Forging method for equal-atomic-ratio titanium-nickel alloy large cast ingot
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A titanium-nickel alloy, equal atomic ratio technology, applied in metal processing equipment and other directions, can solve problems such as easy cracking, achieve good forging processing, good structure and performance, and eliminate the effect of cracking.
Active Publication Date: 2017-10-10
西安赛特思迈钛业有限公司
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[0005] The purpose of this invention is to provide a kind of equiatomic ratio titanium-nickel alloy large-scale ingot forging method, to solve the problem of easy cracking in the forging of titanium-nickel alloy in the prior art
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Embodiment 1
[0022] Example 1 Forging method of Φ460-800Kg ingot of TiNi50.8 (Ti-Ni50.8at%) alloy: pre-homogenization treatment, process parameters: 930-980°C, holding time 10-12h, air cooling. After removing the riser, the ingot has a weight of about 660Kg and a length of about 610mm after peeling off the skin.
[0024] First fire once: heating temperature 900-920 ℃, keep warm for 4-5h. Deformation Φ460×610→□320×990 (deformation is about 38%), the strain rate is controlled at (0.05-0.10)s -1 , Temper once in the middle.
[0025] Second fire: heating temperature 880-900 ℃, heat preservation 3-3.5h. Deformation □320×990→□200×2533 (the amount of deformation is about 60%), the strain rate is controlled at (0.10-0.25)s -1 , tempered once in the middle, divided into thirds.
[0026] Three times of fire: heating temperature 850-880 ℃, heat preservation 2-2.5h. Deformation □200×844→□110×2790 (the amount of deformation is about...
Embodiment 2
[0028] Example 2 The Φ460-960Kg ingot smelting method of TiNiV (Ti-Ni50.8-V0.5at%) alloy: pre-homogenization treatment, process parameters: 930-980 ° C, holding time 10-12h, air cooling. The riser of the ingot is cut off, the weight of the ingot is about 820Kg after peeling off the surface, and the length is about 760mm.
[0030] First fire once: heating temperature 900-920 ℃, keep warm for 4-5h. Deformation Φ460×760→□320×1232 (that is, to forge a circular billet with a cross-sectional diameter of 460mm and a length of 760mm into a square billet with a cross-sectional side length of 320mm and a length of 1232mm, the calculated deformation is about 38%), and the strain rate is controlled in (0.05-0.10)s -1 , Temper once in the middle.
[0031] Second fire: heating temperature 880-900 ℃, heat preservation 3-3.5h. Deformation □320×1232→□200×3154 (that is, forging a square billet with a side length of 320 mm and ...
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Abstract
The invention discloses a forging method for an equal-atomic-ratio titanium-nickel alloy large cast ingot. The titanium-nickel alloy large cast ingot is subjected to homogenization treatment, the technological parameter is 930-980 DEG C, and heat preservation time is 10-12 h, and air cooling is conducted; the air-cooled titanium-nickel alloy large cast ingot is subjected to the first heating number of forging, the heating temperature is 900-920 DEG C, heat preservation is conducted for 4-5 h, deformation is phi460-phi320, the strain rate is (0.05-0.10) s<1>, and a forging blank is obtained after the first heating number in a breaking mode; the forging blank is subjected to the second heating number of forging, the heating temperature is 880-900 DEG C, heat preservation is conducted for 3-3.5 h, deformation is phi320-phi200, the strain rate is (0.10-0.25) s<1>, and the forging blank is obtained after the second heating number in a breaking mode; and the forging blank is subjected to the third heating number of forging, the heating temperature is 850-880 DEG C, heat preservation is conducted for 2-2.5 h, deformation is phi200-phi110, the strain rate is (0.05-0.20) s<1>, and a titanium-nickel alloy square billet is obtained in a breaking mode. The method of the low strain rates, the multiple heating numbers and increasing deformation is adopted, forging of the titanium-nickel alloy large cast ingot is achieved, the cracking phenomenon in forging is eliminated, and the good structure and performance of materials are achieved.
Description
【Technical field】 [0001] The invention belongs to the technical field of titanium-nickel alloy processing, in particular to a large ingot forging method of an equiatomic ratio titanium-nickel alloy. 【Background technique】 [0002] Titanium-nickel-based shape memory alloy is a new type of metal functional material that emerged in the 1960s with three characteristics: shape memory, superelasticity and high damping. It also has excellent biocompatibility. It has been used in electronics, machinery , aerospace, energy, home appliances, medical care and daily necessities and other fields. [0003] Observe the binary phase diagram of TiNi alloy, the Ni% is from low to high, and there is Ti 2 Ni, TiNi, TiNi 3 Three intermetallic compounds with different properties. The analysis focuses on the TiNi phase close to the equiatomic ratio, and the high-temperature stage is the β parent phase, and its structure belongs to body-centered cubic (bcc). When the temperature drops to 1090°C...
Claims
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