Grain boundary liquation
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... 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 …
Grain boundary liquation
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WebMar 14, 2016 · Research on the Grain Boundary Liquation Mechanism in Heat Affected Zones of Laser Forming Repaired K465 Nickel-Based Superalloy. Next Article in Special Issue. Reaction Behavior of Phosphorus in Coal-Based Reduction of an Oolitic Hematite Ore and Pre-Dephosphorization of Reduced Iron. WebSep 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
WebFeb 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, … WebMar 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 …
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 ... 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 …
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. …
WebDissolution of precipitates, grain boundary liquation, and phase transformations in the heat affected zone Dilution effects between base metal and filler metal Application … in a memo the last part normally indicatesWeb6、contraction Phase Transformation Mechanical Restraint Applied Loads Stress relieving HOT CRACKING(Solidification Cracking/Liquation Cracking)Cracking during solidification Low melting constituents Hot Cracking Susceptibility Index UCS=230C+190S+75P+45 Nb-12.3Si 4.5Mn 1 Cracking is low if UCS 30 Crac in a memory mapped i/o system each:WebAs shown in Figure3a, some blocky MC carbides exist in the grain boundary liquation film, and their shapes and sizes are similar to the initial carbides. At grain boundaries … in a memo the spacing of the body isWebFeb 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 … inactivity or state of motionless equilibriumWebJan 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. inactivity philippinesWebJan 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 … inactivity periodWebMar 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 … in a memo