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A heat treatment method for controlling microstructure and microhardness of near-β titanium alloy

A heat treatment method and microstructure technology are applied in the field of titanium alloy processing to achieve the effect of improving stability

Active Publication Date: 2022-02-15
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the traditional heat treatment process is difficult to fully realize the precise control of the microstructure and mechanical properties.

Method used

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  • A heat treatment method for controlling microstructure and microhardness of near-β titanium alloy
  • A heat treatment method for controlling microstructure and microhardness of near-β titanium alloy
  • A heat treatment method for controlling microstructure and microhardness of near-β titanium alloy

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] After the Ti-7333 alloy after billet forging was subjected to solid solution treatment at 900°C / 30min (the temperature of the heat treatment furnace was 900°C, and the holding time was 30min), a sample was formed. The microstructure of the sample was as follows: figure 1 , where the tissue feature is full-β tissue with isometric tissue features.

[0047] Then the sample is raised from room temperature to 700°C at a heating rate of 5°C / min, and different elastic tensile stresses are applied to the sample. At this time, the microstructure of the sample is as follows: Figure 2-4 shown, where figure 2 is the microstructure characteristics of the sample (Ti-7333 alloy) in the unstressed state, image 3 is the microstructure characteristics of the sample (Ti-7333 alloy) under the state of 20MPa tensile stress, Figure 4 It is the microstructure characteristics of the sample (Ti-7333 alloy) under the state of 20MPa compressive stress.

[0048] No elastic stress is applied...

Embodiment 2

[0050] After the Ti-7333 alloy that has been forged by blanking is subjected to solution treatment at 900°C / 30min (the temperature of the heat treatment furnace is 900°C, and the holding time is 30min), the sample is formed, and then the sample is heated at a heating rate of 10°C / min. Raise to 700°C, and apply different elastic tensile stresses to the sample; among them, such as Figure 5 Shown is the microstructure characteristics of the sample (Ti-7333 alloy) under no stress; as Figure 6 Shown is the microstructure characteristics of the sample (Ti-7333 alloy) under the action of 20MPa compressive stress; as Figure 7 Shown is the microstructure characteristics of the sample (Ti-7333 alloy) under the action of 50MPa compressive stress.

[0051] Such as Figure 5 The grain size of the short rod-shaped α phase precipitated in the stress-free state is about 218-425 μm; Figure 6 As shown, under the action of 20MPa compressive stress, in the direction parallel to the applied...

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Abstract

The invention relates to a heat treatment method for regulating the microstructure and microhardness of a near-β titanium alloy, comprising the following steps: S1: selecting heat treatment raw materials, and subjecting alloy ingots to blank forging to form rods; S2: solid solution treatment After heating the heat treatment furnace to the titanium alloy β phase transition temperature of the rod to ±50 ° C, the rod is placed in the heat treatment furnace for heat preservation, and then the rod is quenched to obtain a large amount of metastable β phase Sample; S3: Subsequent heat treatment, the sample is slowly heated from room temperature, and an external elastic tensile or compressive stress is introduced during the heating process. When the sample reaches the predetermined temperature, it is quenched. This application has the ability to apply the elastic stress field to the heat treatment. The Ti-7333 alloy in the process can realize the fine control of the microstructure of the Ti-7333 alloy, that is, the formation of the preferred orientation of the α-precipitated phase, and the effect of improving the microhardness of the near-β titanium alloy Ti-7333.

Description

technical field [0001] The invention belongs to the technical field of titanium alloy processing, and in particular relates to a heat treatment method for controlling the microstructure and microhardness of a near-beta titanium alloy. Background technique [0002] Titanium and titanium alloys have excellent comprehensive properties such as high specific strength, high specific modulus, high toughness, high damage tolerance, antimagnetic and good corrosion resistance, and are one of the important materials for the preparation of large aerospace structural parts. At present, the commonly used high-strength titanium alloys in the world mainly include metastable β-type alloys and near-β-type titanium alloys. The alloy whose β transformation point is lower than room temperature, among them, the metastable β titanium alloy contains enough β stable elements, and the small-sized sample can retain the full β phase without martensitic transformation. This type of alloy has medium str...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/18B21J5/00
CPCC22F1/183C22F1/002B21J5/002
Inventor 樊江昆陈蓬唐璐瑶李金山寇宏超唐斌赖敏杰王军陈彪王毅薛祥义赵瑞峰
Owner NORTHWESTERN POLYTECHNICAL UNIV
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