Directionally solidified grains
WebOct 15, 2024 · The directional solidification process was carried out by a conventional high-rate-solidification (HRS) Bridgman technique. A spiral grain selection method was employed to obtain single-crystal specimens. Wax patterns were assembled into a wax cluster with one side facing the central sprue ( Fig. 1(c)). WebThe thermal field and the grain structure of a cored superalloy turbine blade, which has been directionally solidified with the liquid metal cooling (LMC) process, has been simulated in three dimensions using a cellular automaton …
Directionally solidified grains
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Web@article{osti_7128245, title = {Effects of hafnium additions on the solidification behavior of directionally solidified superalloys. Final report, 1 June 1975-31 August 1977}, author = {Brody, H D and Giamei, A F}, abstractNote = {A cooperative university/industry research program into the effect of hafnium additions on the solidification behavior of nickel base … WebJun 1, 2011 · The coarse lamellar grain with the lamellar orientation parallel to the growth direction, which was produced in the upper part of the directionally solidified ingot in the single DS process, was employed as a seed to control the lamellar orientation.
WebJan 26, 2024 · Directional solidification is a technology making grains grow along required direction during solidification to form columnar grains with a specific crystal orientation. Relative to other alloys, the application of directional solidification technology to Mg alloys is still in the exploratory stage. WebJun 15, 2004 · Grain structure. Directional solidification. 1. Introduction. The development of single crystal technology over the past two decades for the production of …
WebApr 9, 2024 · Generally, the microstructural features of eutectic ceramics exist on three different size scales that can be readily distinguished in alumina-based nanoeutectic ceramics based on the nucleation-growth process of eutectic phase microstructure, grain structure and colony structure, as do directionally solidified eutectic ceramics . Other ... WebMay 9, 2024 · When the grain refiner is added during directional solidification, directionally solidified microstructure changes from an anisotropic columnar crystal to an isotropic equiaxed crystal, because the equiaxed grains can nucleate from the refiner at the site where the columnar grains normally appear. [ 3]
WebApr 18, 2024 · Directionally solidified single crystal superalloy test bars were prepared by the spiral grain selection method. The microstructural evolution and orientation characteristics of the starter block and spiral part were studied, and the influence of the competitive growth of crystals on the microstructural characteristics was analyzed.
Webdirectionally solidified (DS) and single crystal (SX) cast components. This paper will discuss the ... SEM photo micrographs of grain boundary carbide microstructures following heat treatment show fine discrete carbides, which are key to obtaining good alloy strength and ductility (Figure 5) [12]. cengaver cfgWebFeb 25, 2024 · Two different directionally solidified casting geometries were used: a step casting (5.1 cm × 22.9 cm × 7.6 cm) and a turbine blade (of comparable size to the step … cengar green oil safety data sheetbuy home in hamilton ontarioWebJun 6, 2024 · In this study, the effects of solidification conditions on the grain refinement capacity of heterogeneous nuclei TiC in directionally solidified Ti6Al4V alloy were investigated using experimental and numerical approaches. Ti6Al4V powder with and without TiC particles in a Ti6Al4V sheath was melted and directionally solidified at … ceng application examplesWebMar 1, 2024 · [0026]In some embodiments, optionally, a directionally solidified or single crystal seed starter may be fastened to the build plate 340 to promote directionally solidified grains in the desired vertical/longitudinal direction. In an embodiment, a seed crystal is provided having at least a predetermined primary orientation. ceng classWebA directionally solidified industrial gas turbine engine blade (10) is produced by a process including the steps of cold working and zone heat treating the tip portion (12) of the airfoil of... buy home in hemlock miWebFor the Ti68Al32 alloy droplets, the solidified microstructures are composed of alpha(2)-Ti3Al phase, when the droplet diameters (D) are ranging from 226 to 1100 mu m. With the decrease of droplet diameters, the microstructural characteristics of alpha(2) phase transform from coarse dendrites to the fully equiaxed grains. ceng ceng bali