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An ultra-low interstitial phase high-toughness cast titanium alloy and its melting and casting method

A technology for casting titanium alloys and interstitial phases, applied in the field of metal materials and casting, can solve the problems of overall equipment safety, hidden danger of reliability accidents, damage to the plasticity and toughness of castings, etc., and achieves good consistency, stable performance and high elongation. Effect

Active Publication Date: 2017-01-04
SHENYANG RES INST OF FOUNDRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high content of interstitial elements such as C, N, H, and O in conventional cast titanium alloys, although the mechanical strength is improved, the plasticity and toughness of the casting are damaged. Safety and reliability cause great potential accidents

Method used

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  • An ultra-low interstitial phase high-toughness cast titanium alloy and its melting and casting method
  • An ultra-low interstitial phase high-toughness cast titanium alloy and its melting and casting method
  • An ultra-low interstitial phase high-toughness cast titanium alloy and its melting and casting method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Embodiment 1, produce a kind of size about 500mm×250mm titanium alloy impeller casting, the steps are as follows:

[0017] (1) Preparation of master alloy electrode raw materials: the composition of titanium alloy electrodes is shown in Table 1;

[0018] Table 1 Composition of titanium alloy electrodes wt.%

[0019] element Ti Al sn C N H O Fe Si content margin 5.1 2.7 0.015 0.024 0.006 0.027 0.035 0.01

[0020] (2) Graphite mold preparation: According to the casting process diagram, the graphite electrode block is processed into graphite mold by mechanical processing and manual grinding;

[0021] (3) Graphite mold preheating: put the graphite mold into a vacuum high-temperature degassing furnace for degassing treatment, and the vacuum degree is 1×10 -2 Pa, the temperature is controlled at 900 ° C, and the temperature is kept for 4 hours. After cooling, transfer it to a vacuum container for use;

[0022] (4) Alloy smelting:...

Embodiment 2

[0029] Embodiment 2, produce a kind of size about 800mm×150mm titanium alloy shell casting, the steps are as follows:

[0030] (1) Preparation of master alloy electrode raw materials: the composition of titanium alloy electrodes is shown in Table 4;

[0031] Table 4 Composition of titanium alloy electrodes wt.%

[0032] element Ti Al sn C N H O Fe Si content margin 4.9 2.45 0.01 0.018 0.005 0.03 0.03 0.02

[0033] (2) Graphite mold preparation: According to the casting process diagram, the graphite electrode block is processed into graphite mold by mechanical processing and manual grinding;

[0034] (3) Graphite mold preheating: put the graphite mold into a vacuum high-temperature degassing furnace for degassing treatment, the vacuum degree is 1.5×10 -2 Pa, the temperature is controlled at 1000 °C, and the temperature is kept for 4 hours. After cooling, transfer it to a vacuum container for use;

[0035] (4) Alloy smelting: instal...

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Abstract

The invention discloses a cast titanium alloy with ultralow interstitial phase and high tenacity. The cast titanium alloy is characterized by comprising the following alloy constituents in percentage by weight: 4.5-5.5% of aluminum, 2-3% of tin, less than or equal to 0.03% of carbon, less than or equal to 0.03% of nitrogen, less than or equal to 0.010% of hydrogen, less than or equal to 0.05%of oxygen, less than or equal to 0.3% of iron, less than or equal to 0.15% of silicon, and the balance of titanium. The cast titanium alloy disclosed by the invention is high in purity, good in consistency, stable in performance, and excellent in tensile strength and ductility.

Description

technical field [0001] The invention relates to metal materials and casting technology, in particular to a titanium alloy for casting and its melting and casting technology. Background technique [0002] Cast titanium alloy has high specific strength and corrosion resistance, and has become an important structural material in the field of equipment manufacturing. In recent years, the development of high-end equipment manufacturing technologies such as aviation, aerospace, and ships has put forward higher requirements on the performance of titanium alloy parts. It not only requires titanium alloy castings to have higher strength, but also needs to have better toughness. Due to the high content of interstitial elements such as C, N, H, and O in conventional cast titanium alloys, although the mechanical strength is improved, the plasticity and toughness of the casting are damaged. Safety and reliability cause great potential accidents. Therefore, the invention of high-toughne...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C14/00B22D21/00
Inventor 娄延春赵军刘鸿羽闫平游涛史昆刘时兵杨海涛宁兆生
Owner SHENYANG RES INST OF FOUNDRY