Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A heat treatment method for electric arc additive manufacturing of high-strength titanium alloy and a reinforced high-strength titanium alloy

A heat treatment method and additive manufacturing technology, applied in the field of titanium alloys, can solve problems such as complex manufacturing process, large grain size, and complex forming

Active Publication Date: 2021-09-28
BEIJING INSTITUTE OF TECHNOLOGYGY +1
View PDF8 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional titanium alloy forging process has low material utilization rate, long production cycle and complicated manufacturing process. The use of additive manufacturing technology can directly realize the near-net shape of the material, which reduces the manufacturing time and saves production costs. Among them, the arc additive manufacturing technology Mainly used in forming complex large structural parts
[0003] The high-strength titanium alloy formed by arc additive manufacturing technology, in the process of gradually melting and depositing the wire with the arc as the heat source, due to the complex thermal cycle process, residual stress is generated inside the titanium alloy structure, resulting in titanium alloy materials with relatively high strength. Low strength and poor low plasticity, etc., the comprehensive mechanical properties decrease
[0004] In the prior art, heat treatment is usually used to improve the mechanical properties of titanium alloys, but the existing heat treatment methods are usually aimed at titanium alloy castings and forgings. The microstructures of titanium alloy forgings and castings are generally equiaxed, and the grains are smaller. Small, the heat treatment process is usually carried out in the α-phase region, and the mechanism is to break the continuous grain boundaries through heat treatment to improve the mechanical properties; and in the process of obtaining titanium alloys by arc additive manufacturing, due to the solidification during the layer-by-layer lapping process And remelting, "bamboo-shaped" β grains will be produced, and the grain size is larger. Therefore, the structure of titanium alloys obtained by arc additive manufacturing is different from that of conventional titanium alloy castings and forgings. Titanium alloys The heat treatment process of castings and forgings is not suitable for high-strength titanium alloys obtained by arc additive manufacturing
In the prior art, there is no report on a heat treatment method suitable for high-strength titanium alloys obtained by arc additive manufacturing

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A heat treatment method for electric arc additive manufacturing of high-strength titanium alloy and a reinforced high-strength titanium alloy
  • A heat treatment method for electric arc additive manufacturing of high-strength titanium alloy and a reinforced high-strength titanium alloy
  • A heat treatment method for electric arc additive manufacturing of high-strength titanium alloy and a reinforced high-strength titanium alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] (1) Preparation of TC11 high-strength titanium alloy sample:

[0044] Use TC11 high-strength titanium alloy wire with a diameter of 1.2mm as raw material to prepare TC11 high-strength titanium alloy sample. Specifically, connect the positive electrode of a hot wire power supply at a distance of 30cm from the melting end of the TC11 high-strength titanium alloy wire, and connect the hot wire The negative pole of the power supply is connected to the workbench to provide auxiliary heating for the TC11 high-strength titanium alloy wire during the arc additive manufacturing process. The specific arc additive manufacturing parameters are as follows:

[0045] The peak current is 220A; the peak current time ratio is 15%; the base value current is 15% of the peak current; the frequency is 1.5Hz; the scan rate is 250mm / min; the wire feeding speed is 150cm / min; the layer height is 1.0mm; The hot wire current is 100A;

[0046] The size of the obtained sample is 175mm×50mm×80mm;

...

Embodiment 2

[0053] (1) Preparation of TC18 high-strength titanium alloy sample:

[0054] Prepare the TC18 high-strength titanium alloy sample according to the method of Example 1, the only difference is that the TC11 high-strength titanium alloy wire is replaced by the TC18 high-strength titanium alloy wire;

[0055] (2) Heat treatment:

[0056] The β phase transition point of TC18 high-strength titanium alloy is 880°C. The TC18 high-strength titanium alloy sample obtained in step (1) was heated to 900°C with the furnace at a heating rate of 10°C / min, kept for 30 minutes, and then heated at a temperature of 8°C / min. The cooling rate was cooled to 820°C with the furnace, kept for 1 hour, then air-cooled to room temperature, and then heated to 500°C with the furnace at a rate of 10°C / min and held for 6 hours, and then air-cooled to room temperature to obtain a reinforced TC18 high-strength titanium alloy.

[0057] image 3 The microstructure figure of the TC18 high-strength titanium alloy...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
phase transition temperatureaaaaaaaaaa
phase transition temperatureaaaaaaaaaa
heightaaaaaaaaaa
Login to View More

Abstract

The invention provides a heat treatment method for manufacturing a high-strength titanium alloy by electric arc additive manufacturing and a reinforced high-strength titanium alloy, which belong to the field of titanium alloys. In the present invention, after the first heat treatment is performed on the high-strength titanium alloy manufactured by arc additive material, the first cooling is performed to the temperature of the second heat treatment, and the second heat treatment is performed; then the second cooling is performed to room temperature, and then the temperature is raised to the temperature of the third heat treatment to perform the third heat treatment. ; The temperature of the first heat treatment is 10-30°C above the β-transition point of the high-strength titanium alloy produced by arc-added materials, and the time is 15-30 minutes; the temperature of the second heat-treatment is below the β-transition point of the high-strength titanium alloy produced by arc-added materials 40-75°C, the time is 1h; the temperature of the third heat treatment is 500-550°C, and the time is 4-6h. The high-strength titanium alloy treated by the heat treatment method provided by the invention produces a "feather-like" grain boundary α phase at the grain boundary, which prevents intergranular fracture during stretching and can remove residual stress in the titanium alloy.

Description

technical field [0001] The invention belongs to the field of titanium alloys, and in particular relates to a heat treatment method for manufacturing high-strength titanium alloys by electric arc additive materials and a reinforced high-strength titanium alloy. Background technique [0002] As a material with low density, high medium and high temperature strength, and excellent comprehensive mechanical properties, titanium alloy has extremely broad application prospects and is a very important structural material in the aerospace industry. The traditional titanium alloy forging process has low material utilization rate, long production cycle and complicated manufacturing process. The use of additive manufacturing technology can directly realize the near-net shape of the material, which reduces the manufacturing time and saves production costs. Among them, the arc additive manufacturing technology It is mainly used for forming complex large structural parts. [0003] The high...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/18B22F3/24B33Y40/20B33Y80/00
CPCB22F3/24B22F2003/248B33Y80/00B33Y40/20C22F1/183
Inventor 刘长猛崔一南沙昊方岱宁
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com