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A kind of preparation method of tc20 titanium alloy fine-grained bar
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A TC20 and titanium alloy technology, applied in the field of preparation of TC20 titanium alloy fine-grained rods, can solve the problems of uneven lateral microstructure and coarse grains, and achieve the effect of fine and uniform lateral structure
Active Publication Date: 2018-05-08
西部超导材料科技股份有限公司
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[0004] The purpose of the present invention is to provide a method for preparing TC20 titanium alloy fine-grained rods, which is used to prepare TC20 titanium alloy fine-grained rods with a diameter of Φ8 to Φ15 mm, which solves the problem of lateral rolling produced by the conventional rolling production process of TC20 rods with a thickness of Φ8 to Φ15 mm. The problem of uneven microstructure and coarse grains
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[0024] A kind of preparation method of TC20 titanium alloy fine-grained bar of the present invention specifically comprises the following steps:
[0025] Step 1. Select the TC20 titanium alloy rod forging billet with uniform longitudinal and transverse structures, place it in a stepping resistance furnace, heat it at 20°C to 40°C below the phase transition point, and keep it fully warm in the furnace for more than 70 minutes. Single-fire multi-pass precision forging process, the deformation of each pass is 20% to 35%, and the cumulative deformation is 70% to 80%;
[0026] Step 2: Heat the fine forged bar obtained in step 1 in a stepping resistance furnace, the heating temperature is selected at 70°C to 100°C below the phase transition point, the furnace is fully kept warm, and the holding time is more than 50min, using a single fire Rolling and processing on the tandem rolling mill for multiple passes, the deformation of each pass is 25% to 40%, and the cumulative deformation ...
Embodiment 1
[0031] Step 1: Select a TC20 titanium alloy bar forging billet with a specification of Φ90mm and uniform longitudinal and transverse structures, place it in a stepping resistance furnace, heat it at 990°C, keep it warm for 70min, and fine forge it to Φ45mm (cumulative deformation amount 70%), the amount of deformation per pass is 20% to 31%;
[0032] Step 2, heat the finely forged bar obtained in step 1 in a step-by-step resistance furnace at a heating temperature of 920°C, keep it warm for 50 minutes, and roll it to Φ10.5mm (accumulative deformation 94%) by 1 heat, The amount of deformation per pass is 25% to 35%;
[0033] In step 3, heat-treat the bar rolled in step 2 at 830° C. for 1 h, and then straighten and polish it to obtain a TC20 titanium alloy fine-grained bar with a diameter of 10.5 mm.
Embodiment 2
[0035] Step 1. Select a TC20 titanium alloy bar forging billet with a specification of Φ110mm and uniform longitudinal and transverse structures, place it in a stepping resistance furnace, heat it at 970°C, keep it warm for 150min, and finish forging it to Φ55mm (cumulative deformation amount of 75%), the amount of deformation per pass is 25% to 35%;
[0036] Step 2, heat the finely forged bar obtained in step 1 in a step-by-step resistance furnace, the heating temperature is 930°C, keep it warm for 70 minutes, and roll it to Φ8.0mm (cumulative deformation 98%) by 1 heat, The amount of deformation per pass is 30% to 40%;
[0037] In step 3, heat-treat the bar rolled in step 2 at 800° C. for 1.5 h, and then straighten and polish it to obtain a TC20 titanium alloy fine-grained bar with a diameter of 8 mm.
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Abstract
The invention discloses a preparing method of TC20 titaniumalloyfine grain bars. TC20 titaniumalloyforging stocks with the uniform longitudinal and transverse structures are selected and are placed in a stepping type resistance furnace, high-temperature heating is carried out below the phase change point, and one-heating-number multi-pass rolling is adopted to carry out fine forging on the forging stocks; below the phase change point, the forging stocks subject to fine forging in the step one are heated in the stepping type resistance furnace, and single-heating-number multi-pass rolling is carried out; finally, the forging stocks are subject to heat treatment, straightening and polishing, and the TC20 titaniumalloyfine grain bars are obtained. According to the method, the TC20 titanium alloyfine grain bars with the uniform transverse structure of phi 8mm to phi 15mm can be produced. Compared with bars produced through a conventional rolling technology, the transverse structure of the bars is fine and uniform, the A1-A3 level of the GB / T13810-2007 standard diagrams is met, and various properties also meet the standard requirement of TC20 bars for surgical implants.
Description
technical field [0001] The invention belongs to the technical field of titanium alloy material processing, and in particular relates to a preparation method of a TC20 titanium alloy fine-grained rod. Background technique [0002] TC20 (nominal composition Ti-6Al-7Nb) titanium alloy has the characteristics of low density, suitable strength and high fatigue strength, as well as excellent biocompatibility, corrosion resistance and processability, and is widely used as biomedical materials . [0003] GB / T 13810-2007 stipulates the microstructure of TC20 titanium alloy for surgical implants: it is α+β structure, and it should meet the A1-A9 level of the map. Some medical device manufacturers require the structure of Φ8~Φ15mm TC20 titanium alloy rods to meet the A1-A3 level of the map. The process performance of TC20 titanium alloy is not good. The traditional thermal processing process can obtain equiaxed α+β transformation structure, which can meet the A5-A9 level of the stand...
Claims
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