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A thermal processing method for preparing multi-scale and multi-configuration dual-phase titanium alloy structure

A titanium alloy, multi-configuration technology, applied in the field of hot processing of dual-phase titanium alloys, can solve the problems of complex processing process, unstable metastable phase, unfavorable refined structure, etc., and achieve simple hot processing technology and machinability. Good, easy-to-control effects

Active Publication Date: 2017-08-25
YANSHAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among the above methods, the processing technology of the large plastic deformation method is cumbersome, the efficiency is low, and it is not suitable for the preparation of large-scale products.
The processing process of the prefabricated metastable phase refinement method is complicated, and due to the instability of the metastable phase itself, the processing is difficult, which is not conducive to obtaining a stable refined structure

Method used

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  • A thermal processing method for preparing multi-scale and multi-configuration dual-phase titanium alloy structure
  • A thermal processing method for preparing multi-scale and multi-configuration dual-phase titanium alloy structure

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Embodiment 1

[0023] In an environment with argon as protective gas, a TC4 dual-phase titanium alloy sheet with a thickness of 2mm was heated to 950°C at 25°C / s and kept for 40s, so that the proportion of the two-phase α phase accounted for 60%, and the intergranular β phase accounted for 60%. 40%, and then quickly sent to the rolling mill for rolling, and the compression deformation with a reduction of 1mm was quickly carried out, and the deformation strain rate was 10-12s -1 , After the thermal deformation is completed, spray water to cool, and cool the titanium alloy plate from 950 ° C to room temperature at a cooling rate of 200-250 ° C / s. figure 1 The microstructure diagram of TC4 titanium alloy after deformation. The width of the α lath is measured to be about 0.29 μm, and it is found that the titanium alloy has a better microstructure refinement effect and has a multi-scale and multi-configuration structure.

Embodiment 2

[0025] In the environment with argon as the protective gas, the TC4 dual-phase titanium alloy sheet with a thickness of 2mm was heated to 900°C at 30°C / s and kept for 30s, so that the proportion of the two-phase α phase accounted for 70%, and the intergranular β phase accounted for 70%. 30%, and then quickly sent to the rolling mill for rolling, and the compression deformation with a reduction of 1mm was quickly carried out, and the deformation strain rate was 13-15s -1 , After the thermal deformation is completed, spray water to cool, and cool the titanium alloy sheet from 900 °C to room temperature at a cooling rate of 250-300 °C / s. figure 2 The microstructure diagram of TC4 titanium alloy after deformation. The width of α lath was measured to be about 0.28 μm, and it was found that the effect of microstructure refinement of titanium alloy also existed.

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Abstract

The invention belongs to the field of metal materials and particularly relates to a thermal processing method for preparing a multi-scale and multi-configuration double-phase titanium alloy structure. According to the thermal processing method, the proportion of an Alpha phase to a Beta phase in double-phase titanium alloy is controlled through short-time heating and temperature maintaining so that the double phases are capable of co-coordinating thermal deformation. In a double-phase region, a relatively high deformation speed and a relatively large deformation degree are adopted to perform thermal deformation so that the equiaxial original Alpha phase has a Beta phase change, and finally the equiaxial Alpha phase is changed into a refined structure composed of double-phase laths. Meanwhile, during a water quenching process, a cooling phase change happens inside a Beta lath to form a finer Alpha needle-shaped sub-stable phase. Through the process, a double-phase titanium alloy refined structure with a multi-scale and multi-configuration structure can be obtained finally. The preparation method of the double-phase titanium alloy refined structure has the characteristics of being simple in technological procedures, easy to control, low in energy consumption, high in efficiency and the like.

Description

[0001] Technical field: [0002] The invention relates to a method for processing metal materials, in particular to a method for hot processing of dual-phase titanium alloys. [0003] Background technique: [0004] Titanium alloys have high specific strength, good corrosion resistance and chemical stability, and are widely used in aerospace, biomedical and automotive industries. Among different types of titanium alloys, dual-phase titanium alloys are the most widely used and used in the largest amount. A large number of existing studies have found that refining the titanium alloy structure can greatly improve the strength, fatigue performance and machinability of titanium alloys, and can effectively reduce the cost of titanium alloys. [0005] At present, the reported (published) titanium alloy microstructure refinement methods are mainly divided into two categories: the large plastic deformation method and the β single-phase region heat treatment prefabricated metastable phas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/18C22F1/02
CPCC22F1/02C22F1/183
Inventor 付瑞东荆磊
Owner YANSHAN UNIV
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