A Cyclic Thermal Hydrogen Treatment Process for Improving Plasticity of tc4 Titanium Alloy at Room Temperature
A treatment process and titanium alloy technology, which is applied in the field of improving room temperature plasticity of TC4 titanium alloy, can solve the problems that the performance cannot meet the needs of production and use, and achieve the effect of lower yield strength ratio, lower yield strength and improved room temperature plasticity
Active Publication Date: 2017-10-03
HEFEI UNIV OF TECH
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Problems solved by technology
[0005] But at present, the existing method of improving the plasticity of TC4 titanium alloy at room temperature by hot hydrogen treatment generally has the problem that the improvement of performance cannot meet the needs of production and use.
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Embodiment 1
[0026] The experimental material used in this embodiment is a TC4 titanium alloy rod with a diameter of 30 mm. The original bar is cut by wire, and a cylindrical sample with a size of Φ4mm×6mm is cut out. The sample is polished with 800# and 1000# sandpaper, cleaned with acetone ultrasonic wave, and dried to ensure that the surface of the sample is free from pollution.
[0027] In order to determine the optimal number of cycles of hydrogenation to improve the plasticity of TC4 titanium alloy at room temperature, three samples were selected in this embodiment, and the three samples were subjected to one hydrogenation treatment, two hydrogenation treatments, and three times hydrogenation treatment. The one-time hydrogenation process is: one-time hydrogenation-solution quenching; the second-time hydrogenation process is: one-time hydrogenation-dehydrogenation-second hydrogenation-solution quenching; the three-time hydrogenation process is: one-time hydrogenation-dehydrogenation- ...
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Abstract
The invention discloses a circulating thermo-hydrogenation treatment technology for improving room temperature plasticity of TC4 titanium alloy. The circulating thermo-hydrogenation treatment technology is characterized in that secondary circulating hydrogen treatment is carried out on the TC4 titanium alloy, in other words, hydrogen is removed after primary hydrogen treatment is carried out on the TC4 titanium alloy; then secondary hydrogen treatment is carried out; and finally solution hardening treatment is conducted. According to the secondary hydrogen treatment method, the proportion of the phase alpha and the phase beta in the TC4 titanium alloy is improved, the content of the phase beta which is good in plasticity in the alloy is increased, the content of the martensite alpha' is reduced, grains are refined, and therefore the room temperature plasticity of the alloy is further improved; and after secondary circulating thermo-hydrogenation treatment, the ultimate deformation rate of the TC4 titanium alloy is increased by 22.1%, the yield strength is reduced by 11.1%, and the yield ratio is reduced by 11.5%.
Description
technical field [0001] The invention relates to a method for improving the plasticity of TC4 titanium alloy at room temperature. Background technique [0002] Titanium is called "the metal of the 21st century". Titanium and titanium alloys have the advantages of light specific gravity, high specific strength, good high temperature performance, strong corrosion resistance, non-toxicity and good biocompatibility. They are widely used in chemical industry, aviation, aerospace, Energy, marine development, medicine and other fields have been widely used. The aviation industry is the earliest field of application of titanium alloys. Due to the increasingly urgent demand for high-strength and low-density materials in the aviation industry, the rapid development of the aviation titanium industry has been greatly promoted. In recent years, the world's titanium industry and titanium processing technology have developed rapidly. The production and consumption of sponge titanium, wroug...
Claims
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IPC IPC(8): C22F1/18
CPCC22F1/183
Inventor 袁宝国张小雪王玉洁郑育彬龚龙清
Owner HEFEI UNIV OF TECH