This paper describes the superplastic characteristics of shipbuilding steel deformed at 800 °C and a strain rate less than 0.001/s. After the superplastic deformation, the steel presents mixed fractures: by decohesion of the hard (pearlite and carbides) and ductile (ferrite) phases and...
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
... crack origins which assumed a “thumbnail” shape and displayed surface morphologies which resulted from intergranular decohesion. Many of the crack sites initiated from corrosion pits. Energy dispersive spectroscope performed on areas within the crack initiation site showed the presence of chlorides. The...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001383
EISBN: 978-1-62708-215-0
... either a fatigue mechanism or ductile overload failure. SEM analysis revealed that the mode of fracture was intergranular decohesion, which indicates an environmental influence in the fracture mechanism. The primary fracture initiated at a thread root and propagated by environmentally-assisted slow crack...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c0089254
EISBN: 978-1-62708-225-9
... the wedge-shaped middle rings fractured prior to having been fully torqued, preventing the sprocket from being locked to the shaft. “Woody” fracture features, as a result of decohesion between a high volume fractions of manganese sulfide stringers and the matrix, was revealed during examination. The...
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
... Abstract Stainless steel pipe (273-mm OD x 8-mm wall thickness) used in the fabrication of large manifolds developed crack-like decohesions during a routine inductive bending procedure. The imperfections, which were found near the outside diameter, were around 3 mm in length oriented in the...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.bldgs.c0090943
EISBN: 978-1-62708-219-8
... imperfections or repair welds. Fig. 1 Overload failure of a bronze worm gear. (a) An opened crack is shown with a repair weld, a remaining casting flaw, and cracking in the base metal. (b) Electron image of decohesive rupture in the fine-grain weld metal. Scanning electron micrograph. 119×. (c) Morphology...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001837
EISBN: 978-1-62708-241-9
... grained HAZ (magnification 200×) Fig. 9 Optical micrographs of capping face of cracked specimen showing ( a ) weld zone, ( b ) HAZ, ( c ) base metal, ( d ) CGHAZ and ( e ) intergranular cracks in CGHAZ and ( f ) intergranular cracks and grain boundary decohesion in CGHAZ (magnification 200...
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
... corrosion cracking steels INTERGRANULAR FRACTURE is the decohesion that may occur along a weakened grain boundary. Typically, the grain boundaries in polycrystalline materials are stronger than individual grains in a properly processed material below its creep-regime temperature. The grain boundaries...
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
... cracking steam generator tubes INTERGRANULAR FRACTURE is decohesion that occurs along a grain boundary. Intergranular fracture is often associated with the presence of an embrittlement mechanism or the presence of precipitates and segregates at the grain boundary, which make the grain boundary the...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001107
EISBN: 978-1-62708-214-3
... transformations promote decohesion of metal particles and graphite, and gross metal wastage (dusting) occurs. Fig. 6 Reactivity of sever air representative alloys reacted in Co. Once this mechanism was initiated, reaction rates probably accelerated when carbon diffused into the area of fine grain size...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.marine.c9001141
EISBN: 978-1-62708-227-3
... the fracture on the shear wall is seen to be primarily micro-void coalescence which is evidence of plastic deformation. Fig. 14 Vertical shear step joining two terraces. Figure 15 shows the decohesion and separation along the inclusion/metal interface and the initiation of shear between...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.chem.c9001534
EISBN: 978-1-62708-220-4
... propagated in a brittle manner. In the crack initiation zone, cracking was intergranular. This region also exhibited blisters around inclusions. Microcracks emanating from inclusion sites and decohesion of inclusion/matrix interfaces were also noticed. These features are characteristic of hydrogen...
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
... morphology found on approximately 90% of the total fracture surface. The mode of fracture was intergranular decohesion, indicative of a brittle fracture. No evidence of fatigue striations were observed, but since these features are difficult to resolve in such high-strength materials, fatigue could not he...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001294
EISBN: 978-1-62708-215-0
... dislodged grain. 570×. (b) Sensitized grain boundaries result in grain boundary decohesion. 1140× Optical photographs and SEM micrographs of the unwelded AM-355 poppet show a uniform appearance with martensitic structure ( Fig. 5 and 6 ). This structure is very different than that of the failed...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.chem.c9001687
EISBN: 978-1-62708-220-4
... matrix have become weaker, enhancing the formation of voids by precipitate-matrix decohesion. Inter-dendritic type of fracture was also detected at the outer region of the tube and shows a large number of micro-cracks at the fracture surfaces ( Fig. 5 ). These findings indicate that a progressive...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001031
EISBN: 978-1-62708-214-3
... separation at elevated temperatures. Grain-boundary decohesion occurred as oxides formed at grain boundaries, reducing interfacial energy ( Ref 5 , 6 ). The failure mode changed from ductile transgranular to brittle intergranular. Void formation was enhanced in the presence of grain-boundary precipitates...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001801
EISBN: 978-1-62708-241-9
... morphology of SEM sample holder The fractured surface morphology for both rods was shown in Figs. 10 and 11 ; both samples revealed grain boundary fractures, akin to grain boundary decohesion. The general surface morphology in the straight regions of the rods was shown in Figs. 12 and 13...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001812
EISBN: 978-1-62708-241-9
... LME results from adsorption-induced weakening of interatomic bonds at surfaces and crack tips, which facilitates dislocationemission or decohesion. There are, however, a few systems, such as the Al–Ga and Ni–Bi couples [ 15 , 16 ], where the embrittling atoms diffuse rapidly along grain boundaries...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.steel.c9001532
EISBN: 978-1-62708-232-7
... greater detail. The general fracture topography of all spalled rolls showed brittle features. Figure 6(a) shows the SEM photograph of the fracture surface of roll sample HSM #9 at 1000× magnification. The fracture topography is brittle and shows the decohesion of a graphite nodule. The fracture surface...
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
... hydrogen essentially facilitates the formation of an intergranular microcrack that initiates brittle fracture. This type of brittle cracking is a stress-controlled intergranular decohesion phenomenon [ 10 ]. Based on the investigation, it is inferred that the incidence of delayed catastrophic cracking...