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A method for controlling the precipitation direction of intermetallic compounds in titanium alloy tubes

A technology of intermetallic compounds and titanium alloy pipes, which is applied in the field of titanium alloy pipes, can solve the problems that the precipitation of intermetallic compounds along the distribution orientation of the pipes cannot meet the ideal requirements, and achieve good intermetallic compound orientation, good plasticity and strength. Effect

Active Publication Date: 2017-04-12
WESTERN TITANIUM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] When titanium pipes produced by conventional rolling processing methods are supplied according to ASME SB338 standards, the precipitation of intermetallic compounds along the distribution orientation of the pipes cannot meet the ideal requirements.

Method used

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  • A method for controlling the precipitation direction of intermetallic compounds in titanium alloy tubes
  • A method for controlling the precipitation direction of intermetallic compounds in titanium alloy tubes
  • A method for controlling the precipitation direction of intermetallic compounds in titanium alloy tubes

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Experimental program
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Effect test

Embodiment 1

[0023] This embodiment processes the TA22 titanium alloy finished pipe of Φ15mm×1mm (the outer diameter is 15mm, and the wall thickness is 1mm), and the titanium alloy tube blank used is the TA22 titanium alloy tube blank of Φ35mm×6mm (the tube blank adopts conventional methods to make), The specific processing method is:

[0024] Step 1, using a reciprocating cold rolling mill to carry out 4 passes of cold rolling on the titanium alloy tube blank to obtain a titanium alloy tube; pickling treatment, and then perform inter-pass annealing treatment on the tube blank after degreasing and pickling treatment, the temperature of the inter-pass annealing treatment is 500°C, and the time is 2h; the deformation of each pass of cold rolling and The ratio Q of inner diameter reduction rate and wall thickness reduction rate is shown in Table 1;

[0025] The data of each pass of cold rolling in embodiment 1 of table 1

[0026]

[0027] Step 2: Carry out degreasing and pickling treatme...

Embodiment 2

[0032] In this embodiment, the TA22 titanium alloy finished pipe of Φ25mm×1.5mm is processed (the outer diameter is 25mm, and the wall thickness is 1.5mm). ), the processing method is specifically:

[0033] Step 1. The titanium alloy tube billet is cold-rolled three times by using a reciprocating cold-rolling mill to obtain a titanium alloy tube; pickling treatment, and then perform inter-pass annealing treatment on the tube blank after degreasing and pickling treatment, the temperature of the inter-pass annealing treatment is 450°C, and the time is 3h; the deformation of each pass of cold rolling and The ratio Q of inner diameter reduction rate and wall thickness reduction rate is shown in Table 2;

[0034] Table 2 Embodiment 2 The data of each pass of cold rolling

[0035]

[0036] Step 2: Carry out degreasing and pickling treatment on the titanium alloy tube described in step 1, and then perform finished annealing treatment on the titanium alloy tube after degreasing a...

Embodiment 3

[0039] In this embodiment, Φ41mm×1.5mm TA10 titanium alloy finished pipe (outer diameter 41mm, wall thickness 1.5mm) is processed, and the titanium alloy tube blank used is Φ70mm×8mm TA10 titanium alloy tube blank (the tube blank is made by conventional method) , the specific processing method is:

[0040]Step 1. The titanium alloy tube billet is cold-rolled three times by using a reciprocating cold-rolling mill to obtain a titanium alloy tube; pickling treatment, and then perform inter-pass annealing treatment on the tube blank after degreasing and pickling treatment, the temperature of the inter-pass annealing treatment is 550°C, and the time is 1h; the deformation of each pass of cold rolling and The ratio Q of inner diameter reduction rate and wall thickness reduction rate is shown in Table 3;

[0041] Table 3 Embodiment 3 The data of each pass of cold rolling

[0042]

[0043] Step 2: Carry out degreasing and pickling treatment on the titanium alloy tube described in...

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Abstract

The invention discloses a method for controlling the precipitation direction of intermetallic compounds in a titanium alloy tube. The method comprises the following steps: I. carrying out 2-6 passes of cold rolling on a titanium alloy tube blank by adopting a reciprocating tube cold rolling mill to obtain the titanium alloy tube; controlling the ratio Q of the inner diameter reducing rate to the wall thickness reduction rate and the deflection in the cold rolling process; II. carrying out oil removal and acid pickling treatment on the titanium alloy tube, then carrying out final annealing treatment on the titanium alloy tube after oil removal and acid pickling treatment and finally straightening the titanium alloy tube after final annealing treatment, thus obtaining the final titanium alloy tube. The method has the advantages that by controlling the ratio Q of the inner diameter reducing rate to the wall thickness reduction rate in the cold rolling process and adopting large wall reduction quantity and small diameter reduction quantity machining, the tissue of the final tube produced through cold rolling undergoes perfect recrystallization and meets the operating requirements on the basis that the precipitation direction of the intermetallic compounds is the circumferential direction of the tube.

Description

technical field [0001] The invention belongs to the technical field of titanium alloy pipes, and in particular relates to a method for controlling the precipitation direction of intermetallic compounds in titanium alloy pipes. Background technique [0002] Titanium has good corrosion resistance, weldability and a good match between strength and plasticity. After adding specific alloying elements (such as Ni, Fe, Cu, etc.) These intermetallic compounds are likely to precipitate. Generally, when the intermetallic compounds precipitate, they will precipitate along the grain boundaries of the metal. When the intermetallic compounds are distributed continuously or in large quantities along the grain boundaries, it will cause the strength, plasticity and Corrosion resistance is greatly reduced. After alloying elements are added to titanium metal pipes, the precipitation of intermetallic compounds along grain boundaries is inevitable. [0003] During the use of the pipe, the inn...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/18
Inventor 杨亚社罗登超马小菊席锦会王莎李刚文周峰南莉韦佩
Owner WESTERN TITANIUM TECH