A kind of processing method of high temperature resistant titanium alloy casting

A processing method and titanium alloy technology, applied in the preparation/treatment of rare earth metal compounds, rare earth metal oxides/hydroxides, yttrium oxide/yttrium hydroxide, etc., can solve the problem of poor fluidity of titanium alloy materials and decline in mechanical properties of products , Insufficient compactness and other problems, to achieve the effect of good casting surface quality, improved mechanical properties, improved use safety and work efficiency

Active Publication Date: 2020-10-30
安徽省含山县兴建铸造厂
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method ignores the properties and characteristics of the titanium alloy itself. Due to the poor fluidity and poor filling performance of the titanium alloy material, especially when preparing castings with complex shapes, the conventional casting method will cause insufficient compactness, shrinkage and shrinkage. Loose, coarse grains, and poor air tightness lead to the decline of mechanical properties and heat dissipation of the product, which affect the use effect and service life.

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  • A kind of processing method of high temperature resistant titanium alloy casting

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Embodiment 1

[0019] A processing method for a high temperature resistant titanium alloy casting, comprising the following steps:

[0020] (1) Clean and dry the titanium alloy ingot and place it in a graphite crucible resistance furnace for smelting. After the ingot is completely melted, add nano-yttrium oxide powder with a mass fraction of 0.037% of the ingot mass, and refine after slight stirring , stand still for 4 minutes after deoxygenation and degassing, and remove slag;

[0021] (2) After cooling the alloy liquid after slag removal for 8 seconds, squeeze it into the cavity of the device mold after preheating and exhausting at 310°C. Under the operation of the squeeze casting equipment, pressurize the mold and apply a pressure of 1800KN. The holding time is 34 seconds, and the initial extrusion speed is 0.04 m / s. After maintaining for 10 seconds, keep moving at a speed of 0.12 m / s. After the alloy liquid is completely solidified, open the mold and pick up the parts.

[0022] As a fur...

Embodiment 2

[0030] A processing method for a high temperature resistant titanium alloy casting, comprising the following steps:

[0031] (1) Clean and dry the titanium alloy ingot and place it in a graphite crucible resistance furnace for smelting. After the ingot is completely melted, add nano-yttrium oxide powder with a mass fraction of 0.038% of the ingot mass, and refine after slight stirring , stand still for 5 minutes after deoxygenation and degassing, and remove slag;

[0032] (2) After cooling the alloy liquid after slag removal for 9 seconds, squeeze it into the cavity of the device mold after preheating and exhausting at 320°C. Under the extrusion casting equipment, pressurize the mold and apply a pressure of 1820KN. The holding time is 36 seconds, and the initial extrusion speed is 0.045 m / s. After maintaining for 11 seconds, keep moving at a speed of 0.13 m / s. After the alloy liquid is completely solidified, the mold can be opened and the parts can be taken.

[0033] As a fur...

Embodiment 3

[0041] A processing method for a high temperature resistant titanium alloy casting, comprising the following steps:

[0042] (1) Clean and dry the titanium alloy ingot and place it in a graphite crucible resistance furnace for smelting. After the ingot is completely melted, add nano-yttrium oxide powder with a mass fraction of 0.040% of the ingot mass, and refine after slight stirring , stand still for 6 minutes after deoxygenation and degassing, and carry out slag removal;

[0043] (2) After cooling the alloy liquid after slag removal for 10 seconds, squeeze it into the cavity of the device mold after preheating and exhausting at 330°C. Under the operation of the extrusion casting equipment, pressurize the mold and apply a pressure of 1840KN. The holding time is 38 seconds, and the initial extrusion speed is 0.05 m / s. After maintaining for 12 seconds, keep moving at a speed of 0.14 m / s. After the alloy liquid is completely solidified, the mold can be opened and the parts can ...

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Abstract

The invention relates to the technical field of new material processing and discloses a processing method for a high-temperature resistant titanium alloy casting. According to the processing method for the high-temperature resistant titanium alloy casting, by means of study on titanium alloy characteristics and casting characteristics, a prepared nano yttrium oxide material is fused in titanium alloy adopting a melting addition way utilizing an extrusion casting method, the alpha+beta phase tissue composition of the titanium alloy is optimized, unsteady tissue is reduced in proportion and is transformed into fine and uniform lamellar tissue, the processing method has high utilization rate of titanium alloy liquid, the heat treatment strengthening step is omitted, the prepared titanium alloy casting can exert excellent high-temperature resistance and has good heat dissipation effect, meanwhile, mechanical properties are improved significantly, by means of the processing method for the high-temperature resistant titanium alloy casting, the characteristics of the poor fluidity and the general filling capacity of the titanium alloy can be overcome quite well, crystal particles can be refined, the macroscopic structure shrinkage cavity and microscopic structure shrinkage porosity phenomena can be eliminated, processed parts of complex shapes and structures can be fabricated, and thecasting surface quality is good, so that the service life of the titanium alloy casting is prolonged.

Description

technical field [0001] The invention belongs to the technical field of new material processing, and in particular relates to a processing method of a high-temperature-resistant titanium alloy casting. Background technique [0002] Titanium is an important structural metal developed in the 1950s. Titanium alloys are widely used in various fields because of their high strength, good corrosion resistance, and high heat resistance. Many countries in the world have recognized the importance of titanium alloy materials, researched and developed them one after another, and obtained practical applications. Titanium alloy is an alloy composed of titanium element and other elements. Titanium has two kinds of allotropic crystals: titanium is an allotrope with a melting point of 1668°C, and it is a close-packed hexagonal lattice structure when it is lower than 882°C, called α-titanium; it is a body-centered cubic structure above 882°C lattice structure, called β-titanium. Utilizing t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D18/02C22C14/00C22C32/00C22C30/00C01F17/218C01F17/10B82Y40/00
CPCB22D18/02B82Y40/00C01P2004/64C22C14/00C22C30/00C22C32/0031
Inventor 李传
Owner 安徽省含山县兴建铸造厂
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