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A kind of processing method of tc4-dt titanium alloy bar

A TC4-DT and processing method technology, which is applied in the processing field of TC4-DT titanium alloy bars, can solve the problems of comprehensive matching, disadvantage, poor alloy plasticity, etc., and achieve the effect of improving strength, overall performance and fracture toughness.

Active Publication Date: 2016-06-22
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The TC4-DT titanium alloy bar obtained by the traditional process can obtain high strength, fracture toughness and crack growth rate, but the alloy plasticity is poor, which is not conducive to the comprehensive matching of alloy strength, plasticity and toughness

Method used

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  • A kind of processing method of tc4-dt titanium alloy bar

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Effect test

Embodiment 1

[0018] The processing method of the present embodiment TC4-DT titanium alloy bar comprises the following steps:

[0019] Step 1. Use a 2,500-ton fast forging machine to carry out billet forging on the TC4-DT titanium alloy ingot with a specification of Ф320mm, and obtain the first forging billet after air cooling; the billet forging adopts the forging method of repeatedly upsetting and elongating, It is completed in one fire. The initial forging temperature of blank forging is 165°C above the β transformation point, the final forging temperature of blank forging is 70°C below the β transformation point, and the cumulative deformation of blank forging is 70%; The first forged billet processed in this embodiment is a round billet with a cross-sectional diameter of 175mm;

[0020] Step 2: Use a 2,500-ton fast forging machine to perform intermediate forging on the first forging billet described in step 1, and obtain the second forging billet after air cooling; the intermediate for...

Embodiment 2

[0025] The processing method of the present embodiment TC4-DT titanium alloy bar comprises the following steps:

[0026] Step 1. Use a 2,500-ton fast forging machine to carry out billet forging on the TC4-DT titanium alloy ingot with a specification of Ф460mm, and obtain the first forging billet after air cooling; the billet forging adopts the forging method of repeatedly upsetting and elongating, It is divided into two fires to complete. The initial forging temperature of each billet forging is 180°C above the β transformation point, and the final forging temperature of each billet forging is 80°C below the β transformation point. The cumulative amount of deformation is 80%; the first forging billet processed in this embodiment is a round billet with a cross-sectional diameter of 206mm;

[0027] Step 2: Use a 2,500-ton fast forging machine to perform intermediate forging on the first forging billet described in step 1, and obtain the second forging billet after air cooling; t...

Embodiment 3

[0032] The processing method of the present embodiment TC4-DT titanium alloy bar comprises the following steps:

[0033] Step 1. Use a 1,600-ton hydraulic press to carry out billet forging on the TC4-DT titanium alloy ingot with a specification of Ф460mm, and obtain the first forging billet after air cooling; Completed in one fire, the initial forging temperature of the blank forging is 200°C above the β transformation point, the final forging temperature of the blank forging is 100°C below the β transformation point, and the deformation of the blank forging is 60%; this embodiment The processed first forging billet is a round billet with a section diameter of 290mm;

[0034] Step 2: Use a 1,600-ton hydraulic press to carry out intermediate forging on the first forging billet described in Step 1, and obtain the second forging billet after air cooling; the intermediate forging adopts the forging method of repeated upsetting and elongation, and is completed in two fires , the i...

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Abstract

The present invention provides a TC4-DT titanium alloy rod processing method, which comprises: 1, carrying out cogging forging on a TC4-DT titanium alloy casting ingot to obtain a first forged billet; 2, carrying out middle forging on the first forged billet to obtain a second forged billet; 3, carrying out forming forging on the second forged billet to obtain a rod billet; and 4, carrying out a heat treatment on the rod billet to obtain the TC4-DT titanium alloy rod. With application of the TC4-DT titanium alloy rod processed by the processing method of the present invention, the whole performance can be significantly improved, wherein the elongation rate can be increased by more than 50% compared with the elongation rate of the conventional rod, the fracture toughness can be improved by more than 15% compared with the fracture toughness of the conventional rod, and the good matching in the fields of strength, plasticity and toughness of the TC4-DT titanium alloy material can be achieved well.

Description

technical field [0001] The invention belongs to the technical field of processing titanium alloy materials, and in particular relates to a processing method for TC4-DT titanium alloy rods. Background technique [0002] The development of the aerospace industry must rely on the promotion of advanced materials. In recent years, with the development of fracture mechanics and damage tolerance theory, the design criteria of aircraft components have changed. At present, high damage tolerance titanium alloys have become a research field of titanium alloys. Many studies have proved that titanium alloys can obtain high damage tolerance properties through β forging or β heat treatment, that is, the lamellar structure of titanium alloys has high fracture toughness and low crack growth rate, but β forging or β heat treatment due to The plasticity of the material is significantly reduced due to the coarse lamellar structure. Therefore, in order to improve the damage tolerance performance...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/18
CPCC22F1/18
Inventor 郭萍赵永庆田广民韩栋贾蔚菊雷文光张永强赵恒章侯红苗
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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