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

A Heat Treatment Method for Obtaining High Toughness and High Damage Tolerance Duplex Titanium Alloy

A heat treatment method and damage tolerance technology, which is applied in the field of titanium alloys, can solve the problems of difficulty in balancing strength, toughness and damage tolerance performance, deterioration of titanium alloy toughness and damage tolerance performance, and reduction of alloy strength, so as to improve toughness and damage tolerance properties, low fatigue crack growth rate, and high fracture toughness

Active Publication Date: 2021-10-01
北京煜鼎增材制造研究院股份有限公司
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The most widely used high toughness and high damage tolerance titanium alloy in foreign countries is TC4ELI, and the high toughness and high damage tolerance titanium alloy used in my country is TC4DT. High damage tolerance characteristics, due to the reduction of oxygen and nitrogen elements, the strength of the alloy is reduced, and its ultimate strength is less than 900MPa
Since the strength of titanium alloys mainly depends on the increase of alloying elements, the toughness and damage tolerance performance of titanium alloys with high alloying element content often deteriorate, and it is difficult to balance strength, toughness and damage tolerance performance.
Therefore, there are obvious limitations in the idea of ​​adjusting the damage tolerance performance of titanium alloys by composition.

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The material of this embodiment is additively manufactured TC11 titanium alloy, the maximum thickness of which is 20mm, and its β transformation temperature T β The temperature is 1010°C, adopt the following high-temperature heat treatment process: 1007°C, heat preservation for 0.5 hours, and control the cooling rate at 20±5°C / sec within the temperature range of cooling to 800°C. Additively manufactured TC11 titanium alloy material after treatment, room temperature strength R m 1070MPa; room temperature fracture toughness K IC 115MPa·m 1 / 2 , which is about 53% higher than that before treatment; the fatigue crack growth rate da / dN in the steady-state region is significantly lower than that before treatment, when Δ K =15 MPa·m 1 / 2 , da / dN decreased by about 53%.

Embodiment 2

[0019] The material of this embodiment is TC11 titanium alloy forging, its maximum thickness is 40mm, and its β transformation temperature T β The temperature is 1010°C, the original structure is forged two-state structure, and the following pretreatment process is adopted: at 1020°C, heat preservation for 1 hour, and the cooling rate is controlled at 150±20°C / s; then high-temperature heat treatment, high-temperature heat treatment process: 1007°C, heat preservation 0.5 Hours, the cooling rate is controlled at 20±5°C / sec in the temperature range of high temperature cooling to 800°C. After treatment, TC11 titanium alloy forgings, room temperature strength R m 1060MPa, room temperature fracture toughness K IC 105MPa·m 1 / 2 , which is about 38% higher than that before treatment; the fatigue crack growth rate da / dN in the steady-state region is significantly lower than that before treatment, when Δ K =15 MPa·m 1 / 2 , da / dN decreased by about 39%.

Embodiment 3

[0021] The material of this embodiment is TC4 titanium alloy casting, its maximum thickness is 18mm, and its β transformation temperature T β The temperature is 995°C, the original tissue is Widmanstatten tissue, and the following high-temperature heat treatment process is adopted: 992°C, heat preservation for 1 hour, and the cooling rate is controlled at 30±5°C / sec within the temperature range of high temperature cooling to 790°C. Treated TC4 casting, room temperature strength R m 905MPa, room temperature fracture toughness K IC 90.5MPa·m 1 / 2 , which is about 15% higher than that before treatment; the fatigue crack growth rate in the steady-state region is significantly lower than that before treatment, when Δ K =15 MPa·m 1 / 2 , da / dN decreased by about 28%.

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
strengthaaaaaaaaaa
strengthaaaaaaaaaa
strengthaaaaaaaaaa
Login to View More

Abstract

The invention discloses a heat treatment method for obtaining a dual-phase titanium alloy with high toughness and high damage tolerance, which includes: high temperature annealing treatment, and the process is: T 1 Temperature, keep warm for 0.1~2 hours, the cooling rate needs to be reasonably controlled, preferably, from T 1 Cool to T β The temperature range of ‑200°C is controlled at 2~50°C / sec, where T 1 The value range is T β ‑10°C to T β Between, T β is the β-transition temperature of the duplex titanium alloy. The method realizes the improvement of the toughness and damage tolerance performance of the dual-phase titanium alloy by controlling the heat treatment temperature and the cooling rate. This method can be used for dual-phase titanium alloys with two structures at room temperature such as TC11, TA15, TC4, TC17, TC18, etc., and is not limited by the original manufacturing process of titanium alloys. For the above-mentioned dual-phase titanium alloy forgings, castings, weldments and Additively manufactured parts are applicable.

Description

technical field [0001] The invention relates to the field of titanium alloys, in particular to a heat treatment method for obtaining a dual-phase titanium alloy with high toughness and high damage tolerance. Background technique [0002] Based on the damage tolerance design concept of structural safety, structural materials such as titanium alloys are developed in the direction of high toughness and high damage tolerance. Titanium alloys with high toughness and high damage tolerance have become the focus of research in the field of titanium alloys. The most widely used high toughness and high damage tolerance titanium alloy in foreign countries is TC4ELI, and the high toughness and high damage tolerance titanium alloy used in my country is TC4DT. High damage tolerance characteristics, due to the reduction of oxygen and nitrogen elements, the strength of the alloy is reduced, and its ultimate strength is less than 900MPa. Since the strength of titanium alloys mainly depends o...

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): C22F1/18
CPCC22F1/183
Inventor 不公告发明人
Owner 北京煜鼎增材制造研究院股份有限公司
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