Composite preparation method for fine crystal titanium alloy

A titanium alloy and fine-grain technology, which is applied in the field of composite preparation of fine-grained titanium alloys, can solve the problems of large machining allowance, high cost, low material utilization rate, etc. Effect

Inactive Publication Date: 2012-07-25
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

[0003] Large plastic deformation refinement, cyclic heat treatment refinement, hydrogen treatment refinement, and powder refinement methods can all prepare ideal fine-grained titanium alloys, but only large plastic deformation refinement methods can prepare large dense materials. It is simple and has high application feasibility, but its material utilization rate is low, the machining allowance is large, and the cost is high

Method used

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  • Composite preparation method for fine crystal titanium alloy
  • Composite preparation method for fine crystal titanium alloy
  • Composite preparation method for fine crystal titanium alloy

Examples

Experimental program
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Effect test

example 1

[0029] Ti-1023 powdered titanium alloy ( figure 2 ).

[0030] After the Ti-1023 alloy powder is prepared by the hydrogenation dehydrogenation process in the preparation of the blank in step 1 of the method, the -150 mesh powder is screened out for packaging, and the initial blank is obtained by cold isostatic pressing under a pressure of 200 MPa. The cold isostatic pressing time is 10min; After step 2 vacuum sintering, the vacuum degree is 10 -3 Pa, the sintering temperature is 1300°C, and the sintering holding time is 3h, the structure of the sintered Ti-1023 powder alloy is as follows figure 2 As shown in (a); after step 3 high-temperature isothermal forging, the isothermal forging temperature is 840 °C, and the constant strain rate is controlled to 5×10 -2 the s -1 , the total deformation of forging is 60%; after continuous low-temperature isothermal forging in step 4, the temperature of isothermal forging is 760°C, and the constant strain rate is controlled as 5×10 -...

example 2

[0034] Ti-17 powdered titanium alloy ( image 3 ).

[0035] After the Ti-17 alloy powder is prepared by the hydrogenation dehydrogenation process in the preparation of the blank in step 1 of this method, the 100-150 mesh powder is screened out for packaging, and the initial blank is obtained by cold isostatic pressing under a pressure of 200 MPa. The cold isostatic pressing time 15min; through step 2 vacuum sintering, the vacuum degree is 10 -3 Pa, the sintering temperature is 1350°C, and the sintering holding time is 3h. The structure of the sintered Ti-17 powder alloy is as follows image 3 As shown in (a); after step 3 high-temperature isothermal forging, the isothermal forging temperature is 920 °C, and the constant strain rate is controlled to 5×10 -2 the s -1 , the total deformation of forging is 70%; continuous low-temperature isothermal forging in step 4, the temperature of isothermal forging is 860°C, and the constant strain rate is controlled as 5×10 -2 the s -1 ,...

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Abstract

The invention relates to a composite preparation method for a fine crystal titanium alloy, which comprises the following steps of: performing cold isostatic pressing and vacuum sintering on hydrogenated dehydrogenation titanium alloy powder, then performing first heating high-temperature isothermal forging by adopting medium strain rate over a transformation point to close internal holes of the powdery alloy, improve the compactness of the alloy and improve the plasticity of the alloy, performing second heating low-temperature isothermal forging by adopting medium strain rate below the transformation point to further compact and thin the powdery titanium alloy, and finally performing thermal treatment to obtain the high-compactness fine crystal powdery titanium alloy. According to the preparation method, the preparation period of common forged titanium alloy is effectively shortened, the loss of raw materials is reduced, near net shape precision forgings can be simultaneously formed, the prepared powdery titanium alloy has no component segregation, the compactness is more than 99 percent, the equiaxial tissues are uniform and fine, the size of alpha phase is less than 2 microns, and the mechanical property is excellent.

Description

technical field [0001] The invention relates to a compound preparation method of fine-grained titanium alloy, belongs to the field of titanium alloy preparation, and relates to the grain refinement of titanium alloy material and the near-net forming method of forgings and the like. Background technique [0002] At present, the preparation methods of titanium alloy grain refinement mainly include large plastic deformation refinement, cyclic heat treatment refinement, hydrogen treatment refinement, powder refinement and so on. The large plastic deformation method is to apply large plastic deformation to the material under relatively low temperature conditions, so that the material structure is gradually optimized and finally fine grains are obtained. Typical large plastic deformation processes include equal channel extrusion, high-pressure torsional deformation, multiple isothermal forging, Cumulative stacking, etc. The refinement of cyclic heat treatment is to use the allotr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C14/00C22C1/04C22F1/18
Inventor 赵张龙郭鸿镇姚泽坤王敏
Owner NORTHWESTERN POLYTECHNICAL UNIV
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