a ti 2 Alnb-based alloy and γ-tial-based alloy dissimilar material brazing post-weld heat treatment process

A post-heat treatment, base alloy technology, applied in metal processing equipment, welding equipment, manufacturing tools, 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 tensile strength, optimize the effect of microstructure

Active Publication Date: 2022-02-18
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • 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

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  • a ti <sub>2</sub> Alnb-based alloy and γ-tial-based alloy dissimilar material brazing post-weld heat treatment process
  • a ti <sub>2</sub> Alnb-based alloy and γ-tial-based alloy dissimilar material brazing post-weld heat treatment process
  • a ti <sub>2</sub> Alnb-based alloy and γ-tial-based alloy dissimilar material brazing post-weld 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.

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Abstract

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 of AlNb-based alloy and γ‑TiAl-based alloy dissimilar brazing. The process includes steps: (1) vacuum brazing: Ti 2 AlNb-based alloys and γ‑TiAl-based alloys are welded by vacuum brazing; (2) Put the brazed samples into a vacuum heat treatment furnace and heat it up to 10°C to 50°C lower than the heat treatment temperature, and keep it warm for 5 to 20 minutes ; (3) Then heat up to the heat treatment temperature of 650°C to 850°C and keep it warm for 1 to 18h; (4) Cool down to room temperature with the furnace. This heat treatment process optimizes the microstructure of the brazed joint and improves its mechanical properties.

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

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/18
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
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