Directionally solidified grains

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August undefined, 2024

WebDec 28, 2024 · Directionally solidified sample rings deformed in torsion to large angles also exhibit pole figures that were difficult to interpret, … 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.

Microstructure characteristics of the directionally solidified TiAl …

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 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 ... how to know what shoe size i am

High temperature mechanical properties and strain

WebAbstract — In this paper the evolution of grain structure and the control of crystal orientation in gas turbine blades are presented. The conditions leading to the solidification of … 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 … WebThe alloys were directionally solidified by utilizing Bridgeman casting process and followed by appropriate post heat treatment. The microstructure and high temperature creep properties of the prepared alloys were then characterized. ... During creep test, cracks initiate and grow mainly at the MC type carbide within grains or the M 23 C 6 type ... how to know what shoes to resell

Investigation on freckle formation and evolution of single-crystal ...

Effects of Solidification Conditions on Grain Refinement Capacity …

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 … WebIn directionally solidified blades the [001] crystallographic orientation is the preferred orientation along the blade principal axis. Addition of hafnium combats grain boundary … how to know what size bike tube to buyWebJun 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. how to know what side to shade when graphing

"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. " - Directionally solidified grains

Directionally solidified grains

Effects of hafnium additions on the solidification behavior of ...

WebDec 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 … 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 …

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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 … 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 … 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.

WebFor 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. WebA 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...

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 ...

Webcastings and directionally solidified ingots of the Ni-22Al-0.5B and Ni-24Al-0.5B alloys. A decrease of the volume fraction of the γ’ + γ phase area in the matrix of the Ni-24Al-0.5B alloy is ... how to know what shampoo to use how to know what size a pc fan is in mmWebMar 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. josé saramago written works 9WebMar 14, 2024 · In Bridgman method, directional solidification is governed mainly by heat transfer under a thermal gradient rather than by mass transport. In general, there are three typical types of microstructures that can be obtained through solidification: equiaxed, directionally solidified (columnar), and single crystal. [ 4] jose saucedo tyler texasWebDec 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 … how to know what size blinds to buyWebnon-destructive testing systems and methods专利检索，non-destructive testing systems and methods属于 ...内部结构如缺陷粒度纹理专利检索，找专利汇即可免费查询专利， ...内部结构如缺陷粒度纹理专利汇是一家知识产权数据服务商，提供专利分析，专利查询，专利检索等数据服务功能。 how to know what size bike to buy kidsWebJun 15, 2004 · Grain structure. Directional solidification. 1. Introduction. The development of single crystal technology over the past two decades for the production of … joses ashland mo