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dislocation creep

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Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001816
EISBN: 978-1-62708-241-9
... by intergranular sliding of ferrite/ferrite and ferrite/pearlite, just as it occurs in stage III creep behavior. The behavior is confirmed through the Ashby-Verrall model, according to which the dislocation creep (power-law creep) and diffusion creep (linear-viscous creep) occur simultaneously...
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
.... On the atomic scale, dislocations are created and forced to move through the material. This leads to work hardening as the dislocation density increases and the dislocations encounter barriers to their motion. At low temperatures, an ever-diminishing creep rate results; however, if the temperature is...
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
... brief description of microstructural changes and damage from creep deformation. During creep, significant microstructural changes occur on all levels. For metals on the atomic scale, dislocations are created and forced to move through the material. This leads to work hardening as the dislocation...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.chem.c9001687
EISBN: 978-1-62708-220-4
... properties. Grain boundary sliding and dislocation motion were enhanced, causing a local increase in the steady state strain rate and the premature failure of the tube. Grain boundary sliding Plastic deformation Spalling Voids HK UNS J94224 Creep fracture/stress rupture The petrochemical...
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
... dislocation densities and/or stacking faults in a preferential manner. In conjunction with the slip-band graphitization, a general weakening of the mechanical properties of the tube and the onset of creep, which was observed at the outer diameter surface of the failure, caused the final failure of the tube...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.chem.c9001675
EISBN: 978-1-62708-220-4
... cracking. Figure 6 shows a typical edge pore caused by grain boundary sliding. This type of void is caused by dislocation creep and is only activated when the applied stress is relatively large. For the defect shown in Figure 7 , it is seen that in the images produced by the distribution of chromium and...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001004
EISBN: 978-1-62708-229-7
... propagation of microcracks are rate controlling while at high temperatures the nucleation and growth of creep cavitation, dislocation mobility and grain boundary sliding are important. Wilkinson et al ( 6 ) observed that the ductility of P-doped 1 1 4 Cr1Mo steels were higher than those without P...
Book Chapter

Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006790
EISBN: 978-1-62708-295-2
... fatigue, creep, or environmentally-assisted cracking. Corrosion and wear are another form of progressive material alteration or removal that can lead to failure or obsolescence. This article primarily covers the topic of abrasive wear failures, covering the general classification of wear. It also...
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
... Abstract This article provides an overview of fractography and explains how it is used in failure analysis. It reviews the basic types of fracture processes, namely, ductile, brittle, fatigue, and creep, principally in terms of fracture appearances, such as microstructure. The article also...
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
... (ductile, brittle, fatigue, and creep) are described briefly, principally in terms of fracture appearances. A description of the surface, structure, and behavior of each fracture process is also included. The article provides a framework from which a prospective analyst can begin to study the fracture of a...
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
... explains the failure of pressure vessels with emphasis on stress-corrosion cracking, hydrogen embrittlement, brittle and ductile fractures, creep and stress rupture, and fatigue with examples. brittle fracture composite creep rupture ductile fracture fabrication failure analysis fatigue...
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
... evaluations, the creep cavitation damage assessment, the oxide-scale-based life prediction, and high-temperature crack growth methods. coating evaluation creep cavitation damage assessment elevated-temperature failure gas turbine blade hardness testing high-temperature crack growth methods life...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006781
EISBN: 978-1-62708-295-2
... resulting from TMF loading are inelastic deformation, creep, microstructural evolution, and surface damage such as oxidation. Inelastic deformation occurs as a result of dislocation movement. What separates inelastic deformation from plastic deformation is that inelastic deformation is time-independent...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006787
EISBN: 978-1-62708-295-2
... mechanisms, such as galvanic corrosion, crevice corrosion, and pitting corrosion; creep; and fatigue. Impingement by solid particles can contribute to erosion-corrosion, or it can accelerate corrosion in the various gaseous and molten environments. Primary mechanisms include: Oxidation...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003546
EISBN: 978-1-62708-180-1
..., during straight and level flight, aircraft jet engines have essentially constant temperatures and imposed loads, where steady-state creep (and the environment) are the primary damage mechanisms. During takeoff and landing, however, the transient demand for more power output induces load and temperature...
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
... analyst is called upon to identify the origin of the fracture and the mechanism(s) of crack propagation. In general, the three general “modes” or types of metal fracture include failures from overload, fatigue, and creep. These three modes of fracture are briefly summarized in Table 1 , which includes...
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
... fracture (not all failures are fractures), the failure analyst must identify the origin of the fracture and the mechanism(s) of crack propagation. In general, the three general modes or types of metal fracture include failures from overload, fatigue, and creep. These three modes of fracture are briefly...
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
... are disruptions between the crystal lattice of individual grains, and this disruption provides a source of strengthening by pinning the movement of dislocations (so long as the temperature is not elevated into the creep range for significant dislocation climb). Thus, a finer-grain alloy imparts more...
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
... lattice of individual grains, and this disruption provides a source of strengthening by pinning the movement of dislocations (so long as the temperature is not elevated into the creep range for significant dislocation climb). Thus, a finer-grain alloy imparts more grain-boundary regions for improved...
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
... of these fractography concepts. At homologous temperatures low enough that creep deformation does not contribute to strain prior to or accompanying crack propagation ( T H < ~0.4 T M ), the mechanism of permanent deformation in metallic materials is by slip or deformation twinning. The...