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Processing method for raising strength and toughness of TC4-DT titanium alloy sheet materials

A TC4-DT and processing method technology, which is applied in the processing field of improving the strength and toughness of TC4-DT titanium alloy sheets, can solve problems such as unfavorable fracture toughness fatigue crack growth resistance, overall plasticity and toughness improvement, and unfavorable alloy strength, etc. Reduce deformation dead zone, increase crystalline core, no anisotropy effect

Active Publication Date: 2013-10-23
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

From the perspective of damage tolerance, the equiaxed structure is not conducive to improving the fracture toughness and fatigue crack growth resistance of the material. Although the Widmanstatten structure can be obtained by β heat treatment to improve the fracture toughness of the material, due to the coarse β grains and grain boundary α The existence of the phase leads to poor plasticity of the alloy, which is not conducive to the improvement of the overall performance of the alloy's strength, plasticity and toughness

Method used

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  • Processing method for raising strength and toughness of TC4-DT titanium alloy sheet materials
  • Processing method for raising strength and toughness of TC4-DT titanium alloy sheet materials
  • Processing method for raising strength and toughness of TC4-DT titanium alloy sheet materials

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Embodiment 1

[0027] The processing method that present embodiment improves the toughness of TC4-DT titanium alloy plate comprises the following steps:

[0028]Step 1. Use a 1600-ton hydraulic press to carry out blank forging of the TC4-DT titanium alloy ingot, and obtain the first forging billet after water cooling; the cross-sectional shape of the TC4-DT titanium alloy ingot is a circle with a diameter of 460mm; the The billet forging is divided into 1 fire, the forging ratio of the billet forging is 3.1, the final forging temperature of the billet forging is not lower than 900°C, and the TC4-DT titanium alloy ingot is cast before the billet forging Carry out the first-stage heat treatment, the temperature of the first-stage heat treatment is 1100°C to 1150°C, the holding time of the first-stage heat treatment is 276min; the cross-sectional shape of the first forged blank is 230mm in side length the square;

[0029] Step 2. Use a 1600-ton hydraulic press to carry out the first upsetting ...

Embodiment 2

[0039] The processing method that present embodiment improves the toughness of TC4-DT titanium alloy plate comprises the following steps:

[0040] Step 1. Use a 2,500-ton hydraulic press to carry out blank forging of the TC4-DT titanium alloy ingot, and obtain the first forging billet after water cooling; the cross-sectional shape of the TC4-DT titanium alloy ingot is a circle with a diameter of 610mm; the The billet forging is divided into 2 fires to complete, the forging ratio of each billet forging is 2.2, the final forging temperature of each billet forging is not lower than 900 ℃, and each fire The TC4-DT titanium alloy ingot is subjected to the first-stage heat treatment, the temperature of the first-stage heat treatment is 1150°C, and the heat preservation time of the first-stage heat treatment is 480min; the cross-sectional shape of the first forged billet is A square with a side length of 250 mm;

[0041] Step 2. Use a 2,500-ton hydraulic press to carry out the first...

Embodiment 3

[0051] The processing method that present embodiment improves the toughness of TC4-DT titanium alloy plate comprises the following steps:

[0052] Step 1. Use a 2000-ton hydraulic press to carry out blank forging of the TC4-DT titanium alloy ingot, and obtain the first forging billet after water cooling; the cross-sectional shape of the TC4-DT titanium alloy ingot is a circle with a diameter of 560 mm; the The billet forging is divided into 2 fires to complete, the forging ratio of each billet forging is 1.8, the final forging temperature of each billet forging is not lower than 900 ℃, and each fire The TC4-DT titanium alloy ingot is subjected to the first-stage heat treatment, the temperature of the first-stage heat treatment is 1130° C., and the holding time of the first-stage heat treatment is 390 min; the cross-sectional shape of the first forged billet is A square with side length 280;

[0053] Step 2. Use a 2000-ton hydraulic press to carry out the first upsetting forgi...

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Abstract

The invention provides a processing method for raising strength and toughness of TC4-DT titanium alloy sheet materials. The method comprises the following steps: first, TC4-DT titanium alloy ingot castings are subjected to cogging forging to obtain first forging stocks; second, the first forging stocks are subjected to first upsetting forging to obtain second forging stocks; third, the second forging stocks are subjected to second upsetting forging to obtain third forging stocks; fourth, the third forging stocks are subjected to drawing forging to obtain fourth forging stocks; fifth, the fourth forging stocks are subjected to saw cutting blanking, heated, and subjected to plate slab pressing forging to obtain semi-finished product sheet materials with a thickness of 31mm-56mm; sixth, the semi-finished product sheet materials are subjected to heat treatment and machine processing treatment to obtain TC4-DT titanium alloy sheet materials with a thickness of 25mm-50mm. The processed TC4-DT titanium alloy sheet materials have advantages of uniform structure properties, good match of strength, plasticity and toughness, good batch stability and good comprehensive properties.

Description

technical field [0001] The invention belongs to the technical field of titanium alloy material processing, and in particular relates to a processing method for improving the strength and toughness of TC4-DT titanium alloy plates. Background technique [0002] Titanium alloy has excellent characteristics such as low density, high specific strength, good corrosion resistance and high heat resistance, and has become an important structural material for applications in aviation, aerospace, ships and other fields. In recent years, with the widespread application of damage tolerance criteria in the design of structural materials, the development of damage-tolerant titanium alloys has become the focus of research in various countries. A number of damage-tolerant titanium alloys with high fracture toughness and fatigue crack growth resistance have been developed at home and abroad, such as Ti-6Al-4V ELI and Ti-62222S in the United States and TC2l and TC4-DT independently developed i...

Claims

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Application Information

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IPC IPC(8): C22F1/18
Inventor 雷文光毛小南洪权赵永庆韩栋郭萍李磊张永强贾蔚菊
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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