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Hot-working process capable of improving cogging for titanium alloy cast ingot

A titanium alloy and thermal processing technology, which is applied in the field of improving the thermal processing process of titanium alloy ingot billet opening, can solve the problems of unstable depth of shrinkage cavity at the head, large amount of shrinkage cavity removal, and large amount of grinding, etc., to achieve the elimination of end face Shrinkage cavity phenomenon, good surface quality, and improved product yield

Active Publication Date: 2014-05-07
WESTERN TITANIUM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Titanium alloys are mainly used in aviation, aerospace, ships and other fields. At present, there is no complete set of specifications or standards to guide the ingot casting of titanium alloy ingots. The main problem is that the shrinkage cavity depth of the head is unstable during the forging process. Severe cracking on the surface will result in a large amount of shrinkage cavity removal and large amount of grinding, resulting in a low yield in the blanking process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Step 1. Peel the Ф690mm TC11 ingot smelted in a vacuum consumable electric arc furnace, cut off the riser, and then remove the surface defects of the ingot by grinding;

[0021] Step 2. Place the TC11 ingot from which surface defects have been removed in step 1 in a heating furnace, preheat it at 800°C for 1.5 hours, then raise the temperature to 180°C above the β-transition point of the ingot, and keep it warm for 380 minutes;

[0022] Step 3. Place the TC11 ingot after heat preservation in step 2 on a 2500T hydraulic press with an anvil width of 350mm, and carry out billet forging at an initial forging temperature of 100°C to 150°C above the β phase transition point of the ingot, and control the final Forging temperature ≥ 850 ℃, blank forging process is:

[0023] 301. Start pressing from the middle of the ingot to the opposite direction of the jaws, control the feed rate of each pass to 300mm, and the reduction amount of each pass to 100mm. When pressing to a distanc...

Embodiment 2

[0029] Step 1. Peel the Ф790mm TC4 ingot smelted in a vacuum consumable electric arc furnace, cut off the riser, and then remove the surface defects of the ingot by grinding;

[0030] Step 2. Place the TC4 ingot from which surface defects have been removed in step 1 in a heating furnace, preheat for 2.5 hours at a temperature of 750°C, then raise the temperature to 150°C above the β-transition point of the ingot, and keep it warm for 425 minutes;

[0031] Step 3. Place the TC4 ingot after heat preservation in step 2 on a 2500T hydraulic press with an anvil width of 350mm, carry out billet forging at an initial forging temperature of 100°C to 150°C above the β phase transition point of the ingot, and control the final Forging temperature ≥ 850 ℃, blank forging process is:

[0032] 301. Start pressing from the middle of the ingot to the opposite direction of the jaws, control the feed rate of each pass to 330mm, and the reduction amount of each pass to 120mm. When pressing to a ...

Embodiment 3

[0038] Step 1. Peel the Ф690mm TC6 ingot smelted in a vacuum consumable electric arc furnace, cut off the riser, and then remove the surface defects of the ingot by grinding;

[0039] Step 2. Place the TC6 ingot from which surface defects have been removed in step 1 in a heating furnace, preheat it at a temperature of 780°C for 2 hours, then raise the temperature to 200°C above the β phase transition point of the ingot, and keep it warm for 405 minutes;

[0040] Step 3. Place the TC6 ingot after heat preservation in step 2 on a 2500T hydraulic press with an anvil width of 300mm, carry out billet forging at an initial forging temperature of 100°C to 150°C above the β phase transition point of the ingot, and control the final Forging temperature ≥ 850 ℃, blank forging process is:

[0041] 301. Press down in turn from the middle of the ingot to the opposite direction of the jaws, control the feed rate of each pass to 280mm, and the reduction amount per pass to 95mm. When the ingo...

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Abstract

The invention discloses a hot-working process capable of improving the cogging for a titanium alloy cast ingot. The process comprises the following steps of: 1, scalping the titanium alloy cast ingot and then cutting off a dead head, and then removing the surface defects of the titanium alloy cast ingot by means of grinding; 2, placing the titanium alloy cast ingot in a heating furnace to preheat, and then heating up to 150-200 DEG C above the phase transformation point of a cast ingot beta and preserving heat; 3, placing the heat-preserved titanium alloy cast ingot on a press of greater than 2000 T, and then performing cogging forging, so as to obtain a titanium alloy blank with one end which is forged to process dimensions; and step 4, placing the titanium alloy blank with one end which is forged to process dimensions in the heating furnace, heating, and forging the other end to the process dimensions in the same manner. The hot-working process disclosed by the invention is easy to realize standardized work, and reduce the instability phenomenon of head shrinkage cavity caused by human factors, thus increasing the yield of products; and with the adoption of the process method, the blanks which are less in end-surface shrinkage cavity removal amount and good in surface quality can be produced, thus increasing the yield of products.

Description

technical field [0001] The invention belongs to the technical field of metal material processing, and in particular relates to a thermal processing process for improving the billet opening of titanium alloy ingots. Background technique [0002] Titanium alloys are mainly used in aviation, aerospace, ships and other fields. At present, there is no complete set of specifications or standards to guide the ingot casting of titanium alloy ingots. The main problem is that the shrinkage cavity depth of the head is unstable during the forging process. Severe surface cracking will result in a large amount of shrinkage cavity removal and a large amount of grinding, resulting in a low yield in the blanking process. Contents of the invention [0003] The technical problem to be solved by the present invention is to aim at the deficiencies of the above-mentioned prior art, to provide a method that is easy to realize standardized operation, reduces the unstable phenomenon of head shrink...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/18C21D8/00B21J1/00
Inventor 蒲宣文宁
Owner WESTERN TITANIUM TECH
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