Grain boundary liquation
WebMar 15, 2016 · The damaged K465 nickel-based superalloy parts were repaired by laser forming repair technology. The cracking characteristics and grain boundary liquation in heat affected zones were investigated by optical microscopy (OM), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). It was found that the … WebThe mechanism of serrated grain boundary formation and its effect on liquation behaviour have been studied in a wrought nickel-based superalloy – Alloy 263. It was newly …
Grain boundary liquation
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WebThe mechanism for HAZ (heat-affected zone) liquation of alloy 617B during gas tungsten arc welding (GTAW) was investigated. Welding thermal simulation work was conducted to investigate the effects of thermal parameters (peak temperature, holding time, and thermal cycle numbers) on M23C6 carbides’ evolutionary behavior in nickel-based alloy … WebJan 8, 1999 · Grain boundary liquation was observed to occur only in certain segments of the same grain boundary. The boundary is divided into several parts due to its intersection with twin boundaries. A twin boundary, TW1, intersects the grain boundary at point a, which would modify its character.
WebMar 15, 2016 · The calculation by Thermol-Cale software showed that the larger γ' particles at grain boundaries partly dissolved in the γ phase, which made the solutes' … WebJan 7, 1999 · Intergranular microfissuring is frequently observed in the weld heat-affected zones (HAZ) in Inconel 718. Extensive studies of this phenomenon have established that the HAZ microfissuring in Inconel 718 is associated with the constitutional liquation of grain boundary (GB) precipitates of carbides, Laves and {delta} phases. In addition, HAZ …
Web2、anfield.ac.uk*,bp.colegrovecranfield.ac.uk,cz.zhang.ircbham.ac.uk*Corresponding authorKeywords:Liquation cracking,Nickel Superalloy welds,Laser welding,Cold Metal Transfer,CMT,Strain age cracking,Rene 80AbstractThe nickel-base superalloy Rene 80 is considered very susceptible to liquation and strain WebMar 15, 2016 · The liquation of γ′ and γ phases with the smaller sizes, which distribute at the grain boundaries, occurs near the bottom of RZ, where the temperature is higher …
WebThe grain size of a UNCD film determines the sp 2 and hydrogen content. It follows that smaller grains result in higher grain-boundary (GB) areas, which in turn leads to higher …
The phenomenon of grain boundary liquation can be amplified by the segregation of manganese, sulfur, copper, and some other elements to the austenitic grain boundaries. Both phosphorus and sulfur markedly affect the steel overheating temperatures, increasing steel’s tendency for a crack initiation. See more A heat treater had a run-off of an induction hardening machine on a Friday evening. All components that had been induction hardened were … See more Induction scan-hardening is one of the most popular techniques to strengthen steel components. An increased popularity of scan-hardening is associated with several distinguished … See more Stresses are prime causes of cracking. It is imperative to have a clear understanding regarding nature and causes of stresses while discussing a subject of cracking in … See more Another example of an impact of very common geometrical irregularities on results of heat treatment would be a scan hardening of stepped shafts consisting of multiple diameter … See more china riots todayWebMar 5, 1998 · In the thermally cycled material many grain boundaries were observed to liquate; however, the liquation was heterogeneously distributed, that is, only some grain … china ripped jeans supplierWebNov 12, 2024 · Figure 6 shows the formation of grain boundary liquation and liquation cracks in HAZ. As can be seen, most of the mentioned phases have contributed to the … china rip offshttp://files.aws.org/wj/supplement/01-2004-DAVE-s.pdf grammarly for windows 7WebMar 5, 1998 · Therefore, it is concluded that the extent of B segregation, to which liquation of grain boundaries in the H AZ during welding has been attributed, is greater on random boundaries owing to their ability to accommodate a large number of B atoms in comparison with the low Σ boundaries leading to their liquation during Gleeble simulation. grammarly for windows 7 downloadWebJul 6, 2024 · The liquation at grain boundaries is also likely through constitutional liquation induced by Nb-rich carbides (Ref 25, 26). In thermal cycle of multipass laser … china rise ins. broker ltdWebThe mechanism for HAZ (heat-affected zone) liquation of alloy 617B during gas tungsten arc welding (GTAW) was investigated. Welding thermal simulation work was conducted … grammarly for windows 10 word