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
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