W and V alloying beta phase solidifying high Nb-TiAl alloy and preparation method thereof

A technology of alloying and alloying, applied in the field of alloys, to achieve the effect of simple process and easy operation of the process

Active Publication Date: 2014-05-28
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Now, in order to further improve the properties of β-phase solidified high Nb-TiAl alloys, important β-phase stabilizing elements are ad

Method used

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  • W and V alloying beta phase solidifying high Nb-TiAl alloy and preparation method thereof
  • W and V alloying beta phase solidifying high Nb-TiAl alloy and preparation method thereof
  • W and V alloying beta phase solidifying high Nb-TiAl alloy and preparation method thereof

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Example Embodiment

[0023] Example 1

[0024] The preparation of W, V alloying β-phase solidification high Nb-TiAl alloy in this embodiment is achieved through the following steps: 1. Weigh the following raw materials: sponge titanium, high-purity aluminum, aluminum-niobium master alloy, aluminum-tungsten-niobium master alloy and aluminum Vanadium master alloy, including Ti46.1at.%, Al45at.%, Nb8at.%, W0.4at.%, V0.5at.%; 2. The raw material weighed in step 1 is pressed into a metal briquetting machine. When pressing the block, first place the sponge titanium on the inner edge of the mold, and then the bottom of the area surrounded by the sponge titanium is high-purity aluminum layer, aluminum-niobium intermediate alloy layer, aluminum-vanadium intermediate alloy layer, aluminum-tungsten-niobium Intermediate alloy layer and sponge titanium layer; 3. Put the compact obtained in step 2 into a centrifugal castable water-cooled copper crucible vacuum induction levitation smelting furnace, preheat the met...

Example Embodiment

[0026] Example 2

[0027] The preparation of W, V alloying β-phase solidification high Nb-TiAl alloy in this embodiment is achieved through the following steps: 1. Weigh the following raw materials: sponge titanium, high-purity aluminum, aluminum-niobium master alloy, aluminum-tungsten-niobium master alloy and aluminum Vanadium master alloy, including Ti48.8at.%, Al43at.%, Nb8at.%, W0.1at.%, V0.1at%; 2. The raw material weighed in step 1 is pressed into a metal briquetting machine, and pressed Put the titanium sponge on the inner edge of the mold when making the block, and then the bottom of the area enclosed by the titanium sponge is the high-purity aluminum layer, the aluminum-niobium intermediate alloy layer, the aluminum-vanadium intermediate alloy layer, and the middle of the aluminum-tungsten-niobium Alloy layer and sponge titanium layer; 3. Put the compact obtained in step 2 into a centrifugal castable water-cooled copper crucible vacuum induction levitation smelting furna...

Example Embodiment

[0029] Example 3

[0030] The preparation of W, V alloying β-phase solidification high Nb-TiAl alloy in this embodiment is achieved through the following steps: 1. Weigh the following raw materials: sponge titanium, high-purity aluminum, aluminum-niobium master alloy, aluminum-tungsten-niobium master alloy and aluminum Vanadium master alloy, including Ti47.3at.%, Al44at.%, Nb8at.%, W0.2at.%, V0.5at%; 2. The raw materials weighed in step 1 are pressed into a metal briquetting machine and pressed Put the titanium sponge on the inner edge of the mold when making the block, and then the bottom of the area enclosed by the titanium sponge is the high-purity aluminum layer, the aluminum-niobium intermediate alloy layer, the aluminum-vanadium intermediate alloy layer, and the middle of the aluminum-tungsten-niobium Alloy layer and sponge titanium layer; 3. Put the compact obtained in step 2 into a centrifugal castable water-cooled copper crucible vacuum induction levitation smelting furn...

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Abstract

The invention relates to a W and V alloying beta phase solidifying high Nb-TiAl alloy and a preparation method thereof, and belongs to the field of alloy technology. The alloy comprises the following elements by mole: 43%-45% of Al, 5%-15% of Nb, less than or equal to 0.4% of W, less than or equal to 0.5% of V, and the balance of Ti and inevitable impurities. The preparation method comprises the following steps: raw materials are subjected to briquetting forming according to constitutions, titanium sponges are placed on the edge of the inner side of a mould firstly, a high purity aluminium layer, an aluminium niobium intermediate alloy layer, an aluminium vanadium intermediated alloy layer, an aluminium tungsten niobium intermediate alloy layer and a titanium sponge layer are arranged from bottom to top respectively; pressing cakes are placed into a water-cooling copper crucible vacuum induction suspension smelting furnace capable of centrifugal pressure casting for vacuum smelting to obtain melts and the melts are enabled to be mixed uniformly; the melts are cast in a metal casting mould that is preheated in advance and centrifugally rotates for centrifugal rotating and casting and cooled with the furnace. According to the invention, a TiAl alloy that is homogeneous and fine in structure and has no obvious segregation is obtained.

Description

technical field [0001] The invention relates to a high Nb-TiAl alloy and a preparation process thereof, in particular to a W and V alloyed β-phase solidified high Nb-TiAl alloy and a preparation method thereof, belonging to the field of alloy technology. Background technique [0002] Due to its low density, low expansion coefficient, high specific strength, high elastic modulus, and good high-temperature creep and oxidation resistance, TiAl alloy is considered to be a very promising light-weight and high-temperature-resistant structural material. In aviation, spaceflight and automobile industry and other fields. At present, GE has successfully applied it to the rear two-stage blades of the low-pressure turbine of the Boeing 787 GEnx engine, and Mitsubishi has also applied TiAl alloy to automobile turbochargers. However, the shortcomings of TiAl alloys such as low plasticity and poor thermal processing performance limit its wide application. Therefore, scientists have conduc...

Claims

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Application Information

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IPC IPC(8): C22C14/00C22C30/00C22C1/03B22D13/00
Inventor 陈子勇宫子琪周峰柴丽华相志磊
Owner BEIJING UNIV OF TECH
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