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Liquid state hydrogen-replacing thinning solidifying tissue method in Ti-6Al-4V alloy induction shell smelting process

A solidification structure, ti-6al-4v technology, applied in the field of liquid hydrogen placement in the induction shell melting process of titanium alloys, can solve the problems of slow hydrogen permeation speed in titanium alloy atmosphere and cannot be widely used in production, so as to improve subsequent processing performance, The effect of reducing the average grain size and improving the mechanical properties

Inactive Publication Date: 2009-03-18
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the hydrogen permeation speed of titanium alloy atmosphere is slow in solid state, only suitable for small samples or thin plate samples, and cannot be widely used in production

Method used

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  • Liquid state hydrogen-replacing thinning solidifying tissue method in Ti-6Al-4V alloy induction shell smelting process
  • Liquid state hydrogen-replacing thinning solidifying tissue method in Ti-6Al-4V alloy induction shell smelting process
  • Liquid state hydrogen-replacing thinning solidifying tissue method in Ti-6Al-4V alloy induction shell smelting process

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specific Embodiment approach 1

[0019] Specific implementation mode 1: The method for refining the solidification structure by placing hydrogen in the liquid state during the Ti-6Al-4V alloy induction shell melting process of the present embodiment is as follows:

[0020] Step 1, loading the charge of Ti-6Al-4V alloy into the crucible 4 of the induction shell melting furnace;

[0021] Step 2. Weigh TiH containing 0.09% to 0.2% of the mass of charge described in step 1. 2 preform2;

[0022] Step 3, fastening the preform 2 obtained in step 2 to the lower end of the feeding rod 1 above the crucible 4 in the induction shell melting furnace;

[0023] Step 4, close the door of the melting chamber 3 of the induction shell melting furnace, and vacuumize to 10 -1 ~10 -2 Pa, backfill high-purity argon to 300-600Pa, repeat 3 times;

[0024] Step 5. Control the pressure of high-purity argon in the melting chamber 3 to be 400-700Pa;

[0025] Step 6, switch on the power supply of the induction heating coil 6 in the i...

specific Embodiment approach 2

[0032] Embodiment 2: The difference between this embodiment and the Ti-6Al-4V alloy induction shell smelting process described in Embodiment 1 is that:

[0033] The prefabricated rod 2 described in step 2 contains 0.09% to 0.11% of TiH by mass of charge described in step 1 2 ;

[0034] In step 6, after heating until the furnace charge is completely melted, continue heating to a superheated temperature of 40°C to 80°C;

[0035] In step seven, after the preform rod 2 is completely immersed in the molten pool 5 and the feeding rod 1 is lifted, keep the temperature for 60s-90s, and then stop heating.

[0036] see image 3 , the average grain size of the macrostructure of the Ti-6Al-4V alloy material prepared by the method of this embodiment is 771 μm.

specific Embodiment approach 3

[0037] Embodiment 3: The difference between this embodiment and the method for refining the solidified structure by placing hydrogen in liquid state in the Ti-6Al-4V alloy induction shell smelting process described in Embodiment 1 is that:

[0038] The prefabricated rod 2 described in step 2 contains 0.12% to 0.14% of TiH by mass of charge described in step 1 2 ;

[0039]In step 6, after heating until the furnace charge is completely melted, continue heating to a superheated temperature of 40°C to 80°C;

[0040] In step seven, after the preform rod 2 is completely immersed in the molten pool 5 and the feeding rod 1 is lifted, keep the temperature for 60s-90s, and then stop heating.

[0041] see Figure 4 , the average grain size of the macrostructure of the Ti-6Al-4V alloy material prepared by the method of this embodiment is 612 μm.

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Abstract

A method for liquid hydrogenation refinement of solidification structure in the process of Ti-6Al-4V alloy induction skull melting relates to a liquid hydrogenation technology in the process of titanium alloy induction skull melting. The method solves the problem of slow speed of hydrogen permeation under titanium alloy atmosphere which is only applicable to the preparation of small specimen or thin specimen, but not to wide production. The detailed procedures of the method are as follows: the charging material of Ti-6Al-4V alloy is put into the crucible of an induction skull melter, heated and melted under the environment of high-purity argon and 400-700Pa pressure; pre-coated bars with the TiH2 of the weight accounting for 0.09 to 0.2 percent of the charging material are added in; when the hydrogen-contained titanium alloy in the crucible cools and the temperature drops below 300 DEG C, the charging material is vented off and cooled until the temperature equal to room temperature. The size of the Ti-6Al-4V alloy crystallization grain after the treatment of liquid hydrogenation with the method is smaller than 800 Mu m. The method is widely applicable in preparation of titanium alloys.

Description

technical field [0001] The invention relates to a technology for placing hydrogen in a liquid state in a titanium alloy induction shell smelting process and a method for refining a solidified structure of a titanium alloy. Background technique [0002] Ti-6Al-4V alloy is one of the most widely used titanium alloys, which can be cast and forged to obtain components. Titanium alloy has relatively high specific strength, good anti-corrosion, anti-oxidation, anti-fatigue ability, so it has been widely used in aviation, aerospace, navigation, chemical industry, medical and health, food and sports and other fields. The very large amount of titanium alloy used and the low processing efficiency caused by the mechanical properties of titanium alloy have become a prominent contradiction at present. [0003] The first step in the production and processing of Ti-6Al-4V alloy is that the solidification structure is relatively coarse when melting and casting titanium alloy ingots (castin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/02C22C1/03C22F1/18
Inventor 苏彦庆张月红郭景杰吴士平丁宏升傅恒志
Owner HARBIN INST OF TECH
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