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Substrate-triggered directional solidification of single crystal superalloys

A high-temperature alloy, directional solidification technology, applied in the direction of single crystal growth, single crystal growth, self-solidification method, etc., to achieve the effect of eliminating excessive deviation angle, simplifying process flow and improving production efficiency

Active Publication Date: 2021-01-22
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this method avoids the formation of miscellaneous crystals in the remelting zone of the seed crystal to a certain extent, it still cannot avoid the complicated process of repeated treatment and assembly of the seed crystal

Method used

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  • Substrate-triggered directional solidification of single crystal superalloys
  • Substrate-triggered directional solidification of single crystal superalloys
  • Substrate-triggered directional solidification of single crystal superalloys

Examples

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Embodiment

[0036]In this example, DD5 superalloy is used to prepare a certain type of single crystal turbine blade, the main alloying elements of which are C (0.040-0.060), Cr (6.75-7.25), Co (7.00-8.00), W (4.75-5.25), Al (6.00~6.40), Ta(6.30~6.70), Mo(1.30~1.70), Hf(0.12~0.18), B(0.003~0.005), Re(2.75~3.25), and the rest are nickel.

[0037] The specific implementation steps are as follows:

[0038] (1) Preparation of single crystal substrate materials matching the crystallographic characteristics of single crystal superalloys

[0039] In this embodiment, DD5 alloy is selected as the single crystal substrate material: (a) Since both the single crystal superalloy and the single crystal substrate material use DD5 alloy, the lattices between the two are completely matched, and the lattice mismatch degree is ≤7.8%; (b) The crystal plane of DD5 single crystal base material in contact with the superalloy melt is (001), which belongs to the low-index crystal plane of the face-centered cubic ...

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Abstract

The invention relates to a base-triggered single crystal superalloy directional solidification process, comprising the following steps: (1) preparing a single crystal base material matching the crystallographic characteristics of the single crystal superalloy; (2) preparing a single crystal base material using the obtained single crystal base material Single crystal substrate chilling plate; (3) applying the obtained single crystal substrate chilling plate to directional solidification equipment for smelting and directional solidification of superalloys, that is, preparing single crystal superalloy products. Compared with the crystal selection method and the seed crystal + crystal selection method, on the basis of precisely controlling the orientation of the single crystal superalloy, the present invention reduces the overall height of the casting by eliminating the spiral crystal selector, thereby achieving enhanced axial heat dissipation and improved mushy The purpose of temperature gradient in the zone and the elimination of freckles and stray crystals near the edge plate. The successful implementation of the invention can not only greatly improve the preparation quality and success rate of the blade, but also reduce the preparation cost of the single crystal superalloy blade.

Description

technical field [0001] The invention belongs to the field of single crystal superalloy preparation, and in particular relates to a base-triggered single crystal superalloy directional solidification process. Background technique [0002] Since the disappearance of grain boundaries can not only eliminate the potential crack initiation points in the alloy, but also eliminate the high-temperature deformation caused by dislocation slippage, advanced aero-engines almost all use directional solidification to prepare single-crystal turbine blades. At present, directional solidification processes that are widely studied at home and abroad include: High Rate Solidification (HRS), Liquid Melt Cooling (LMC) and Gas Cooling Casting (GCC). (The LMC method and the GCC method are both improvements to the HRS method, replacing the original vacuum radiation heat dissipation with liquid and gas convection heat dissipation, and increasing the temperature gradient at the front of the solid-liqu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B11/00C30B29/52B22D27/04C22C19/05
CPCC30B11/00C30B29/52B22D27/045C22C19/057C30B11/003C30B11/02C30B11/14
Inventor 曾龙李军夏明许王斌强李建国
Owner SHANGHAI JIAO TONG UNIV
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