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Wrapping cover method suitable for isothermal forging of Ti-Al-series intermetallic compound

An intermetallic compound and isothermal forging technology, which is applied in the field of warm forging sheathing, can solve the problems of narrow deformation temperature range, easy cracking, easy drum shape of the material, and difficult deformation of the upper and lower surfaces, so as to meet the requirements of simple forging equipment and reduce the temperature. The effect of loss and narrow heat-affected zone

Inactive Publication Date: 2017-01-04
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, TiAl, Ti 2 The as-cast grain size of AlNb-based intermetallic compounds is large, the room temperature plasticity is poor, the high-temperature deformation resistance is large, and the hot workability is poor. Through isothermal forging, the microstructure is refined and the as-cast defects are eliminated. Compound processing performance, an effective means to improve room temperature plasticity, Ti-Al intermetallic compounds have a narrow deformation temperature range and are easy to crack
The thermal processing temperature of Ti-Al intermetallic compounds is generally in the range of 900-1300 °C, and oxidation is prone to occur during the forging process, and during the naked forging process without a jacket, the material is prone to drum shape, and there are hard-to-deform areas on the upper and lower surfaces , the outer surface of the material is prone to cracks under the action of bidirectional tensile stress

Method used

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  • Wrapping cover method suitable for isothermal forging of Ti-Al-series intermetallic compound
  • Wrapping cover method suitable for isothermal forging of Ti-Al-series intermetallic compound
  • Wrapping cover method suitable for isothermal forging of Ti-Al-series intermetallic compound

Examples

Experimental program
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Effect test

Embodiment 1

[0041] A sheathing method suitable for isothermal forging of Ti-Al intermetallic compounds. The Ti-Al intermetallic compound in this embodiment is Ti 2 For AlNb-based alloys, the size of the sheath depends on the size of the billet 3 . The sheath of the invention has heat preservation effect, good deformation coordination, is easy to weld, simple and easy to operate, reduces vacuuming process, and improves production efficiency. The structure of the bag is simple and practical, low cost, easy to operate, and can be used for Ti 2 AlNb-based alloys are produced by isothermal forging, and are also suitable for other difficult-to-deform alloys and high-temperature alloys. The specific operation steps are as follows:

[0042] 1. Preparation of sheathing: The size of the blank 3 is Φ60×100mm, and the wall thickness of the sheathing is selected as 10mm in consideration of the size of the blank 3, heat preservation and deformation coordination. The sheath material is low carbon st...

Embodiment 2

[0051] A sheathing method suitable for isothermal forging of Ti-Al intermetallic compounds. The Ti-Al intermetallic compound in this embodiment is Ti 2 For AlNb-based alloys, the size of the sheath depends on the size of the billet 3 . The sheath of the invention has heat preservation effect, good deformation coordination, is easy to weld, simple and easy to operate, reduces vacuuming process, and improves production efficiency. The structure of the bag is simple and practical, low cost, easy to operate, and can be used for Ti 2 AlNb-based alloys are produced by isothermal forging, and are also suitable for other difficult-to-deform alloys and high-temperature alloys. The specific operation steps are as follows:

[0052] 1. Preparation of sheath: The sheath can be made of stainless steel, pure titanium or titanium alloy. The size of the blank 3 in this embodiment is Φ60×109mm. Considering the size of the blank 3, insulation and deformation coordination, the wall thickness o...

Embodiment 3

[0061] A sheathing method suitable for isothermal forging of Ti-Al intermetallic compounds. This example is basically the same as Example 1, the difference is that the Ti-Al intermetallic compound in this embodiment is a TiAl-based alloy, and the isothermal forging process parameters of this example are: billet temperature 1200°C / 2.5h, The mold temperature is 950°C, and the strain rate of isothermal forging is 1×10 -2 the s -1 , The amount of deformation is 60%. After isothermal forging, the blank with sheath is annealed at 1100℃ / 10h. The photo of the sample after isothermal forging to remove the sheath is as follows image 3 with Figure 4 shown. Depend on image 3 with Figure 4 Yes, after one-step sheathed isothermal forging, the surface quality of the TiAl-based alloy sample is better, and no microcracks occur.

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Abstract

The invention relates to a wrapping cover method suitable for isothermal forging of a Ti-Al-series intermetallic compound. The method comprises the following steps that firstly, wrapping cover pretreatment is conducted; secondly, the surface of a blank of the Ti-Al-series intermetallic compound is coated with a high-temperature anti-oxidization coating; thirdly, in the state that the high-temperature anti-oxidization coating is kept wet, the blank of the Ti-Al-series intermetallic compound is arranged in a wrapping cover, and a transition layer is arranged between the wrapping cover and the blank of the Ti-Al-series intermetallic compound; and fourthly, the wrapping cover is welded and sealed. Compared with the prior art, the wrapping cover method has the beneficial effects that the wrapping cover is simple and easy to use, the production efficiency is high, labor intensity is low, cracking and oxidizing in the Ti-Al-series intermetallic compound deforming process can be effectively prevented, and heat losses of the blank in the transferring process are reduced.

Description

technical field [0001] The invention belongs to the field of thermal processing of Ti-Al series intermetallic compounds, and in particular relates to a cladding method and application suitable for isothermal forging of difficult-to-deform alloys, in particular to a cladding suitable for isothermal forging of Ti-Al series intermetallic compounds set of methods. Background technique [0002] Intermetallic compounds have both the plasticity of metals and the high-temperature strength of ceramics. Therefore, they are recognized as the most promising new high-temperature structural materials between superalloys and ceramics, and have become new high-temperature structural materials that have been developed and applied in recent years. Ti-Al intermetallic compounds have attracted much attention due to their lower density, higher high temperature performance and creep resistance. Current research mainly focuses on Ti 3 Al, TiAl and Ti 2 Among them, TiAl has the lowest density an...

Claims

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Application Information

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IPC IPC(8): B21J5/00B21J3/00B21J1/00
CPCB21J1/00B21J3/00B21J5/00
Inventor 沈军曲寿江陈卓冯艾寒刘俞成
Owner TONGJI UNIV
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