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Two-phase titanium alloy microscopic structure refining method

A microstructure and titanium alloy technology, applied in the field of material science, can solve the problems of brittle materials, high equipment and process requirements, and achieve the effect of simple operation, low equipment requirements, and easy promotion.

Active Publication Date: 2017-07-07
泰州学院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

SPD and ECAP are two very effective processes for refining structures, but they have high requirements for equipment and processes, and there are also some problems, such as: the crystallized material is very brittle due to the existence of intermetallic compounds

Method used

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  • Two-phase titanium alloy microscopic structure refining method
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  • Two-phase titanium alloy microscopic structure refining method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Take the 18mm slab processed by TC21 titanium alloy, raise the furnace temperature to 980°C, put the slab in the furnace for 10 minutes, and quench it in water to obtain a small and uniform equiaxed β crystal containing fine needle α phase. Granules (see attached Figure 1a , 1b ). Then put the slab in the electric resistance furnace, heat it for 10 minutes at a deformation temperature of 920°C for a short time, and then quickly roll it once. The deformation in the first pass is not less than 50%. After 50%, 65%, 80 After % deformation, water quenching, TC21 obtained a fine microstructure, after subsequent heat treatment, TC21 microstructure into a fine equiaxed structure, see attached figure 2 .

Embodiment 2

[0028] Take the 18mm slab processed by TC21 titanium alloy, raise the furnace temperature to 980°C, put the slab into the furnace and keep it warm for 10 minutes, quench it in water, and then preheat it in the resistance furnace, that is, keep it at the deformation temperature of 890°C for 10 Minutes, and then rapid one-fire rolling, the deformation of the first pass is not less than 50%, after 50%, 65%, 80% deformation, water quenching, TC21 has a fine microstructure, after subsequent heat treatment , TC21 microstructure is finer, see attached image 3 .

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Abstract

The invention discloses a two-phase titanium alloy microscopic structure refining method. The two-phase titanium alloy microscopic structure refining method comprises the steps that firstly, a blank is subjected to short-time heat preservation at the temperature 10-20 DEG C higher than the transformation temperature and then cooled quickly; secondly, the blank is subjected to hot / warm processing at the temperature 50-80 DEG C lower than the transformation temperature and then cooled rapidly; and finally, an equiaxed structure alpha which is fine and uniform is obtained. The two-phase titanium alloy microscopic structure refining method is simple and easy to implement, and low in cost, and the fine and uniform microscopic structure can be obtained and is not prone to being cracked.

Description

technical field [0001] The invention belongs to the technical field of material science, and in particular relates to a preparation process of a titanium alloy with a fine equiaxed structure, in particular to a method for refining the microstructure of a two-phase titanium alloy. Background technique [0002] Titanium alloys are widely used in the aerospace field due to their excellent properties. In order to further tap the potential of titanium alloys, scholars at home and abroad have conducted unremitting research on it, among which microstructure refinement is one of the effective methods to improve metals and alloys. At present, there are many methods for refining titanium alloys, for example: through thermal hydrogen treatment, cyclic heat treatment, and deformation heat treatment, the grains of titanium alloys can be refined to the micron level; Severe plastic deformation (SPD) and equal-channel angular pressing (ECAP) means, Both can refine the structure of Ti-6Al-4...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/18
CPCC22F1/002C22F1/183
Inventor 王临茹赵永庆周廉赵振江沈春龙宋向前王健郭沁函蒋辉琴
Owner 泰州学院