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Casting method of large size hole defect less TiA1 base alloy ingot

A base alloy, large-size technology, applied in the field of melting and casting of TiAl-based alloy ingots, can solve the problems of inability to accurately control the volatilization loss of low melting point elements, uneven composition of ingots, difficulty in obtaining ingots, etc., and achieve easy alloy composition accuracy , Guarantee the dosage of alloy components and improve the effect of yield

Inactive Publication Date: 2006-01-11
HARBIN INST OF TECH
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  • Summary
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  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of the low utilization rate of materials using direct casting technology in the existing TiAl-based alloy smelting method; it is difficult to obtain large-sized ingots by using the vacuum induction solidification shell melting technology of water-cooled copper crucible; Electrode arc melting technology provides a method for melting and casting TiAl-based alloy ingots with large size and no holes and defects due to the problem of uneven ingot composition and the inability to accurately control the volatilization loss of low melting point elements

Method used

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  • Casting method of large size hole defect less TiA1 base alloy ingot
  • Casting method of large size hole defect less TiA1 base alloy ingot
  • Casting method of large size hole defect less TiA1 base alloy ingot

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specific Embodiment approach 1

[0006] Specific embodiment one: combine 1, figure 2 , image 3 Describe this embodiment, this embodiment is completed by the following two steps: a, using water-cooled copper crucible 2 vacuum induction shell melting technology to melt and cast TiAl-based alloy consumable electrode; b, using vacuum consumable electrode arc melting technology to remelt The TiAl-based alloy electrode prepares the TiAl-based alloy ingot; the described water-cooled copper crucible 2 vacuum induction shell melting and casting technology melting and casting the TiAl-based alloy consumable electrode is completed by the following steps: a', the melting of the TiAl-based alloy raw material: the sponge titanium 3 Put it in the water-cooled copper crucible 2 and place it well. The upper end of the sponge titanium 3 is 1 / 4 to 1 / 3 from the top of the water-cooled copper crucible 2. Then put the lower aluminum block 6, the intermediate alloy 5, and the upper aluminum block 4 Embed in the middle of the tit...

specific Embodiment approach 2

[0007] Specific implementation mode two: combination figure 1 , figure 2 , image 3 Describe this embodiment, the difference between this embodiment and specific embodiment one is: in the a' step of this embodiment, the upper end of sponge titanium 3 leaves 1 / 3 space from the top of water-cooled copper crucible 2, will accommodate water-cooled The vacuum chamber of the copper crucible 2 is evacuated to 0.5Pa, filled with argon gas to 850Pa, and then evacuated to 0.5Pa, and this is repeated three times. The vacuum degree of the vacuum chamber containing the water-cooled copper crucible 2 is always kept at 0.5Pa. 2, the frequency of the power supply is 6kHz, the power supply is 300kW, the power supply is increased at a rate of ≤0.5kW / s, and the temperature is kept for 10 minutes, and then the power is reduced to 250kW, and the temperature is kept for 5 minutes; in step b', the length L of each pouring electrode is 30 cm, the pouring temperature is 1600°C, and the poured TiAl-...

specific Embodiment approach 3

[0008] Specific implementation mode three: combination figure 2 , image 3 This embodiment will be described. The electrode head 1 of this embodiment is made of TC4 alloy material. The electrode head 1 made of the alloy material has good strength and is easy to clamp.

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Abstract

A smelting-casting method for casting large-size TiAl-based alloy ingot without pores includes such steps as preparing consumable electrode of TiAl-based alloy by ISM technology, resmelting the TiAl-based alloy electrode and casting TiAl-based alloy ingot. It features high uniformity and large size.

Description

Technical field: [0001] The invention relates to a method for melting and casting a TiAl-based alloy ingot, in particular to a method for melting and casting a large-sized TiAl-based alloy ingot without hole defects. Background technique: [0002] TiAl-based alloys are ideal high-temperature lightweight structural materials and are expected to be widely used in hot-end components in aerospace and automotive fields. An important way to obtain this alloy component is thermomechanical treatment, and its basic links include ingot casting + forging + machining. In order to improve processing efficiency, the demand for large-size TiAl-based alloy ingots is increasingly urgent. The material utilization rate of TiAl-based alloy ingots cast by direct casting is only 30%, and the rest has shrinkage cavities and porosity. The solidification characteristics and physical properties of TiAl-based alloys determine the difficulty of casting TiAl-based alloy ingots. The particularity of the...

Claims

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Application Information

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IPC IPC(8): B22D21/00B22D7/02
Inventor 苏彦庆郭景杰丁宏升吴士平贾均傅恒志
Owner HARBIN INST OF TECH
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