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Optimization Method of Forging Process Parameters for Hydrogenated tc4 Titanium Alloy
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An optimization method and technology of process parameters, applied in the direction of metal processing equipment, etc., can solve the problems of poor practicability and achieve the effect of improving the tensile strength at room temperature
Active Publication Date: 2017-08-08
南京三航智能制造科技有限公司
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[0006] In order to overcome the disadvantages of poor practicability of the existing hydrogenated titanium alloy forging process, the present invention provides a method for optimizing the parameters of the hydrogenated TC4 titanium alloy forging process
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Embodiment 1
[0025] Embodiment 1. Optimization of forging process parameters of TC4 titanium alloy with hydrogen content of 0.4 wt%.
[0026] (1) The supply state TC4 titanium alloy rod with a diameter of 18mm is machined to obtain a thermal simulation compression sample with a diameter of 8mm and a height of 12mm, and the TC4 titanium alloy sample is cleaned with absolute ethanol;
[0027] (2) Will The TC4 titanium alloy sample was placed in a hydrogen furnace, and the vacuum was evacuated to 1×10 -3 Pa, heat up to 750°C at a speed of about 5-15°C / min, hold for 8 minutes, fill the flow rate of hydrogen at 1L / min, hold for 2hrs, cool to room temperature at a speed of 5-10°C / min, and obtain hydrogen TC4 titanium alloy sample;
[0028] (3) Coat the FR5 glass lubricant on the surface of the hydrogenated TC4 titanium alloy thermal simulation compression sample, select natural hydrogen (supply state), hydrogen content 0.4wt%, deformation temperature 760°C, 800°C, 840°C, 880°C ℃, 920℃, strai...
Embodiment 2
[0042] Example 2: Optimization of forging process parameters of TC4 titanium alloy with 0.4 wt% hydrogen content.
[0043] The difference from step (6) in Example 1 is that the TC4 titanium alloy blade blank of the same size is placed in a forging die and heated to 820° C., and after 30 minutes of heat preservation, the blade is forged at a forging speed of 10 mm / min;
[0046] It can be seen from Table 2 that the room temperature tensile strength of TC4 titanium alloy forged blade with 0.4wt% hydrogen content is 1065MPa, which is 18.99% higher than the national standard (895MPa); TC4 titanium alloy forged blade with 0.4wt% hydrogen content The room temperature yield strength of the blade is 1000MPa, which is 21.21% higher than the national standard (825MPa); the 400°C tensile strength of the TC4 titanium alloy forged blade with 0.4wt% hydrogen content is 710MPa, which is 18.33% higher than the nat...
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Abstract
The invention discloses an optimization method for hydrogenated TC4 titanium alloy forging technology parameters. The optimization method is used for solving the technical problem that the practicability of a hydrogenated titanium alloy forging technology in the prior art is poor. According to the technical scheme, the optimization method comprises the steps that the flow stress and the strain data of hydrogenated TC4 titanium alloy are obtained through a thermal simulation compressive deformation experiment firstly, and then the value of the strain rate sensitivity index m, the value of the energy dissipation rate eta and the value of the flow instability parameter epsilon are calculated; and the reasonable strain rate range during hydrogenated TC4 titanium alloy forging is determined according to the criterion of the value of the energy dissipation rate eta, then, the reasonable forging temperature range during hydrogenated TC4 titanium alloy forging is determined according to the criterion of the value of the flow instability parameter epsilon, and the reasonable forging temperature and the reasonable strain rate of the hydrogenated TC4 titanium alloy are optimized out. By means of the optimization method for the hydrogenated TC4 titanium alloy forging technology parameters, a TC4 titanium alloy blade with the hydrogen content being 0.4 wt% is forged successfully; compared with the national standards of a TC4 titanium alloy forging blade, the tensile strength at room temperature, the yield strength at the room temperature and the tensile strength at the high temperature of 400 DEG C of the TC4 titanium alloy blade with the hydrogen content being 0.4 wt% are all improved.
Description
technical field [0001] The invention relates to the field of thermal processing, in particular to a method for optimizing the forging process parameters of hydrogenated TC4 titanium alloy. Background technique [0002] The comprehensive mechanical properties of titanium alloy forgings are directly determined by the microstructure of the forging, and its microstructure is determined by the forging process parameters. Therefore, on the premise of not changing the composition of titanium alloy materials, the mechanical properties of titanium alloy forgings can meet the design requirements by rationally and effectively controlling the forging process by optimizing the forging process parameters of titanium alloys. In particular, titanium alloy is a representative difficult-to-deform metal structural material. Titanium alloy forgings need to obtain excellent mechanical properties by optimizing the forging process parameters in order to meet the design requirements. [0003] Docu...
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