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Lamellar tearing

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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c0089793
EISBN: 978-1-62708-235-8
... main crack had propagated parallel to the fusion boundary along the subcritical HAZ and was associated with long stringers of type II manganese sulfide (MnS) inclusions. This supported the conclusion that the weld failed by lamellar tearing as a result of the high rotational strain induced at the root...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.conag.c9001442
EISBN: 978-1-62708-221-1
... through the fillet welds and zone showed lamellar tearing, which confirmed that failure had occurred in weld metal adjacent to the fusion face of the fillet to the vane. Results of the investigation indicated that the primary cause of failure of the impeller was the development of fatigue cracks from the...
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
... examination of sections cut from the cracked area identified lamellar tearing as the principle cause of the cracking. This was surprising in 6 mm thick hull plates. Corrosion fatigue and general corrosion also contributed to hull plate perforation. Although it is probable that more lamellar tears exist near...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.conag.c9001139
EISBN: 978-1-62708-221-1
... of the failure include the use of bolts in lieu of welding, a welding schedule that reduces the propensity of lamellar tearing, and the use of an alloy that precludes lamellar tearing. However, if abuse of the crane was the primary cause of failure, none of these recommendations would have prevented...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.chem.c0048840
EISBN: 978-1-62708-220-4
...-stress levels after welding. Lamellar tearing Pressure vessels Strain aging Welded joints ASTM A201 Grade B Joining-related failures Brittle fracture A spherical carbon steel fixed-catalyst bed reactor failed after 20 years of service while in a standby condition ( Fig. 1 ). At the time...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c9001446
EISBN: 978-1-62708-234-1
... slightly angled thereto. The problem of lamellar tearing beneath heavy fillet welds at “T” junctions is also related to the presence of internal laminations and stringers in the material, but is outside the scope of the present article. The second case relates to the failure by cracking of a cylinder...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.conag.c9001588
EISBN: 978-1-62708-221-1
... the low ductility direction of the transition joint plate, lamellar tearing of plate material occurred at the boxed I-beam fillet weld attachment. Brittle fracture of this joint precipitated global collapse of the truss structure. Bridges (structures) Ore conveyors Structural steel Brittle...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c9001258
EISBN: 978-1-62708-235-8
... sides of the fracture of 300 mm each. Missing in the lamellar surface structure, with the exception of the remnants of a coarse network, were the pre-eutectically precipitated carbides to be expected in this steel. Surrounding the ferritic region in the surface structure, a ring of lamellar pearlite is...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003509
EISBN: 978-1-62708-180-1
... heat input of the process are not addressed in detail. Planar imperfections are sharp cracklike features that can substantially reduce the fatigue strength of a welded joint or cause initiation of brittle fractures. Examples include hydrogen cracks, lamellar tears, lack of fusion, reheat cracks...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.marine.c9001445
EISBN: 978-1-62708-227-3
..., their orientation as well as their size requires to be very carefully considered before the vessels concerned are approved for service, particularly if the defects do not lie completely parallel to the surface, but are slightly angled thereto. The problem of lamellar tearing beneath heavy fillet welds...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001270
EISBN: 978-1-62708-215-0
... and a heat-treated part. The samples were mounted and polished. The microstructure—lamellar pearlite and ferrite—was typical of the medium-carbon steel used for the product. The grain size near the parting line of the forging was larger than the grain size in the surrounding area. This indicated that...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001818
EISBN: 978-1-62708-180-1
... drum. Field examination occurred 2 days after the fracture. The fracture surfaces between nozzles 1 and 2 and through the manway (access port) in the head were classic brittle fractures. The remainder of the fracture involved tearing, and the crack led off from parallel to the axis of the...
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
... caused by internal tension and restraints to contraction (cracks and tears) C 210: Cold cracking or tearing C 211 (a) Discontinuities with squared edges in areas susceptible to tensile stresses during cooling; surface not oxidized Cold tearing C 220: Hot cracking and tearing...
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
... via mixed brittle and ductile mechanism overload fracture is shown in Fig. 8 . The crack stopped in this area where deformation and necking of the ductile bull’s-eye ferrite is evident. Much of the remaining cracking through the lamellar pearlite was very brittle. Although the ferrite phase was not...
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
... mechanism overload fracture is shown in Fig. 8 . The crack stopped in this area where deformation and necking of the ductile bull's-eye ferrite is evident. Much of the remaining cracking through the lamellar pearlite was very brittle. Although the ferrite phase was not predominant in the matrix...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001710
EISBN: 978-1-62708-229-7
... intergrannular corrosion sometimes described as lamellar, layer, or stratified corrosion. 3 Attack generally occurs at the boundaries of grains elongated in the rolling direction, typical of rolled and extruded aluminum alloys. In this type of corrosion, attack proceeds along selected subsurface paths parallel...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001391
EISBN: 978-1-62708-215-0
... detail schematic, indicating chip construction as having both a top and bottom termination. Actual construction and sales literature indicated only a top land termination. The edge termination has a wraparound configuration. Dimensions given in inches The terminations were of a lamellar design...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003538
EISBN: 978-1-62708-180-1
... is evidence of plastic deformation and failure by microvoid coalescence (MVC) ductile tearing. However, exceptions to this fracture progression mode have been reported. One is formation of a specimen-scale shear band (sometimes associated with void sheet formation at the microscale). One set of...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006775
EISBN: 978-1-62708-295-2
... microscale, there is evidence of plastic deformation and failure by microvoid coalescence (MVC) ductile tearing. However, exceptions to this fracture progression mode have been reported. One is formation of a specimen-scale shear band (sometimes associated with void sheet formation at the microscale). One...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006779
EISBN: 978-1-62708-295-2
...         = C · ( Δ σ π · a / Q · M ) m · Δ N The acceleration of fatigue crack-growth rates that determines the transition from region 2 to region 3 is caused by the superposition of a brittle or a ductile tearing mechanism onto the mechanism of cyclic subcritical crack...