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Directionally solidified grains

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] WebDirectionally solidified (DS) and single-crystal (SX) superalloys and process technology are contributing to significant advances in turbine engine efficiency and durability. These gains are expected to arise from the development of higher creep strength and improved oxidation-resistant SX alloy compositions as well as from the development of ...

Effects of Solidification Conditions on Grain Refinement

WebFeb 1, 1970 · Directional Solidification to Produce Columnar Grain and Single Crystal Structures. 700540. Something exciting has been happening during these last several … WebJun 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 … sharma seating system https://hj-socks.com

Thermal and grain-structure simulation in a land-based turbine …

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)). 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. WebJan 5, 2024 · Furthermore, the main focus in the directional solidification is the control over the grain boundaries in a way that promote the growth of dendrites along the longitudinal direction. Certainly, the optimum properties are attained when the proper volume fraction of γ ′ phase and carbide precipitates are formed during heat treatment. sharmar village senior care community

Lamellar orientation control in a Ti–46Al–5Nb alloy by directional ...

Category:Directional solidification - Wikipedia

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Directionally solidified grains

Lamellar orientation control in a Ti–46Al–5Nb alloy by directional ...

WebDec 15, 2015 · The effect of a transverse magnetic field on the growth of equiaxed grains during directional solidification of Al-10 wt% Cu alloys was investigated experimentally and numerically, and the obtained results are summarized as follows: 1.

Directionally solidified grains

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WebJun 1, 2008 · The BC samples with diameter 12 mm were directionally solidified into a tin bath for a height of 50 mm at a withdrawal speed of 1.67 × 10 −5 m s −1 (i.e. 1 mm min … WebJan 31, 2024 · Ni-Al-Mo based alloys can be used as materials for high temperature applications. They can be prepared by various techniques such as an electron beam zone melting, which allows us to obtain the alloys with a directionally solidified structure and unique properties. A plasma-melted Ni-Mo master alloy was used for the preparation of …

WebFeb 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 … WebDirectionally solidified (DS) GTD-111 is a Ni-base superalloy designed to withstand creep damage occurring in the first and second stage blades of gas-powered turbines. The …

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. WebAug 2, 2024 · Verissimo et al. studied that the dendritic growth of directionally solidified Mg–Zn alloys and observed the equiaxed grains along the entire directionally solidified samples, while dendritic structures with side branches were obtained for directionally solidified Mg–Zn alloy as the cooling rate range from 0.05 to 9.00 K/s . Due to the ...

WebMay 27, 2024 · The optimal solidification parameters were as follows: the growth rate ( V) ranged from 10 to 25 μm/s, and temperature gradient ( G) ranged from 10 to 20 K/mm. DS Ti-49Al (at%) alloy with paralleled lamellar orientation was successfully prepared according to the predication solidification parameters.

WebMay 16, 2024 · The macrostructure of directionally solidified Al-7Si alloy without and with AECP in the longitudinal section is shown in Figure 4. Without AECP, the lower part of the ingot presents the upward columnar grains and the upper fourth of … population of lithuania 2021 todayWebDec 23, 2016 · In directionally solidified materials the solidification starts from the outer surface (called chilled zone) and proceeds toward the centre of the casting. Because of … population of liverpool city regionWebFeb 5, 2024 · In this study, a typical directionally solidified nickel-based superalloy, IC10 alloy, was employed as the substrate. IC10 alloy is strengthened by precipitating the … population of livonia michiganWebDec 1, 2024 · In this work, directional solidification tests of the GTD-111 Ni-based superalloy were conducted at different withdrawal velocities of 3, 6 and 9 mm.min-1 … population of livonia township mnWebJun 6, 2024 · In this study, the effects of solidification conditions on the grain refinement capacity of TiC in directionally solidified Ti6Al4V alloy were investigated. In addition, … sharmas illingworthWebWhole grains are side dish champions, happy to be tossed in a cool vinaigrette or treated to a hearty stir in a risotto-like preparation. Bulk up vegetable soups with a handful of filling … sharma skin \\u0026 hair surgeryWebApr 9, 2024 · From the point of view of processing, in situ oxide eutectic composites are often produced, as in metallic systems, with directional solidification of eutectic melts: for … sharma seattle