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Heat treatment process for acquiring tri-model microstructure from double-phase titanium alloy

A titanium alloy and microstructure technology, applied in the field of titanium alloy thermal processing, can solve the problems of narrow working temperature range and inconvenient temperature control, and achieve the effect of wide application range and simple and easy heat treatment process

Inactive Publication Date: 2011-04-06
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problems of relatively narrow working temperature range and inconvenient temperature control in the near-β forging technology for obtaining triple-state titanium alloys, and to provide a method for obtaining triple-state structures in duplex titanium alloys heat treatment process

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  • Heat treatment process for acquiring tri-model microstructure from double-phase titanium alloy
  • Heat treatment process for acquiring tri-model microstructure from double-phase titanium alloy
  • Heat treatment process for acquiring tri-model microstructure from double-phase titanium alloy

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specific Embodiment approach 1

[0009] Specific embodiment 1: The steps of a heat treatment process for obtaining a triple-state structure in a dual-phase titanium alloy in this embodiment are:

[0010] Step 1: the first heat treatment, heating the titanium alloy whose initial structure is a two-state structure to a temperature range of 10 to 30°C lower than the β transformation point and keeping it warm, the temperature of the β transformation point is 1000±20°C, and the holding time is Calculate based on the long side dimension of the largest cross-section of the titanium alloy material, that is, keep warm for 60-300s per 1mm, and quickly put it into the water tank to cool to room temperature after the heat preservation is over;

[0011] Step 2: the second heat treatment, heating the titanium alloy after the first heat treatment to a temperature range of 40-60°C lower than the β transformation point and keeping it warm, the temperature of the β transformation point is 1000±20°C, and the holding time is Add...

specific Embodiment approach 2

[0013] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that in step 1, the titanium alloy whose initial structure is a two-state structure is heated to a temperature lower than the β transformation point by 10°C, and the heat preservation time is determined by the titanium alloy material Calculate the length of the longest side of the largest cross-section, that is, keep warm for 60s per 1mm; in step 2, heat the titanium alloy after the first heat treatment to a temperature lower than the β transformation point of 45°C, and keep warm for 60s per 1mm Add 40 minutes on the basis of

[0014] The heat treatment process curve of this embodiment can be found in Figure 4 , the titanium alloy structure after the first heat treatment is as follows Figure 5 As shown, the three-state structure of the titanium alloy obtained after the second heat treatment is as follows Image 6 As shown, the strength of the obtained three-state titanium allo...

specific Embodiment approach 3

[0015] Specific embodiment 3: The difference between this embodiment and specific embodiment 1 is that in step 1, the titanium alloy whose initial structure is a two-state structure is heated to a temperature lower than the β transformation point of 15°C, and the heat preservation time is determined by the titanium alloy material Calculate the length of the longest side of the largest cross-section, that is, keep the heat for 70s per 1mm; in step 2, heat the titanium alloy after the first heat treatment to a temperature lower than the β transformation point of 40°C, and keep the heat for 70s per 1mm Add 45 minutes on the basis of

[0016] The strength of the triple-state titanium alloy obtained in this embodiment is 1092MPa at room temperature, 750MPa at 500°C, 13.58% elongation at room temperature, and 42.16J / cm impact toughness 2 .

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Abstract

The invention discloses a heat treatment process for acquiring a tri-model microstructure from double-phase titanium alloy, which relates to a heat treatment process for acquiring a tri-model microstructure from titanium alloy. The invention solves the problems of relative narrower operation temperature interval and inconvenient temperature control in a near Beta forging technology for acquiring tri-model microstructure titanium alloy. The heat treatment process comprises the following steps of: the first heat treatment, heating titanium alloy with an initial microstructure as a duplex microstructure to the temperature lower than a Beta conversion point by 10 to 30 DEG C, preserving the temperature with the heat preservation time of 60 to 300s every 1mm, then putting into a water tank, and cooling to room temperature; and the second heat treatment, heating the titanium alloy after the first heat treatment to the temperature lower than the Beta conversion point by 40 to 60 DEG C, and preserving the temperature, wherein the heat preservation time is increased for 30 to 60min on the basis of the heat preservation of the first heat treatment; and then cooling in an air cooling way to obtain the tri-model microstructure titanium alloy. The heat treatment process does not need near Beta heat deformation pretreatment, has wide operation temperature interval, and is convenient to control the temperature.

Description

technical field [0001] The invention relates to a heat treatment process for obtaining a three-state structure in a titanium alloy, and belongs to the technical field of titanium alloy heat processing. Background technique [0002] Titanium alloy has the advantages of high specific strength, good corrosion resistance and high heat resistance, and is an important material in aerospace, petrochemical, biomedical and other fields. For duplex titanium alloys, different microstructures can be obtained by different thermal processing processes. Two-state structure and lamellar structure are two typical structures of duplex titanium alloys. The two-state structure is composed of equiaxed α and β transformation structures. Titanium alloys with two-state structure have good plasticity and thermal stability, but relatively poor high-temperature performance and fracture toughness. Titanium alloys with lamellar structure have relatively poor plasticity and thermal stability, but good ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/18
Inventor 朱景川王洋来忠红韩磊刘勇
Owner HARBIN INST OF TECH
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