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microstructural damage

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Published: 30 August 2021
Fig. 16 Microstructural evolution during high-temperature creep damage. (a) Initial ferrite plus pearlite. (b) In situ spheroidized carbide. (c) Grain-boundary carbides. (d) Creep voids. Original magnification: 200× More
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c0046414
EISBN: 978-1-62708-234-1
... quantities of air were being drawn into the system when water in the supply tank dropped below a certain level. It was concluded that cavitation erosion (due to the uptake of air) caused metal removal and microstructural damage in the impellers. Recommendations included adding a water-level control...
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Published: 01 June 2019
Fig. 6 Microstructure of the core in the annealed region of a damaged wire. Etched in alc. picric acid, 500 × More
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Published: 01 June 2019
Fig. 4 Microstructure of the damaged area, reformed austenite and martensite. Microhardness 924 HV. 400 × More
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Published: 01 December 2019
Fig. 8 Microstructure of damaged sleeve plate showing precipitation of metal carbides at grain boundaries, 400× More
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Published: 01 December 2019
Fig. 9 Microstructure of damaged sleeve showing severe oxidation of metal plate at the edge, 100× More
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Published: 01 December 2019
Fig. 10 Microstructure of damaged sample showing grain coarsening, 100× More
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Published: 01 December 2019
Fig. 11 Microstructure of damaged sleeve showing intergranular cracks, 200× More
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.chem.c9001736
EISBN: 978-1-62708-220-4
... stress creep damage showing up as damage centers or voids, and the microstructural damage observed was in the form of grain boundary sliding and resulting microcracks, ahead of and adjacent to the main cracks. Figure 2 shows a representative view of the pipe material outside of the heat affected zone...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c9001547
EISBN: 978-1-62708-225-9
... springs are susceptible to premature failure, the metallurgical condition of the material was examined. The only abnormalities found were a roughened surface of the wire and a concentration of microstructural damage at the base of the end hooks. Surface roughness varied along the circumference...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001669
EISBN: 978-1-62708-229-7
... the profile of the cracking at the leak site and to ascertain whether cracking was present in other parts of the weld. Finally, where surface indications were found, metallographic replicas [ 1 ] were made to permit examination of the microstructure for evidence of creep-related damage. Information...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006807
EISBN: 978-1-62708-329-4
... to a synergistic effect. These include thermally activated microstructural changes or aging that occurs in metallic materials in the same temperature range where creep is a concern. This article is aimed at providing an overview of the damage mechanisms of concern, with a focus on creep, and the methodologies...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003545
EISBN: 978-1-62708-180-1
... Abstract This article reviews the applied aspects of creep and stress-rupture failures. It discusses the microstructural changes and bulk mechanical behavior of classical and nonclassical creep behavior. The article provides a description of microstructural changes and damage from creep...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001757
EISBN: 978-1-62708-241-9
..., which can greatly increase strain on the part at the damaged section. As a result from the abnormal back-and-forth bending, material microstructure may be altered around the applicable damaged area. This alteration is often termed work hardening [ 7 ]. Fig. 10 The result of hardness test...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001739
EISBN: 978-1-62708-215-0
... Macrographs showing a cross section through the bulge after a hydrochloric macroetch. The dark areas denote hydrogen damage. A closeup view of the bulge is shown in (b). Metallography Microstructural Analysis A cross section through the bulge area was prepared for metallographic evaluation...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006780
EISBN: 978-1-62708-295-2
.... The article also reviews various factors related to creep behavior and associated failures of materials used in high-temperature applications. The complex effects of creep-fatigue interaction, microstructural changes during classical creep, and nondestructive creep damage assessment of metallic materials...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001092
EISBN: 978-1-62708-214-3
... that intersected undamaged, burnished, and surface-spalled zones revealed no anomalies in the chemistry, microstructure, or hardness that could have caused the damage. The physical evidence suggested that the operable mechanism was contact fatigue caused by misalignment of the shaft in the assembly. Contact...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001277
EISBN: 978-1-62708-215-0
... Abstract Waterwall tube failure samples removed from a coal- and oil-fired boiler in service for 12 years exhibited localized underdeposit corrosion and hydrogen damage. EDS and XRD revealed that bulk internal deposits collected from the tubes contained metallic copper which can accelerate...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.machtools.c9001229
EISBN: 978-1-62708-223-5
..., there was indeed a difference between the damaged saw blade and the one designated as satisfactory: the first mentioned showed a sickle-shaped zone with an altered microstructure under the back of the teeth. It was made visible in Fig. 1 by etching the surface with Nital, while it was absent in the satisfactory...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001331
EISBN: 978-1-62708-215-0
... that indicate hydrogen damage are a window fracture, little or no bulging of the pipe wall, the presence of a thick internal scale consisting of Fe 3 O 4 and other oxides, and the presence of fissures in the carbide (pearlite) zones of the microstructure. The thick internal deposit is the most damaging...