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Grain boundary sliding

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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
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.chem.c9001736
EISBN: 978-1-62708-220-4
... mechanism, namely grain boundary sliding, relating to the periodic nature of the loading, with high residual stresses being present. Grain boundary sliding Petrochemical equipment Transfer piping Welded joints 316 UNS S31600 Creep fracture/stress rupture Leakage was detected at the welds...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001011
EISBN: 978-1-62708-229-7
... transfer zone of the coil. It showed that many damage mechanisms may combine in the transition from fracture initiation to final failure. The presence of grain boundary sliding as an indication of creep damage was useful in the characterization of the stress level as high and showed that the process of...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001291
EISBN: 978-1-62708-215-0
... from the intergranular crack tips.2% nital etch. Sections through the cracking revealed intergranular cracks penetrating approximately 0.13 mm (0.005 in.) into the steel, along the prior-austenite grain boundaries. Most of these cracks were associated with cracking in the chromium plating; some...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006791
EISBN: 978-1-62708-295-2
... adhesive sliding contact has been discussed using a two-dimensional coarse-grained numerical simulation ( Ref 23 ). These simulations revealed the existence of a critical length scale that controls the formation of the particles during the adhesive interaction between surface asperities. Only asperity...
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
... and T > 0.4 T m in alloys, where T m is the material melting temperature. Note then that the magnitude of the elevated temperature that initiates creep is relative to the material of interest. The damage mechanisms of creep may manifest as grain-boundary movement or sliding, dislocation...
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
... RTE fracture, initiation and 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...
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
.... structural components superplastic deformation boundary sliding dislocation creep high-strength low alloy steel decohesions traction testing grain size elongation Ti-Nb microalloyed ultrafine-grained steel (UGS steel, general) high-strength low-alloy steel (HSLA steel, general) A...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.steel.c9001598
EISBN: 978-1-62708-232-7
.... For this reason and to minimize the possibility of creep, the aerospace industry uses single crystal turbine blades. Obtaining a single crystal in the drain tube is highly unlikely. Therefore, the high temperature weaknesses of the grain boundaries and the tendency of grain boundary sliding and void...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006789
EISBN: 978-1-62708-295-2
... experimental relationship between Φ and material hardness of various alloys (up to ~1000 HV) by means of a pin abrasion test and employing abrasive papers with SiC grains with three different average diameters (i.e., three different attack angles, approximately 15, 10, and 5°). The researchers determined that...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003563
EISBN: 978-1-62708-180-1
... ) only begin to understand the underpinning failure mechanisms of PVD coatings, as discussed subsequently for TiN and DLC coatings. The structure of TiN coating deposited by various PVD processes is generally columnar with some evidence of equiaxial grains near the interface ( Ref 50 , 51...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001801
EISBN: 978-1-62708-241-9
... section of Rod “B”; surface is rough, but no apparent cracks Fig. 17 Surface morphology of SEM sample holder The fractured surface morphology for both rods was shown in Figs. 10 and 11 ; both samples revealed grain boundary fractures, akin to grain boundary decohesion. The general...
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
... external cracks by grinding. Fig. 6 Details (three views at increasing magnification) of remnant external cracks adjacent to the repair weld (unetched material). The grain boundary creep pore was formed by grain boundary sliding. Fig. 7 Details of cracking shown in Figure 5 with the...
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
... and are also referred to as triple-point or grain-corner cracks in the literature. Wedge-type cracks form at triple points due to grain-boundary sliding and can be promoted by decohesion at interfaces between grain-boundary precipitates and the matrix. High stresses and lower temperatures promote...
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
...′ precipitates to provide strength Large grains to reduce the intrinsic creep rate by reducing the grain-boundary area and therefore the grain-boundary sliding Grain-boundary carbides (in polycrystalline materials) to reduce the creep rate by inhibiting grain-boundary sliding The way in which...
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
...; however, if the temperature is sufficiently high, dislocations rearrange and annihilate through recovery events. Creep deformation also produces microstructural changes, such as slip bands, grain-boundary sliding, cavity formation and growth, and cracking (grain boundary, interphase boundary, and...
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
... temperatures is a consequence of TG microscopic deformation by slip and/or twinning in the crystalline lattice and, at higher homologous temperatures (for example, T H ~ 0.4), by slip and viscous grain-boundary flow. If other events do not intervene, continued plastic deformation by slip at T H < 0.4...
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
... fractography features Mark/Indication Implication Dimpled fracture surface Ductile overload fracture at this location Faceted fracture surface Brittle cleavage fracture Possible SCC fracture May be low Δ K fatigue Intergranular with smooth grain boundaries Likely either...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003565
EISBN: 978-1-62708-180-1
... effect on the wear mechanism and material removal rate during the repetitive impact of ceramics (see Fig. 16 ) ( Ref 32 ). In dry conditions, as described in the previous section, extensive fracture and growth of cracks is promoted along grain boundaries. In humid conditions, however, fracture only...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003507
EISBN: 978-1-62708-180-1
... Possible defects Electroplating Hydrogen embrittlement, galvanic corrosion Heat treatment Excessive grain growth, burning of grain boundaries, brittle structure, carburization, decarburization, quench cracks Electrolytic cleaning Pitting Surface hardening, nitriding, carburizing, anodic...