Eureka AIR delivers breakthrough ideas for toughest innovation challenges, trusted by R&D personnel around the world.

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

A technology of solidification structure and ti-6al-4v, which is applied to the field of liquid hydrogen in the process of induction smelting of titanium alloys, can solve the problems of not being widely used in production, slow hydrogen permeation rate of titanium alloy atmosphere, etc., to improve the subsequent processing performance, The effect of grain size reduction and mechanical properties improvement

Inactive Publication Date: 2008-02-13
HARBIN INST OF TECH
View PDF0 Cites 7 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • 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

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0017] 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:

[0018] Step 1, loading the charge of Ti-6Al-4V alloy into the crucible 4 of the induction shell melting furnace;

[0019] Step 2. Weigh TiH containing 0.09% to 0.2% of the mass of charge described in step 1. 2 preform2;

[0020] 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;

[0021] 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;

[0022] Step 5: Control the pressure of the high-purity argon gas in the melting chamber 3 at 400-700 Pa.

[0023] Step 6, switch on the power supply of the induction heating coil 6 in...

specific Embodiment approach 2

[0030] Specific embodiment 2: The difference between this embodiment and the Ti-6Al-4V alloy induction shell smelting process described in specific embodiment 1 is that:

[0031] 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 ;

[0032] In step 6, after heating until the furnace charge is completely melted, continue heating to a superheated temperature of 40°C to 80°C;

[0033] 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.

[0034] Referring to FIG. 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

[0035] Embodiment 3: The difference between this embodiment and the method for refining the solidified structure by adding liquid hydrogen in the Ti-6Al-4V alloy induction shell smelting process described in Embodiment 1 is that:

[0036] 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 ;

[0037] In step 6, after heating until the furnace charge is completely melted, continue heating to a superheated temperature of 40°C to 80°C;

[0038] 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.

[0039] Referring to FIG. 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.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
diameteraaaaaaaaaa
particle sizeaaaaaaaaaa
particle sizeaaaaaaaaaa
Login to View More

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com