Accurate casting method for metal leakage type suction pouring titanium master alloy

A titanium-based alloy and vacuum suction casting technology, which is applied in the field of precision casting of titanium-based alloys, can solve problems such as alloy interstitial element pollution, heavy workload, and difficulty in obtaining shapes, and achieve easy mass production, fast cooling speed, and refined grain effect

Inactive Publication Date: 2008-08-20
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention solves the problems of heavy workload, high process cost, difficult to obtain complex shape, complex preparation process, the alloy is easily polluted by interstitial elements in the preparation process, the compactness is difficult to guarant

Method used

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  • Accurate casting method for metal leakage type suction pouring titanium master alloy
  • Accurate casting method for metal leakage type suction pouring titanium master alloy
  • Accurate casting method for metal leakage type suction pouring titanium master alloy

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specific Embodiment approach 1

[0012] Specific implementation mode 1: The precision casting method of the metal mold bottom drain type vacuum suction casting titanium-based alloy described in this implementation mode is realized according to the following steps:

[0013] Step 1. Make a metal mold with a number of air holes in the cavity according to the needs. The air holes are distributed on the upper and lower positions of the metal mold. The air holes of the metal mold mold for making blades should be distributed on the upper and lower sides of the metal mold. middle and lower position;

[0014] Step 2, putting the titanium-based alloy prepared according to the pouring amount into a non-consumable electrode electric arc furnace for vacuum melting;

[0015] Step 3. Turn the titanium-based alloy ingot smelted in step 2 into the absorbable castable crucible in the non-consumable electrode electric arc furnace and then melt it, so that the liquid titanium-based alloy seals the graphite hole at the bottom of ...

specific Embodiment approach 2

[0017] Specific implementation mode two: combination figure 1 , figure 2 Illustrate this embodiment, the precision casting method of the metal mold bottom leakage vacuum suction casting titanium-based alloy described in this embodiment is completed by the following steps: 1. Take 20g of prefabricated Ti6Al4V alloy according to the pouring quantity requirement; 2. Put the weighed Ti6Al4V alloy into the non-consumable electrode electric arc furnace for melting. The melting steps are as follows: 1. Turn on the circulating water to cool the non-consumable electrode arc furnace, and turn on the mechanical pump to cool the non-consumable electrode arc furnace. The furnace is pre-evacuated to make the vacuum in the furnace reach 5.0×10 -1 Pa, then turn on the molecular pump to further evacuate until the vacuum degree reaches 6.0×10 -3 Turn off the molecular pump at Pa; 2. Fill in the inert gas argon until the pressure in the furnace body reaches 380mm Hg (0.05MPa) and close the g...

specific Embodiment approach 3

[0018] Specific implementation mode three: combination figure 1 Fig. 3 and Figure 4 Illustrate this embodiment, the investment casting method of the metal type bottom drain type vacuum suction casting titanium-based alloy described in this embodiment is completed by the following steps: one, the Ti-47Al-5Nb-0.5Si alloy is melted, The nominal chemical composition is: titanium 11.4g, aluminum 5.35g, niobium 2.3g, silicon 0.07g; 2. Put the prepared alloy into a non-consumable electrode electric arc furnace for smelting. The smelting steps are as follows: 1. Turn on the circulating water Cool the non-consumable electrode electric arc furnace, and at the same time turn on the mechanical pump to pre-evacuate the non-consumable electrode electric arc furnace, so that the vacuum degree in the furnace body reaches 5.0×10 -1 Pa, then turn on the molecular pump to further evacuate until the vacuum degree reaches 6.0×10 -3Turn off the molecular pump at Pa; 2. Fill in the inert gas argo...

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Abstract

The invention relates to a precision casting method for titanium master alloy by means of casting die bottom-drain vacuum suction casting, belonging to the technical field of precision casting methods for titanium master alloy. The precision casting method in the invention solves the problems in the prior processing technique for titanium master alloy, such as large workload, higher process costs, complex preparation processes, the liability of the alloy to the pollution of interstitial elements during the preparation procedure, poor compactness, and bad quality of the castings. The precision casting method comprises the following steps: making the casting die; conducting vacuum melting of the alloy in a non-consumable electrode arc furnace; turning over the melted titanium mater alloy into a suction casting crucible for remelting and keeping a certain degree of superheat; vacuumizing a vacuum chamber where the casting die is arranged, opening the suction casting button on the suction casting crucible, and enabling the liquid titanium master alloy to fill up the casting die under the actions of the self-gravity and pressure difference, thus obtaining the required casting member. The titanium master alloy casting member produced by the precision casting method in the invention has the advantages of full die filling, good surface quality, fine grains of the casting structure sized from 10 to 30 Mu m, correspondingly thinned dendritic crystal, less segregation, and compact structure.

Description

technical field [0001] The invention relates to a precision casting method for a titanium-based alloy. Background technique [0002] Titanium-based alloy has the characteristics of low density, high specific strength, good corrosion resistance and high thermal strength, which is beneficial to reduce the structural weight of the aircraft and improve the structural efficiency of the aircraft. It is an ideal structural material for aerospace vehicles. Titanium-based alloys can be divided into solid-solution titanium alloys and intermetallic compound titanium alloys, such as TC4 alloys and TiAl-based alloys. Titanium-based alloys have a wide range of uses and have many advantages, but the common disadvantages of solid-solution titanium alloys and intermetallic titanium alloys are: titanium-based alloys have low room temperature plasticity, low deformation limit, high deformation resistance, and easy cracking during cold forming, which greatly reduces the The cold processability...

Claims

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Application Information

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IPC IPC(8): B22D18/06
Inventor 苏彦庆叶喜葱郭景杰傅恒志
Owner HARBIN INST OF TECH
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