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

Ti2 AlNb-based alloy and gamma-TiAl-based alloy dissimilar material brazing postweld heat treatment process

A post-heat treatment, base alloy technology, applied in metal processing equipment, manufacturing tools, welding equipment, etc., can solve the problem that the heat treatment system is not suitable for brazing joints, melting, reducing residual stress of welding joints, etc., to improve the efficiency of heat treatment work , Improve the tensile strength, optimize the effect of microstructure

Active Publication Date: 2020-09-25
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Heat treatment is an effective means to achieve weld microstructure control, but there are three deficiencies in the current post-weld heat treatment: (1) The main purpose of the current post-weld heat treatment is to reduce the residual stress of the welded joint; (2) The element composition of the welded joint is relatively close to that of the base metal, and its heat treatment system is not suitable for brazed joints; (3) Due to the existence of brazing material, the elemental composition, mechanical properties and physical properties of the brazed joint are different from the base metal, and its Heat treatment should not only consider the factors of the base metal, but also the characteristics of the weld itself
For example: if only the factors of the base metal are considered, the heat treatment temperature will be too high, which will melt the low melting point phase in the brazed joint structure, which will not only fail to strengthen the brazed joint, but may also lead to serious accidents

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
  • Ti2 AlNb-based alloy and gamma-TiAl-based alloy dissimilar material brazing postweld heat treatment process
  • Ti2 AlNb-based alloy and gamma-TiAl-based alloy dissimilar material brazing postweld heat treatment process
  • Ti2 AlNb-based alloy and gamma-TiAl-based alloy dissimilar material brazing postweld heat treatment process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] In this example, the Ti 2 AlNb-based alloys and γ-TiAl-based alloys are welded by vacuum brazing, Ti 2 The post-weld heat treatment process of AlNb-based alloy and γ-TiAl-based alloy dissimilar brazing is as follows:

[0039] Put the brazed sample into a vacuum heat treatment furnace and heat it up to 680°C with the furnace, keep it warm for 15 minutes, and the vacuum degree is: 5×10 -3 ~5×10 -4 Pa; then heat up to the heat treatment temperature of 720°C, keep it warm for 3h, and the vacuum degree is: 5×10 -3 ~5×10 -4 Pa; cooled to room temperature with the furnace.

[0040] figure 2 It is the microstructure of the brazed joint after heat treatment at 720°C / 3h, and the tensile strength of the brazed joint at this time is 475MPa. This heat treatment process optimizes the microstructure of the brazed joint and improves its mechanical properties.

Embodiment 2

[0042] In this example, the Ti 2 AlNb-based alloys and γ-TiAl-based alloys are welded by vacuum brazing, Ti 2 The post-weld heat treatment process of AlNb-based alloy and γ-TiAl-based alloy dissimilar brazing is as follows:

[0043] Put the brazed sample into a vacuum heat treatment furnace and heat it up to 700°C with the furnace, keep it warm for 15 minutes, and the vacuum degree is: 5×10 -3 ~5×10 -4 Pa; then heat up to a heat treatment temperature of 750°C, keep warm for 3 hours, and the vacuum degree is: 5×10 -3 ~5×10 -4 Pa; cooled to room temperature with the furnace.

[0044] image 3 It is the microstructure of the brazed joint after heat treatment at 750°C / 3h, and the tensile strength of the brazed joint at this time is 440MPa. This heat treatment process optimizes the microstructure of the brazed joint and improves its mechanical properties.

Embodiment 3

[0046] In this example, the Ti 2 AlNb-based alloys and γ-TiAl-based alloys are welded by vacuum brazing, Ti 2 The post-weld heat treatment process of AlNb-based alloy and γ-TiAl-based alloy dissimilar brazing is as follows:

[0047] Put the brazed sample into a vacuum heat treatment furnace and heat it up to 680°C with the furnace, keep it warm for 15 minutes, and the vacuum degree is: 5×10 -3 ~5×10 -4 Pa; then heat up to a heat treatment temperature of 700°C, keep warm for 5h, and the vacuum degree is: 5×10 -3 ~5×10 -4 Pa; cooled to room temperature with the furnace.

[0048] Figure 4 It is the microstructure of the brazed joint after heat treatment at 700°C / 5h, and the tensile strength of the brazed joint at this time is 450MPa. This heat treatment process optimizes the microstructure of the brazed joint and improves its mechanical properties.

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
tensile strengthaaaaaaaaaa
Login to View More

Abstract

The invention belongs to the technical field of intermetallic compound dissimilar material brazing postweld heat treatment, and particularly relates to a Ti2 AlNb-based alloy and gamma-TiAl-based alloy dissimilar material brazing postweld heat treatment process. The process comprises the steps that (1) vacuum brazing is carried out, and a Ti2 AlNb-based alloy and a gamma-TiAl-based alloy are welded in a vacuum brazing manner; (2) a brazed sample is placed in a vacuum heat treatment furnace to be heated to the temperature lower than the heat treatment temperature by 10 DEG C to 50 DEG C along with the furnace, and heat preservation is carried out for 5 min to 20min; (3) then the temperature is increased to the heat treatment temperature of 650 DEG C to 850 DEG C, and heat preservation is carried out for 1h to 18h; and (4) furnace cooling is carried out to the room temperature. According to the heat treatment process, the microstructure optimization of a brazed joint is achieved, and themechanical performance of the brazed joint is improved.

Description

technical field [0001] The invention belongs to the technical field of post-welding heat treatment of intermetallic compounds, and specifically relates to a Ti 2 Post-weld heat treatment process for AlNb-based alloy and γ-TiAl-based alloy dissimilar brazing. Background technique [0002] As we all know, the engine is the heart of various aircraft, and the biggest constraint on its development is the development of aviation and aerospace engine materials. Due to the harsh service conditions of engines in the aviation and aerospace fields, this requires materials not only to have excellent room temperature performance, but also to have excellent high temperature performance. At the same time, the material must have good processing performance and high specific strength, so as to facilitate the processing of parts and reduce the specific gravity of components. [0003] Nickel-based superalloys have high specific strength, good oxidation resistance, excellent thermal corrosion...

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 Applications(China)
IPC IPC(8): B23K1/008B23K3/08
CPCB23K1/008B23K3/08
Inventor 蔡雨升吉海宾赵子博王清江崔玉友雷家峰杨锐
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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