A Method for Refinement of Titanium Alloy Microstructure by Cyclic Dislocation Shear Large Plastic Deformation

A technology of large plastic deformation and microstructure, used in metal material processing equipment and processing fields, can solve the problems of uneven deformation, high sensitivity of microstructure deformation history, differences in microstructure characteristics, etc., and achieve the effect of refining grains

Active Publication Date: 2022-03-25
HARBIN INST OF TECH AT WEIHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The SPD method of titanium alloys, such as multi-directional forging, has many difficulties in controlling the uniformity of the microstructure. The most important problem is that the microstructure is highly sensitive to the deformation history, and the uneven deformation can easily lead to large differences in microstructure characteristics.

Method used

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  • A Method for Refinement of Titanium Alloy Microstructure by Cyclic Dislocation Shear Large Plastic Deformation
  • A Method for Refinement of Titanium Alloy Microstructure by Cyclic Dislocation Shear Large Plastic Deformation

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Experimental program
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Effect test

specific Embodiment approach 1

[0065] Step 1. Machining and assembling a deformation device for metal blank deformation.

[0066] The deformation device includes a punch 1, a die 2, a die cover 3, a push rod 5, an inclined pad 4 and a lower template 6, and the die cover 3 and the lower template 6 are fixedly connected, and the die 2 is located in the In the mold cover 3, the inside of the die 2 is a cylindrical cavity with an inner diameter of d=50mm, and the inclined pad 4 is located at the bottom side of the die cavity of the die 2; the edge of the die 2 is provided with chamfers, The punch 1 is cylindrical, and the punch 1 is matched with the cavity, the slope pad 4 is a stepped slope, the thickness of the slope pad 4 is different on both sides, and the angle of the slope is 10 °, the punch 1, the die 2, and the inclined pad 4 are all made of superalloy materials.

[0067] Step 2, heating the metal blank and keeping it warm,

[0068] The cylindrical metal billet Ti-55531 titanium alloy was heated to 90...

specific Embodiment approach 2

[0078] Step 1. Machining and assembling a deformation device for metal blank deformation.

[0079] The deformation device includes a punch 1, a die 2, a die cover 3, a push rod 5, an inclined pad 4 and a lower template 6, and the die cover 3 and the lower template 6 are fixedly connected, and the die 2 is located in the In the mold cover 3, the inside of the die 2 is a cylindrical cavity with an inner diameter of d=40mm, and the inclined pad 4 is located at the bottom side of the die cavity of the die 2; the edge of the die 2 is provided with chamfers, The punch 1 is cylindrical, and the punch 1 is matched with the cavity, the slope pad 4 is a stepped slope, the thickness of the two sides of the slope pad 4 is different, and the angle of the slope is 15 °, the punch 1, the die 2, and the inclined pad 4 are all made of superalloy materials.

[0080] Step 2, heating the metal blank and keeping it warm,

[0081] The cylindrical metal billet Ti-1023 titanium alloy was heated to ...

specific Embodiment approach 3

[0091]Step 1. Machining and assembling a deformation device for metal blank deformation.

[0092] The deformation device includes a punch 1, a die 2, a die cover 3, a push rod 5, an inclined pad 4 and a lower template 6, and the die cover 3 and the lower template 6 are fixedly connected, and the die 2 is located in the In the mold cover 3, the inside of the die 2 is a cylindrical cavity with an inner diameter of d=30mm, and the inclined pad 4 is located at the bottom side of the die cavity of the die 2; the edge of the die 2 is provided with chamfers, The punch 1 is cylindrical, and the punch 1 is matched with the cavity, the slope pad 4 is a stepped slope, the thickness of the slope pad 4 is different on both sides, and the angle of the slope is 20 °, the punch 1, the die 2, and the inclined pad 4 are all made of superalloy materials.

[0093] Step 2, heating the metal blank and keeping it warm,

[0094] The cylindrical metal billet Ti-55511 titanium alloy was heated to 900...

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Abstract

The invention discloses a method for refining the microstructure of titanium alloy by cyclic dislocation shearing and large plastic deformation. Loading makes the cylindrical metal billet under the condition of isothermal deformation, at a certain temperature T in the single-phase region (T>T β ,T β β phase transition temperature) undergoes overall shear deformation, and then the billet is taken out, rotated at a certain angle along the axis of the loading direction (the cylindrical billet can also be rotated after adjusting the up and down directions) and put into the processing device again, and the billet is subjected to a different load. For the shear deformation in the last flow direction, the billet is then repeatedly taken out and rotated at a certain angle before loading again, so that the billet undergoes uniform shear deformation. This method accumulates strain energy inside the titanium alloy billet through cyclic dislocation and severe shear deformation, so that the internal grains are broken and dynamic recrystallization occurs, so that the billet is deformed after multiple rotations at different angles, and the deformation at different positions of the component is improved. property, obtaining equiaxed, fine and weakly textured β-phase grains.

Description

technical field [0001] The application relates to the field of metal material processing equipment and processing methods, in particular to a method for refining the microstructure of titanium alloys through cyclic dislocation shearing and large plastic deformation. Background technique [0002] Titanium alloys are widely used in aerospace and other fields due to their excellent strength, toughness and corrosion resistance. The mechanical properties such as strength, toughness and plasticity of titanium alloy are closely related to the microstructure characteristics such as β matrix grain size and morphology, α phase morphology and content. However, the thermal processing parameter window of titanium alloy is narrow, and it is very easy to cause uneven precipitation of α phase and obvious texture tendency after processing due to factors such as uneven deformation and coarse initial β grains, which seriously affect the microscopic properties of the material. Uniformity of st...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/18C22C14/00
CPCC22F1/183C22C14/00
Inventor 张鹏陈刚常旭升张鸿名陈伟
Owner HARBIN INST OF TECH AT WEIHAI
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