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mixed fracture morphology

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Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001128
EISBN: 978-1-62708-214-3
... fracture mixed with cavities. These fracture morphologies were similar to those of an actual steam pipe. It was concluded that creep crack growth behavior was the prime failure mechanism of seam-welded steam pipes. Selected Reference Selected Reference • Creep and Stress Rupture Failures...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.matlhand.c0089338
EISBN: 978-1-62708-224-2
... microscope (SEM) examination of the fracture surfaces revealed woody overload features, typical for resulfurized steels. The morphology was identified as a mixed fracture mode of cleavage and ductile rupture, and the directionality of the features was suggestive of shear overload. A typical region...
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
... of pearlite and bull's-eye ferrite, typical for this material, whereas the near-surface exhibited mixed graphite morphology. Many transgranular, secondary cracks were apparent next to the fracture surface. No carbides were observed. Fig. 1 Failure of a ductile iron cone-crusher frame. (a) Near-surface...
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
... represent cleavage “flakes”. Cross-hatched area around flake 1 is overload fracture in same original cast grain as underlying flake. Stippled areas of flakes 2 and 3 are mixed mode. Location of closed crack is also indicated. Fig. 3 SEM macrograph of area of flakes 2 (upper) and 3 (lower), showing...
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
... review of the potential root cause. Weld repairs Worm gears Manganese bronze Mixed-mode fracture A very large diameter worm gear that had been in service in a dam for more than 60 years exhibited cracks and was removed. It was reported that the cast bronze gear was only rarely stressed...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001815
EISBN: 978-1-62708-241-9
... 500× Fig. 7 Typical coarse transverse grain structure of a good stock pin. Original magnification 50× Fig. 3 Representative service-failure fracture surface, showing reflective, granular appearance Fig. 4 Typical mixed intergranular, microvoid dimple morphology...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001753
EISBN: 978-1-62708-241-9
... the component represent low-energy paths for crack propagation. SEM of the primary fracture surfaces revealed characteristics of two types of fracture morphologies, intergranular fracture and transgranular microvoid coalescence, indicative of a mixed mode [ 6 ]. Intergranular cracking and cleaved...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001846
EISBN: 978-1-62708-241-9
... sleeve Fig. 2 Fractured main shaft showing fracture position and surface hardness (HRC) on various journals Fig. 3 Surface damage morphology of main shaft ( a ) showing serious circumferential wear marks and ( b ) showing serious peel pits Fig. 4 Macromorphology...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001362
EISBN: 978-1-62708-215-0
... the bottoms of corrosion pits. The cracking morphology is mixed mode, that is, both intergranular (around grain) and transgranular (through grain). The photomicrograph in Fig. 6(a) shows two immediately adjacent cracks exhibiting different crack morphologies. The disc surfaces and primary crack paths show...
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
... subjected to torsion and tensile loading to cause kinking. This failure morphology is characterized by a mix of compression damage and classic torsional failure, shown in Fig. 15 . In this example, a flat, ductile torsional fracture surface is obser ved, consistent with torsional overload. However, cracks...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c9001685
EISBN: 978-1-62708-235-8
... strain rates and high hydrogen content are characterized by a brittle topography with a mixed mode of predominantly quasi-cleavage and isolated pockets of microvoid coalescence. The fracture path appears to favor propagation along the martensitic platelets. Fracture morphologies of material with low...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001787
EISBN: 978-1-62708-241-9
... Fig. 1 The macromorphology of the drilling bit ( a ) the fracture surface; ( b ) the beach mark; ( c ) the crack of the tooth profile Fig. 2 SEM morphology of the spline: ( a ) A; ( b ) B; ( c ) C; ( d ) D; ( e ) area D-detail Fig. 3 SEM morphology of the area C...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001379
EISBN: 978-1-62708-215-0
...× Fig. 4 EDS spectrum of Zone 1 Fig. 5 Mixed intergranular and ductile dimpled morphology of Zone 2. 1000× Fig. 6 SEM of the interface of Zone 3 (top) and Zone 4 (shear). 500× Fig. 2 Fractograph representing a fracture half of one of the failed bolts. 5× Fig. 7...
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
... at the machined radius, which contained corrosion pits, as shown in Fig. 5 . Many of the thumbnail cracks initiated from corrosion pits. The morphology within the thumbnail crack was different than the surrounding fracture surface. The failure mode within this region was intergranular, with some evidence...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.auto.c9001678
EISBN: 978-1-62708-218-1
... at the transition point, the shank first thread. The cracking mechanism was intergranular at the origin ( Fig. 9a ), became mixed mode cleavage with dimples ( Fig. 9b ), and ultimately changed to shear. Thus the fracture surface of the bolt C had a mixture of cleavage, macrovoid coalescence and intergranular...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001819
EISBN: 978-1-62708-180-1
... contained few precipitates, but lines of primary inclusions were randomly distributed ( Fig. 8d ). The fracture surface exhibited a mixed fracture mode with intermingled dimples and fatigue striations ( Fig. 8e ). The pins did not exhibit any corrosion. This example demonstrates how the different...
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
... As shown in several of the previous examples, it is not unusual to observe fractographic evidence of multiple mechanisms on a single fracture surface. The failure analyst must rely on experience to interpret mixed-mechanism and mixed-mode features. The morphology at the fracture origin is of primary...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.bldgs.c9001715
EISBN: 978-1-62708-219-8
... Abstract Microstructure, corrosion, and fracture morphologies of prestressed steel wires that failed in service on concrete siphons at the Central Arizona Project (CAP) are discussed. The CAP conveys water for municipal, industrial, and agricultural use through a system of canals, tunnels...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001762
EISBN: 978-1-62708-241-9
... a microscope. The pre-existing crack morphology was intergranular fracture in the axles studied. An estimate of the force required to cause the axle fracture can be made using the measured crack size, fracture toughness determined from these tests, and linear elastic fracture mechanics. The axle can...
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
... rely on experience to interpret mixed-mechanism and mixed-mode features. The morphology at the fracture origin is of primary importance. Atypical features among uniform fracture features may not be of significance other than pinpointing microstructural inhomogeneities and discontinuities (see...