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Heat treatment method for regulating and controlling microstructure and microhardness of near-beta titanium alloy

A heat treatment method and microstructure technology, applied in the field of titanium alloy processing, to achieve the effects of improving mechanical properties and functional properties, improving stability, and improving alloy performance

Active Publication Date: 2021-01-12
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • Heat treatment method for regulating and controlling microstructure and microhardness of near-beta titanium alloy
  • Heat treatment method for regulating and controlling microstructure and microhardness of near-beta titanium alloy
  • Heat treatment method for regulating and controlling microstructure and microhardness of near-beta titanium alloy

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

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Abstract

The invention relates to a heat treatment method for regulating and controlling a microstructure and a microhardness of a near-beta titanium alloy, which comprises the following steps: S1, selecting heat treatment raw materials, and carrying out cogging forging treatment on an alloy cast ingot to form a bar; S2, performing solid solution treatment, specifically, after a heat treatment furnace is heated to + / -50 DEG C near a titanium alloy beta phase transformation temperature of the bar, putting the bar in the heat treatment furnace to be subjected to heat preservation, then quenching the bar,thereby obtaining a sample with a large number of metastable beta phases; and S3, performing subsequent heat treatment, specifically, slowly heating the sample from the room temperature, introducingexternal elastic tensile stress or compressive stress in the heating process, and quenching after the sample reaches the preset temperature. Elastic stress fields act on the Ti-7333 alloy in the heattreatment process, so that refined regulation and control over the microstructure of the Ti-7333 alloy can be achieved, i.e., preferred orientation of an alpha precipitated phase is formed, and the effect of enhancing the microhardness of the near-beta titanium alloy Ti-7333 is achieved.

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 Applications(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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