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A kind of cr, mn alloyed β-phase solidification 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 process

Active Publication Date: 2017-05-03
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 added, while the physical metallurgical behavior of simultaneous addition of Cr and Mn in high Nb-TiAl alloys has not been reported in detail

Method used

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  • A kind of cr, mn alloyed β-phase solidification high nb-tial alloy and preparation method thereof
  • A kind of cr, mn alloyed β-phase solidification high nb-tial alloy and preparation method thereof
  • A kind of cr, mn alloyed β-phase solidification high nb-tial alloy and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0024] The preparation of Cr, Mn alloyed β-phase solidified high Nb-TiAl alloy in this embodiment is realized through the following steps: 1. Weigh the following raw materials: sponge titanium, high-purity aluminum, aluminum-niobium master alloy, electrolytic chromium sheet and electrolytic manganese sheet , wherein Ti45.5at.%, Al45at.%, Nb8at.%, Cr0.5at.%, Mn1at.%; 2. The raw materials weighed in step 1 are carried out into briquettes by a metal briquetting machine. Sponge titanium is placed on the inner edge of the mold, and then the inner part of the area surrounded by sponge titanium is high-purity aluminum layer, aluminum-niobium master alloy layer, electrolytic manganese sheet layer, electrolytic chromium sheet layer and sponge titanium layer from bottom to top. 3. Put the briquette obtained in step 2 into a water-cooled copper crucible vacuum induction melting furnace that can be centrifugally cast, preheat the metal mold to 400°C before melting, and evacuate the water-c...

Embodiment 2

[0027] The preparation of Cr, Mn alloyed β-phase solidified high Nb-TiAl alloy in this embodiment is realized through the following steps: 1. Weigh the following raw materials: sponge titanium, high-purity aluminum, aluminum-niobium master alloy, electrolytic chromium sheet and electrolytic manganese sheet , wherein Ti48.8at.%, Al43at.%, Nb8at.%, Cr0.1at.%, Mn0.1at%; 2. The raw materials weighed in step 1 are carried out into briquettes by a metal briquetting machine. When briquetting, first Place the sponge titanium on the inner edge of the mold, and then the inner layer surrounded by the sponge titanium is the high-purity aluminum layer, the aluminum-niobium master alloy layer, the electrolytic manganese sheet layer, the electrolytic chromium sheet layer and the sponge titanium layer from bottom to top. ; 3. Put the briquette obtained in step 2 into a water-cooled copper crucible vacuum induction melting furnace that can be centrifugally poured, preheat the metal casting mold...

Embodiment 3

[0030] The preparation of Cr, Mn alloyed β-phase solidified high Nb-TiAl alloy in this embodiment is realized through the following steps: 1. Weigh the following raw materials: sponge titanium, high-purity aluminum, aluminum-niobium master alloy, electrolytic chromium sheet and electrolytic manganese sheet , wherein Ti47.4at.%, Al44at.%, Nb8at.%, Cr0.25at.%, Mn0.35at%; 2. The raw materials weighed in step 1 are carried out into briquettes by a metal briquetting machine. When briquetting, first Place the sponge titanium on the inner edge of the mold, and then the inner layer surrounded by the sponge titanium is the high-purity aluminum layer, the aluminum-niobium master alloy layer, the electrolytic manganese sheet layer, the electrolytic chromium sheet layer and the sponge titanium layer from bottom to top. ; 3. Put the briquette obtained in step 2 into a water-cooled copper crucible vacuum induction melting furnace that can be cast centrifugally. to 2.5×10 -3 mbar; 4. Increa...

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Abstract

The invention relates to a Cr and Mn 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 0.5% of Cr, less than or equal to 1% of Mn, 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, and an aluminium niobium intermediate alloy layer, an electrolytic manganese piece layer, an electrolytic chromium piece 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 Cr, Mn 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 conduct...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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