Method for refining titanium alloy microstructure through circular dislocation shearing and severe plastic deformation

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

Active Publication Date: 2021-09-21
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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  • Method for refining titanium alloy microstructure through circular dislocation shearing and severe plastic deformation
  • Method for refining titanium alloy microstructure through circular dislocation shearing and severe plastic deformation

Examples

Experimental program
Comparison scheme
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, the die cover 3 and the lower template 6 are fixedly connected, and the groove 2 is located in the concave In the mold cover 3, the inside of the groove 2 is a cylindrical cavity with an inner diameter of d=50mm, and the inclined pad 4 is located at the bottom of the cavity of the groove 2; the edge of the concave mold 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...

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, the die cover 3 and the lower template 6 are fixedly connected, and the groove 2 is located in the concave In the mold cover 3, the inside of the groove 2 is a cylindrical cavity with an inner diameter of d=40mm, and the inclined pad 4 is located at the bottom of the cavity of the groove 2; the edge of the concave mold 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 w...

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, the die cover 3 and the lower template 6 are fixedly connected, and the groove 2 is located in the concave In the mold cover 3, the inside of the groove 2 is a cylindrical cavity with an inner diameter of d=30mm, and the inclined pad 4 is located at the bottom of the cavity of the groove 2; the edge of the concave mold 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 ...

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Abstract

The invention discloses a method for refining a titanium alloy microstructure through circular dislocation shearing and severe plastic deformation. Loading is carried out, so that a cylindrical metal blank is subjected to overall shear deformation at a certain temperature T (T is greater than T beta, and T beta is a beta phase transformation temperature) in a single-phase region under an isothermal deformation condition, then the blank is taken out, the blank is rotated by a certain angle along the axis of a loading direction (or rotated after the vertical direction of the cylindrical blank is adjusted) and then placed into a machining device again, a load is applied to enable the blank to generate shear deformation different from shear deformation in a last flowing direction, then the blank is taken out, rotated for a certain angle, and then is loaded again repeatedly , so that the blank is subjected to uniform shear deformation. According to the method, strain energy is accumulated in the titanium alloy blank through circular dislocation violent shear deformation, so that crystal grains in the titanium alloy blank are broken and dynamically recrystallized, the blank is deformed after being rotated by different angles for multiple times, the deformation uniformity of different positions of a component is improved, and equiaxial fine weak-texture beta-phase crystal grains are obtained.

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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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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