WebAninvestigationintocrackinginnickel,basesuperalloyrepairweldsM,T,Rush,1,a,P,A,Colegrove1,b,Z,Zhang2,candB,Courtot1,1Weld,凡人图书馆stdlibrary.com 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 ...
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http://files.aws.org/wj/supplement/01-2004-DAVE-s.pdf Webgrain boundary penetration. The other alloy cores exhibited only moderate wet ting of the grain boundaries. A typical example of the penetration observed in 6951 and 6061 is shown in Fig. 2. In contrast, the limited penetration ob served in 3003 is shown in Fig. 3. Figure 2 shows that as penetration occurs, the grain size increases with each fmovies en streaming
Migration of solidification grain boundaries and prediction
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 discovered that grain boundaries are considerably serrated in the absence of γ ′-phase or M 23 C 6 at the grain boundaries. An electron energy-loss spectroscopy study ... WebMar 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. WebFeb 1, 2024 · [4] Qian M and Lippold J C 2003 The effect of annealing twin-generated special grain boundaries on HAZ liquation cracking of nickel-based superalloys Acta Mater. 51 3351-61. Google Scholar [5] Qian M and Lippold J C 2003 The effect of rejuvenation heat treatments on the repair weldability of wrought alloy 718 Mater. Sci. … greensheet fort worth