The device is a complex synthetic body of energies, in which vaccum system, water - cooling system and autocontrol system of vaccum and temperature at a series of points are installed. The device can ue used for manufacturing blades with colum or single crystal structures at the velocity of solidification 10-~20 mm/min by comparison with the general directional solidification velosity of 2--4 mm/min.
Tensile tests show that the maximum tensile strength is 910 MPa,elongation 18.76%,which are equivalent to that of single crystal structure,much better than that of polycrystalline structure.
This technology can make the microstructure of material to be aligned exactly along with the preferential orientation and then can obtain unidirectional domains or single crystal, so the research, which is preparing high temperature superconductor with stronger anisotropism by the unidirectional solidification method, is being paid more attention.
An Al-1%Si bar with 8 mm in diameter and single crystal was made with self-made vacuum vertical continuous unidirectional casting equipment. The microstructure evolution and stability during continuous unidirectional solidification were studied.
In order to confirm the information obtained by those techniques, the X-ray single crystal structures of methyl 12-acetyldehydroabietate and methyl 12-(4-methoxycinnamoyl)-dehydroabietate were determined.
[NiL2](NO3)2 (1) and [NiL2](CF3CO2)2 (2) (L = N2-methyldiethylenetriamine] have been synthesized and their X-ray single crystal structures have been determined.
In this paper the directional solidification process of blades in gas turbine engine of former Sovit Union and the special device used for the process are described. The device is a complex synthetic body of energies, in which vaccum system, water - cooling system and autocontrol system of vaccum and temperature at a series of points are installed. The device can ue used for manufacturing blades with colum or single crystal structures at the velocity of solidification 10-~20 mm/min by comparison with the ge...
The relationship between Ni_3Al single crystal structures with Boron contents of 0, 0.52, 1.37, 2.22 and 3.00 at % and their mechanical properties at room and high temperatre is studied in this paper. It shows that as the Boron content grows, the tensile strength and yield strength of Ni_3Al single crystal at room temperature and 800℃ increase continuously. The maximums are obtained at contents of 1.37 and 0.52at % B respectively. If the Boron content continue to grow, boride eutectic will separate out from...
The microstructure and high temperature stress rupture properties of a nickel-base single crystal superalloy NASAIR100 cast in both high and low thermal gradients have ben investigated comparatively. It was found that the high thermal gradient casting enhanced reductions in dendrite arm spacing and in the amount of casting porosity. The high thermal gradient cast single crystals possessed finer,more regular γ′Precipitates and less γ/γ′cutectic. With the same withdrawal rate, the high thermal gradient castin...