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Method to eliminate primary Beta grain boundary in laser additive manufacturing TC4 alloy by induction heating of added B

A technology of induction heating and laser additive, which is applied in the direction of additive manufacturing, additive processing, process efficiency improvement, etc., can solve the problems of large anisotropy, high strength, low plasticity, etc. Grain boundaries, the effect of improving plasticity in the as-deposited state

Inactive Publication Date: 2018-09-21
XI AN JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the coarse β columnar crystal + martensite forms the typical characteristics of high strength and low plasticity of LAM-TC4. At the same time, the coarse β columnar crystal will inevitably lead to a large difference in the performance along the laser forming direction and the horizontal direction. the phenomenon of greater anisotropy

Method used

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  • Method to eliminate primary Beta grain boundary in laser additive manufacturing TC4 alloy by induction heating of added B
  • Method to eliminate primary Beta grain boundary in laser additive manufacturing TC4 alloy by induction heating of added B
  • Method to eliminate primary Beta grain boundary in laser additive manufacturing TC4 alloy by induction heating of added B

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] When the mass proportion of B powder is 0.01%, the microstructure of the sample obtained by the above method is as follows: figure 2 As shown, the original β grain boundary is formed by the boundary line of two parallel rows of flaky α in opposite directions, where figure 2 Middle b is the magnified rendering of a.

Embodiment 2

[0032] When the mass ratio of B powder is 0.025%, the microstructure of the sample obtained by the above method is as follows: image 3 As shown, the lamella α arranged in parallel still exists, and the boundary line is formed by the first connected lamella α to form the original β grain boundary, where image 3 Middle b is the magnified rendering of a.

Embodiment 3

[0034] When the mass ratio of B powder is 0.05%, the microstructure of the sample obtained by the above method is as follows: Figure 4 As shown, the grain boundary is mainly dominated by the flaky α that is connected to the first position, and the flaky α arranged in parallel is very small, and the macrostructure is no longer β columnar grains, mainly in the form of flaky grains, of which Figure 4 Middle b is the magnified rendering of a.

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Abstract

The invention discloses a method to eliminate primary Beta grain boundary in laser additive manufacturing TC4 alloy by induction heating of added B; the method comprises the steps of S1, drying B powder and titanium alloy powder in vacuum, wherein the B power accounts for 0.01-0.2% by mass; S2, mixing well the dried B powder of step S1 and titanium alloy powder to obtain mixed powder; S3, heatinga base material to 900-1100 DEG C, and forming a sample on the base material by a laser additive manufacturing apparatus. The method has the advantages that primary Beta grain boundary of laser additive manufacturing TC4 can be eliminated, grain is fined, and microstructure of TC4 alloy is improved.

Description

technical field [0001] The invention belongs to the research field of microstructure control and mechanical property optimization of titanium alloys manufactured by laser additive manufacturing, and specifically relates to a method for eliminating primary β grain boundaries of TC4 alloys produced by laser additive manufacturing by induction heating with B addition. Background technique [0002] Laser additive manufacturing of titanium alloys is an emerging technology developed in recent years. This technology melts synchronously transported titanium alloy powder through high-power lasers, and accumulates formed parts point by point, which overcomes the high melting point of titanium alloy itself. The disadvantages of high processing difficulty and complex parts processing technology brought about by the characteristics of high molten state activity and large deformation resistance have been more and more researched and applied in the field of aerospace and national defense ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/105B22F1/00B33Y70/00B33Y10/00
CPCB22F1/0003B33Y10/00B33Y70/00B22F2999/00B22F10/00B22F10/38B22F10/34B22F10/28B22F10/36B22F10/32B22F12/17B22F2202/07Y02P10/25
Inventor 张安峰李涤尘梁朝阳霍浩张金智刘亚雄
Owner XI AN JIAOTONG UNIV
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