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graphite morphology

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Image
Published: 01 June 2019
Fig. 1 Optical micrograph showing mostly nodular graphite morphology in the shell region of roll sample HSM #14; magnification 100× More
Image
Published: 01 June 2019
Fig. 2 Optical micrograph showing typical flake graphite morphology in the shell region of roll sample HSM #4; magnification 100× More
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.conag.c0090965
EISBN: 978-1-62708-221-1
... spheroidal graphite morphology at the frame surface. Cone crushers Frames Graphitic structure 80-55-06 UNS F33800 Brittle fracture The upper frame from a large cone crusher failed in severe service after an unspecified service duration. The ductile iron casting was identified as grade 80-55...
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
... stands of a HSM. The study pertains to an integrated steel plant under the Steel Authority of India Limited, where large variations in HSM work roll life were observed even under similar mill operating environment. The paper discusses microstructural aspects such as graphite morphology and content...
Image
Published: 01 June 2019
Fig. 1 Failure of a ductile iron cone-crusher frame. (a) Near-surface microstructure of the frame showing degenerate graphite morphology rather than the intended nodular structure evident in the core. Unetched. 30×. (b) The typical frame microstructure also exhibits high levels of ferrite More
Image
Published: 01 January 2002
Fig. 18 Failure of a ductile iron cone-crusher frame ( example 7 ). (a) Near-surface microstructure of the frame showing degenerate graphite morphology rather than the intended nodular structure evident in the core. Unetched. 30×. (b) The typical frame microstructure also exhibits high levels More
Image
Published: 15 January 2021
Fig. 14 Failure of a ductile iron cone-crusher frame (Example 7). (a) Near-surface microstructure of the frame showing degenerate graphite morphology rather than the intended nodular structure evident in the core. Unetched. Original magnification: 30×. (b) The typical frame microstructure also More
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.conag.c0090938
EISBN: 978-1-62708-221-1
... at a stiffening rib exhibited brittle features. (c) Longitudinal metallographic cross section showing secondary brittle cracking along the graphite flakes. 2% nital etch. 59× Tensile specimens from both halves exhibited ultimate tensile strengths exceeding 205 MPa (30 ksi). Although testing of samples...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.matlhand.c0047312
EISBN: 978-1-62708-224-2
... the presence of graphite nodules, indicating the probability that the component was manufactured from a ductile cast iron. The fractured surface also exhibited the presence of a dark region toward the center, suggesting the possibility of a shrinkage defect. The estimated area of this defect was approximately...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006778
EISBN: 978-1-62708-295-2
... ( Fig. 1a , b ). Parabolic or elongated shear dimples occur from torsional loading ( Fig. 1c ) or from mode II (in-plane) shear. However, metallic materials can behave in a ductile manner but not exhibit the classical dimple-rupture morphology, as shown in Fig. 1(d) for a cast aluminum alloy...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001337
EISBN: 978-1-62708-215-0
... cracking and creep void formation at the fissure. A nearly continuous band of graphite nodules was observed on the surface of the fissure. In addition to the graphite band formation, the microstructure near the failure exhibited carbide spheroidization from long-term overheating in all the tube regions...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003543
EISBN: 978-1-62708-180-1
... manner, but not exhibit the classical dimple-rupture morphology, as shown in Fig. 1(d) for a cast aluminum alloy. The cast aluminum alloy fracture surface should show dimples in the aluminum matrix (original dendrites), but can be difficult to see because fracture surface morphology is impacted...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001050
EISBN: 978-1-62708-214-3
... Diagram depicting ultrasonic inspection of the shell and location of the indication. Surface Examination Visual The fracture surfaces observed at the mill indicated a brittle fracture. The fracture pattern and the fracture surface morphology indicated the initiation point to be at the edge...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001711
EISBN: 978-1-62708-229-7
... to overheating: it does not exhibits any “fishmouth” or “cobra” appearance. Fig. 1 10CrMo9-10 steel after 125,000 service hours. Neither is it due to graphitization of hydrogen damage, in which case a “brittle” or “window” fracture should be observed. The morphology of the fracture is shown...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001802
EISBN: 978-1-62708-241-9
... modes and morphologies are generally consistent with those of ductile metals, such as austenitic stainless steel, with one exception: Nitinol exhibits a unique damage mechanism under high bending strain, where damage occurs at the compression side of tight bends or kinks while the tensile side...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.conag.c9001633
EISBN: 978-1-62708-221-1
... analysis. Optical metallography was performed on polished and etched (5% nital) samples from the failed wheel hub. Similar samples were used for microhardness measurements. Results and Discussion The microstructure of the wheel hub was spheroidal graphite dispersed in a ferrite metal matrix...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006869
EISBN: 978-1-62708-395-9
... is affected by filler percentages by weight, morphology, and distribution ( Ref 58 , 59 ). The impact of graphite fillers on glass–epoxy composites has been examined. Amelioration of wear behavior was reported due to the formation of a thin, coherent, uniform film over counterface parts, which act...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006932
EISBN: 978-1-62708-395-9
... on properties of plastics. It explains the use of high-modulus graphite fibers in amorphous polymers. high-modulus graphite fibers plastics thermal diffusivity thermal expansion thermal stress ENGINEERING PLASTICS, as a general class of materials, are prone to the development of internal stresses...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.chem.c9001718
EISBN: 978-1-62708-220-4
... regions. (8.8×) A closer view of the dark portion of the fracture surface reveals the Widmanstätten structure ( Figure 10 ). This fracture morphology suggests that the cracks formed during solidification of the casting. The site of these defects, the ends of the blades where material thickness...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003508
EISBN: 978-1-62708-180-1
... causing a localized seam Oxide inclusion or skins, seams G 143 (a) Folded films of graphitic luster in the wall of the casting Lustrous carbon films, or kish tracks G 144 Hard inclusions in permanent molded and die cast aluminum alloys Hard spots (a) Defects that under some...