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boundary sliding

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Published: 01 June 2019
Fig. 2 Showing creep damage in the pipe in the form of grain boundary sliding and cracking. Unetched. More
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...
Image
Published: 01 June 2019
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. More
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
... removal of the 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...
Image
Published: 01 June 2019
Fig. 7 Details of cracking shown in Figure 5 with the SEM (unetched). The damage was produced by grain boundary sliding in alternate directions following reversal of the local stress. Figures 7e and 7f show, respectively, the distribution of chromium and nickel in the area of 7d . More
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
... 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 formation need to be addressed. One possible solution to the tendency for creep...
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
... 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) Introduction A material...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006806
EISBN: 978-1-62708-329-4
... (chemical-bonded boundary lubricant, lamellar solid lubricant) or lubricated with available moisture or applied lubricant. Fig. 2 Configurations of various sliding bearings The bearings meant for more severe duty must be designed and fabricated more precisely, and they more likely require...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c9001188
EISBN: 978-1-62708-235-8
... Abstract A short fracture section of a forged and normalized Ck 35 (DIN 17200) steel slide showed three distinct zones: a dark colored crystalline area, an incipient crack propagating into a far advanced, rubbed fracture surface, and a fine crystalline final break. Metallographic examination...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006911
EISBN: 978-1-62708-395-9
... from boundary sliding on asperity contacts to fully sliding on fluid films can be described using the Stribeck curve ( Fig. 4 ), which displays how increasing fluid film thickness ratio λ affects the friction coefficient μ . The fluid film thickness ratio is the ratio of fluid film thickness...
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
... is to adopt a suitable lubrication, if possible. If the Λ-factor is high (typically in excess of 1), wear is negligible, because the asperities do not touch each other during sliding. In boundary lubrication, adhesion wear takes place but is 1 to 3 orders of magnitude less than in the corresponding dry...
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
...) fracture, viz., in low temperature 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...
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
... Abstract Examination of several fighter aircraft main landing gear legs revealed unusual cracking in the hard chromium plating that covered the sliding section of the inner strut. The cracking was associated with cracks in the 35 NCD 16 steel beneath the plating. A detailed investigation...
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
... of creep may manifest as grain-boundary movement or sliding, dislocation glide, dislocation glide plus climb, and/or the diffusion of chemical species within the lattice. The rate equation that governs most forms of crystalline creep may be simplified to the following functional form ( Ref 2 ): (Eq 2...
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
... enough, dislocations rearrange and annihilate through recovery events. On a more macroscopic scale, creep deformation also produces microstructural changes, such as slip bands, grain-boundary sliding, cavity formation and growth, and cracking (grain boundary, interphase boundary, and transgranular...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006794
EISBN: 978-1-62708-295-2
... Corrosive wear can occur in different forms, depending on the wearing condition. A few typical forms of corrosive wear encountered in industry are discussed here. Abrasion-Corrosion This form of deterioration is the material removal caused by sliding of a harder, rough counterface across the target...
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
... the grain-boundary sliding Grain-boundary carbides (in polycrystalline materials) to reduce the creep rate by inhibiting grain-boundary sliding The way in which cracking occurs could be envisioned as oxidation of a grain boundary at high temperatures and cracking by slip-band impingement at low...
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
... from the dry case. Thus, a boundary-lubricated, normal-impact contact is essentially quasi-dry. Wear is, therefore, not likely to be reduced with lubrication of a normal contact. In a lubricated compound-impact contact, due to the tendency for a full film to form, a superimposed sliding speed...