Grain boundary liquation
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 WebGrain boundary liquid films form in the subsolidus portion of the heat-affected zone (HAZ) as a consequence of constitutional liquation. Rapid cooling limits the extent of solute diffusion into the matrix from the grain boundary liquid and hence extends its solidification temperature range.
Grain boundary liquation
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WebOct 7, 2024 · Solidification grain boundary migration (SGBM) occurs in metals and alloys manufactured by casting, welding, or 3D printing, and it affects material properties, but its … WebAfter 1 hour at 1200°C, there were no signs of grain boundary liquation in either the A286 or the A286 plus boron steel At 1250°C the steel containing boron showed signs of eutectic liquation. At 1500°C theeutectic boride had increased in quantity and the A286 steel had alsocommenced to liquate.
WebJul 1, 1992 · The U.S. Department of Energy's Office of Scientific and Technical Information WebThe lineal fraction of grain boundary liquation was evaluated by the following relationship through measure- ment of the total grain boundary length (ΣL g ) and the total liq- uefied length...
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 WebThe stability of the grain boundary precipitate dispersion was examined in order to determine the susceptibility of the grain boundary microstructure to liquation. These latter experiments were facilitated by a large, "static" grain structure, and this study may mark the first time that any grain boundary particle dispersion has been fully ...
WebNov 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 …
WebFeb 1, 2024 · The grain boundary segregation decreases and the threshold tensile stress of solid-liquid interfacial decohesion across the intergranular liquid film simultaneously … great eastern san franciscoWebNov 1, 2024 · In PMZ 1, liquated grain boundaries result from a reaction between particles dispersed at the grain boundary with the matrix (Fig. 12 a). Our previous studies [9, 17] … great eastern santragachiWebMar 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. great eastern saving plan 2022WebJan 1, 2009 · intermetallics, or grain boundary segregated regions melt, with (usually) an expansion accompanying the phase change from solid to liquid. This is y 3% for many metals, but closer to 6% for Al... great eastern scene painting companyWebFeb 1, 2009 · Grain boundary (GB) liquation and the attendant cracking has been observed during welding of a variety of alloys, such as nickel–base superalloys, … great eastern saving plan 2023WebFeb 3, 2024 · 2.21.2.3.2.1 Overview. Grain-boundary sliding has been widely invoked as a plausible mechanism for the ubiquitous transition from elastic through anelastic to … great eastern san francisco caWebSep 15, 2024 · The as-received powder batch exhibits mostly a spherical morphology with some satellites. The powder characteristics are summarised as follows: D50 = 75 μm, a powder bed density of 53.6% and a flow time of 16.0 ± 0.1 s for 50 g of powders going through a 2.54 mm diameter orifice (Hall flowmeter). 2.2. Selective electron beam melting great eastern serampore