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A kind of Widmanstatten titanium alloy with compound lamellar structure and preparation method thereof

A technology of Widmanstatten structure and lamellar structure, which is applied in the field of titanium alloy with Widmanstatten structure and its preparation, can solve the problems of loss of tensile plasticity and fracture toughness, low tensile strength and plasticity of titanium alloy, and achieve plasticity and toughness optimization. , Improve the application potential, improve the effect of the degree of twists and turns

Active Publication Date: 2017-02-15
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The Widmanstatten structure of existing titanium alloys has a common lamellar structure, which is the complete transformation point T of the alloy at the α / β phase. β The tensile strength and plasticity of the Widmanstatten titanium alloy with ordinary lamellar structure obtained through heat treatment above are low, and the method of increasing the cooling rate after solid solution can increase the tensile strength and reduce da / dN to a certain extent, But at the same time, it is accompanied by the loss of tensile plasticity and fracture toughness, and there is a certain limit for the reduction of da / dN

Method used

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  • A kind of Widmanstatten titanium alloy with compound lamellar structure and preparation method thereof
  • A kind of Widmanstatten titanium alloy with compound lamellar structure and preparation method thereof
  • A kind of Widmanstatten titanium alloy with compound lamellar structure and preparation method thereof

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Embodiment 1

[0045] This embodiment is to control and optimize the TC4 titanium alloy whose nominal composition is Ti-6Al-4V. The titanium alloy with ordinary lamellar structure obtained in Comparative Example 1 was heat-treated at 920°C, 940°C, and 960°C, and then air-cooled to room temperature after being kept for 1 hour. When the Widmanstatten structure is heat-treated in the two-phase region, phase transformation occurs first on both sides of the β phase, and part of the α phase transforms into a β phase. After a certain period of time, it is cooled at a certain speed, and the β phase between the original α sheets transforms into fine particles. The secondary α-sheets obtained in the composite sheet structure, that is, there are fine secondary α-sheets between the original coarser α-sheets. The schematic diagram of the composite sheet structure is shown in Figure 7 as shown in (a), Figure 7 (b) is the SEM micromorphology of the composite lamellar structure obtained by heat-treating ...

Embodiment 2

[0052] This embodiment is to control and optimize the TA15 titanium alloy, and the temperature of the α / β phase complete transformation point of the TA15 titanium alloy is 985±5°C. Firstly, the TA15 titanium alloy billet with equiaxed structure was heat treated at 1030° C., and kept for 1 hour to obtain a titanium alloy with ordinary lamellar structure. It is then heat-treated at a temperature of 970°C and held for 1 hour to obtain a titanium alloy with a Widmanstatten structure with a composite lamellar structure. About 70%.

[0053] Table 4 compares the mechanical properties of the Widmanstatten structure between the optimized composite lamellar structure and the common lamellar structure of TA15 titanium alloy. It can be seen that the tensile strength, tensile plasticity, fracture toughness and fatigue crack growth resistance of the composite lamellar structure The ability is comprehensively superior to ordinary lamellar tissue.

[0054] Table 4 Comparison of mechanical p...

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Abstract

The invention discloses a Widmannstatten structure titanium alloy with a composite laminated structure and a preparation method thereof, and belongs to the technical field of titanium alloy comprehensive performance optimization. The preparation method comprises the following steps: choosing a Widmannstatten structure titanium alloy blank with a common laminated structure, subjecting the blank to a heat treatment, wherein the temperature of the heat treatment is 10 to 20 DEG C below the titanium alloy alpha / beta phase complete conversion point; maintaining the temperature for a while, and then cooling the blank to the room temperature in the air or by wind so as to obtain the Widmannstatten structure titanium alloy with a composite laminated structure. In the Widmannstatten structure, fine secondary alpha sheets are distributed between the large and coarse alpha sheets, the special structure can enhance the tensile property and fracture toughness of the Widmannstatten structure, and reduce the fatigue crack growth rate (da / dN) at the same time, and thus the mechanical property of the Widmannstatten structure is optimized. Furthermore, the limitation that exists in the conventional method utilizing a high-speed cooling technology to optimize Widmannstatten structure with a common laminated structure is broken through, and thus the application potential of Widmannstatten structure titanium alloy is improved.

Description

technical field [0001] The invention relates to the technical field of optimizing the comprehensive properties of titanium alloys through heat treatment, in particular to a titanium alloy with a Widmanstatten structure with a composite lamellar structure and a preparation method thereof. The titanium alloy with optimized mechanical properties will have a wider application in the aerospace field. scope of application. Background technique [0002] Due to its high specific strength and excellent corrosion resistance, titanium alloys have been widely used in the fields of aviation, aerospace and ships. The equiaxed structure of titanium alloy has excellent tensile properties and high cycle fatigue properties, and is currently the most widely used microstructure type of titanium alloy. However, titanium alloys with a Widmanstatten structure with coarse original β grains have better damage tolerance performance than equiaxed or bimodal structures, that is, lower fatigue crack gr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/18
Inventor 马英杰雷家峰刘羽寅杨锐
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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