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particle growth

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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c0047140
EISBN: 978-1-62708-234-1
... and evenly distributed throughout the structure. Instead, the grains were totally surrounded with brittle carbide particles. This facilitated the formation of a crack at a fillet in the keyway. Crack growth was rapid once the crack had initiated. ...
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
... of inclusions and often second-phase particles and constituents as well as grain boundaries, all of which impact the fracture nucleation and growth process. Fig. 1 Single-crystal chisel point. Source: Ref 1 Early work using metallic materials of low symmetry (rhombohedral bismuth, hexagonal...
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
... and often second-phase particles and constituents as well as grain boundaries, all of which affect the fracture nucleation and growth process. Fig. 1 Single-crystal chisel point. Source: Ref 19 Early work using metallic materials of low symmetry (rhombohedral bismuth; hexagonal close-packed...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003517
EISBN: 978-1-62708-180-1
... the structures in these two areas, the degree of service aging can be identified. The diameter of the particles should be measured to determine the amount of particle growth that has occurred. In alloys with duplex gamma-prime microstructures...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c0089256
EISBN: 978-1-62708-235-8
...Abstract Abstract Alloy steel forgings used as structural members of a ski chair lift grip mechanism were identified to have contained forging laps (i.e., sharp-notched discontinuities) during an annual magnetic particle inspection of all chair lift grip structural members at a mountain resort...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001111
EISBN: 978-1-62708-214-3
... in.) wide flange and arrested 100 mm (4 in.) down the slant web. Failure analysis revealed a major deficiency in fracture toughness. The failure occurred as a brittle fracture after the formation of a welding hot crack and approximately 40 mm (1 1 2 in.) of slow crack growth. It was recommended...
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
... of embrittling metal atoms. Thus, the extent of crack growth by SMIE from external sources of embrittling metals such as coatings is limited (usually less than several millimeters) [ 19 ], and failures by SMIE are rare. On the other hand, when closely spaced, internal embrittling particles are present...
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
.... An overview of a systematic approach, analyzing the nature of degeneration and failure of the failed components, utilizing conventional metallurgical techniques, is presented. The topographical features of the turbine blade fracture surface revealed a fatigue-induced crack growth pattern, where crack...
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
... on fracture path Effects on fracture mechanics properties Phase morphology in α-β titanium alloys Change from α and β grains to α in β Crack branching and irregularity greatly increased Higher K Ic and K Issc Increased resistance to fatigue crack growth Large particles in steels...
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
.... Apparently, few of these are nucleated by second-phase particles. It should be noted that this specimen is relatively thin, and that, for the high Δ K involved, fatigue growth is under plane-stress conditions. This contributes to the shear dimples noted in Fig. 6(b) . At much lower Δ K values at both low...
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
... ). With transmission electron microsopy (TEM) replicas, the microscopic growth process in Fig. 6(b) was shown to be elongated shear dimples. Apparently, few of these are nucleated by second-phase particles. It should be noted that this specimen is relatively thin, and that, for the high Δ K involved, fatigue growth...
Book Chapter

Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003544
EISBN: 978-1-62708-180-1
... growth of crack, and the sudden fracture of the remaining cross section. The article discusses the effects of loading and stress distribution on fatigue cracks, and reviews the fatigue behavior of materials when subjected to different loading conditions such as bending and loading. The article examines...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.steel.c0046998
EISBN: 978-1-62708-232-7
... boundaries (light-etching constituent) and a few scattered small gray particles of sulfide and black particles of silicate. The third micrograph of specimen 1 in Fig. 1 shows a carburized coarse-grain (ASTM 000 to 3) structure at a depth of approximately 1.5 mm (0.060 in.), the midpoint of the wall...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001848
EISBN: 978-1-62708-241-9
... [ 4 ]. This phenomenon is followed by further subsurface crack growth which spreads to the surface and leads to the detachment of particles from the surface [ 2 , 5 ]. In this analysis, a failed hot forging die was investigated with the aim at identification of different failure modes...
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
... of the forging process. The suspected cause was uneven flow of material during the forging process, which resulted in stagnant areas where grain growth occurred. Microscopic examination of the parts revealed large grain areas near the parting line. The rest of the forging showed a uniform grain structure...
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
... provides clues as to whether the material is high strength (smoother) or low strength (rougher) and whether fracture occurred as a result of cyclic loading. The surfaces from fatigue crack growth are typically smoother than monotonic overload fracture areas. The monotonic overload fracture of a high...
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
... should ideally include the assessment of the whole component life, with the conditions for crack initiation, cyclic crack growth, and final fracture. It must be distinguished between an infinite-life design, where the number of cycles is not important, and a finite-life design, in which the cycles up...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.marine.c9001621
EISBN: 978-1-62708-227-3
..., the long-range cyclic stresses (for example, bending in a shaft) are enough to cause continued fatigue crack growth. In a small number of cases, however, the long-range stresses in the body of the component are insufficient to cause continued propagation. 4 In those cases, the result is shallow...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c0089734
EISBN: 978-1-62708-235-8
...-particle testing, radiographic inspection, and 2% nital etched 1.7x views) showed varying IDs on the assemblies and supported the conclusions that the failures of the butt welds were the result of fatigue cracks caused by cyclic thermal stresses that initiated at stress-concentrating notches at the toes...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001028
EISBN: 978-1-62708-214-3
... growth in the lower zone was upward and outward, indicated by the thumbnails on both ends of the fracture surface ( Fig. 7 ). Mode III fatigue crack growth was evidenced by secondary cracks on the fracture surface ( Fig. 8b ). Detailed examination of the fracture surface showed fatigue features produced...