Monocrystal high-temperature alloy directional solidification growth device and method controlled by multi-mode static magnetic field and application of monocrystal high-temperature alloy directional solidification growth device

Abstract

The invention discloses a single-crystal high-temperature alloy directional solidification growth device and method controlled by a multi-mode static magnetic field and application thereof. The single-crystal high-temperature alloy directional solidification growth device comprises a directional solidification system, a temperature control system and a magnetic field generator system, the directional solidification system comprises a growth cavity, a thermal insulation layer, a heating resistor, a crucible, a pull rod, a servo drawing system and a cooling system; the magnetic field generator system is located around a growth cavity of the directional solidification system, so that a single crystal growth interface of liquid metal to be solidified is located in a uniform or symmetrical magnetic field center area, and the intensity and configuration of a magnetic field applied by the magnetic field generator system are adjusted. The method is used for preparing the single-crystal high-temperature alloy including Ni-based, Co-based, Fe-based, Nb-based, TiAl-based and other metal single crystals, longitudinal and transverse component distribution in the single-crystal high-temperature alloy is controlled, and the microstructure and the precipitated phase of the single-crystal high-temperature alloy are changed, so that the high-temperature mechanical property of the single-crystal high-temperature alloy is improved, especially the instantaneous tensile strength and the creep durability are improved, and the service life of the single-crystal high-temperature alloy is prolonged. Therefore, the high-temperature mechanical property of the single-crystal high-temperature alloy is comprehensively

Description

technical field [0001] The invention relates to the field of material preparation and performance, and proposes a method and device for preparing directional / single crystal superalloys with excellent mechanical properties under a multi-mode static magnetic field, which is applied to the technical field of mechanical property control of various directional solidification / single crystal metal castings . Background technique [0002] Due to the elimination of grain boundaries, the single crystal superalloy has greatly improved its temperature resistance, so it has become the preferred material for the turbine blades of advanced aerospace and gas engines. The aeroengine F119 (US), GE90 (US) ), EJ200 (English, German, Italian, Spanish), M88-2 (French), P2000 (Russian), etc. all use single crystal alloy as the blade material. With the increase of the thrust-to-weight ratio of the engine, the temperature before the turbine is getting higher and higher, and the temperature before t...

AI Technical Summary

Problems solved by technology

These processes show their disadvantages when producing blades, especially in the production of large industrial gas turbine blades

For example, in the HRS method, the directional heat is conducted through the water-cooled copper plate at the bottom of the casting, and its cooling capacity is low, which will produce uneven structures, including coarse dendrites, severe micro-segregation, and even freckles and free crystals; the mold shell used is thick and uneven, which will also generate an uneven thermal field that leads to the formation of free crystals, and these defects seriously reduce the mechanical properties of the alloy

In order to improve the cooling capacity, people have developed the LMC method, but there is a huge risk of the coolant eroding the casting, and it also has an adverse effect on the mechanical properties. It has not been widely used in industry at present.

DWDS and ZMLMC methods are currently limited to small and relatively simple samples, and are still in the stage of laboratory development

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