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Cold-rolled high-strength titanium alloy pipe texture control method

A technology of titanium alloy tube and control method, applied in the field of metal material processing, can solve the problems of single process design index, CSR value and performance fluctuation of finished tube, and achieve the effect of efficient and precise control

Active Publication Date: 2019-08-23
NORTHWESTERN POLYTECHNICAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the process design index is single in the existing texture control method, and the CSR value and performance fluctuation of the finished pipe material are serious. The method aims to obtain high-strength titanium alloy pipes with reasonable CSR and excellent performance, and this method does not need to add additional processes, is easy to implement, and has broad application prospects

Method used

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  • Cold-rolled high-strength titanium alloy pipe texture control method
  • Cold-rolled high-strength titanium alloy pipe texture control method
  • Cold-rolled high-strength titanium alloy pipe texture control method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] This example is a comparison of pipe texture and CSR value under different rolling specification design schemes based on numerical simulation. The specific implementation process includes the following steps:

[0027] In the first step, based on the ABAQUS finite element software and the viscoplastic self-consistent model (VPSC model), combined with the actual rolling conditions, a two-roll Pilger cold-rolled TA18 titanium alloy tube macro and micro numerical prediction platform was established for the macro deformation during the rolling process Accurate simulation and prediction of behavior and micro-texture evolution;

[0028] The second step is to design different pass rolling schemes, pass specification design schemes and corresponding Q total and ε e As shown in Table 1, rolling scheme 1 uses 6 passes, and its total equivalent strain ε e is 3.58, and the rolling Q of each pass total are basically greater than 1.3, the second rolling scheme adopts 4 passes, and ...

Embodiment 2

[0034] This embodiment is a numerical simulation comparison of pipe texture and CSR value under different mold design parameters based on numerical simulation. The specific implementation process includes the following steps:

[0035] In the first step, the numerical simulation adopts the macro-microscopic numerical prediction platform of the two-roll Pilger cold-rolled TA18 titanium alloy tube established in Example 1, and the simulated rolling specification is selected from Φ32×3mm→Φ17.48×1.07mm;

[0036] In the second step, different pass index and pass clearance index are selected for mold design, and the selection scheme of pass index and pass clearance index is shown in Table 2;

[0037] The third step is to obtain the mold design pair Q through numerical simulation transient and α influence law such as figure 2As shown, the pipe texture under different mold design parameters is as follows image 3 shown.

[0038] Table 2 Selection scheme of mold design parameters

...

Embodiment 3

[0042] In this embodiment, the high-strength TA18 titanium alloy pipe with a specification of Φ12×0.9mm is used as the target object, and the cold rolling test is carried out to measure the CSR value of the finished product. The specific implementation process includes the following steps:

[0043] In the first step, the rolling scheme 1 in Table 1 is used to carry out 6 passes of two-roller pilger cold rolling, and the die design for each pass is E 1 and pass clearance index E 2 Select 2.8 and 2.0 respectively, the pipe is subjected to vacuum recrystallization annealing at 750°C in the middle of each rolling pass, and the pipe is subjected to vacuum stress relief annealing at 550°C after the final rolling pass;

[0044] In the second step, the CSR value of the finished pipe is obtained by uniaxial tensile test combined with three-dimensional digital correlation (DIC) screen strain measurement system. The measurement results are as follows: Figure 4 As shown, the CSR value o...

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Abstract

The invention discloses a cold-rolled high-strength titanium alloy pipe texture control method. Overall adjustment and control are performed by adjusting the overall Q value and equivalent strain epsilon e in the cold rolling process, and then pipe texture fine adjustment and control are achieved by adjusting the pipe strain path in the rolling process. By means of the method provided by the invention, precise control over the cold-rolled high-strength titanium alloy pipe texture and performance can be more effectively achieved, in addition, no extra procedure needs to be added, implementing is easy, and the application prospects are wide.

Description

technical field [0001] The invention belongs to the technical field of metal material processing, and in particular relates to a method for controlling the texture of a cold-rolled high-strength titanium alloy pipe. Background technique [0002] The pipeline system is a key component that plays important functions such as fluid transmission in high-end equipment in aerospace and other fields. Its performance will directly affect the safety and airworthiness of the aircraft. It is also called the "vascular" part of aerospace vehicles. and life line. The high-strength TA18 titanium alloy belongs to the near-α-type titanium alloy, which has good mechanical properties, processing plasticity, formability and corrosion resistance. Therefore, this alloy pipe has been increasingly widely used in pipeline systems such as aircraft fuel and environmental control. Compared with pipe forming processes such as cold drawing and extrusion, the pipe undergoes incremental local loading domin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/18
CPCC22F1/183
Inventor 李恒魏栋张海芹张铎王雨菲
Owner NORTHWESTERN POLYTECHNICAL UNIV
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