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Method for refining cast titanium alloy crystalline grains

A technology for casting titanium alloys and grain refinement, which is applied in the field of titanium alloy grain refinement, can solve the problems of low material utilization rate, deterioration of mechanical properties of titanium alloy components, high production cost, etc., and achieve high material utilization rate and casting quality Controllable, low production cost effect

Active Publication Date: 2015-06-24
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] In order to overcome the disadvantages of easy introduction of inclusions in the prior art, deterioration of mechanical properties of titanium alloy components, low material utilization rate, and high production cost, the present invention proposes a titanium alloy grain refinement method

Method used

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  • Method for refining cast titanium alloy crystalline grains
  • Method for refining cast titanium alloy crystalline grains
  • Method for refining cast titanium alloy crystalline grains

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] This embodiment is a method for grain refinement of titanium alloy.

[0031] The concrete process of this embodiment is:

[0032] Step 1, raw material preparation. The raw material preparation includes the preparation of the titanium alloy test rod and the preparation of the corundum crucible.

[0033] Preparation of the titanium alloy test rod: the alloy test rod of Φ18×20mm is cut by wire cutting, and the titanium alloy is ZTC4. The obtained ZTC4 alloy test rod was ground and ultrasonically cleaned.

[0034] Preparation of corundum crucible: The surface layer material was made of yttrium oxide powder and zirconium acetate sol at a weight ratio of 3.5:1, evenly coated on the inner surface of the corundum crucible, dried naturally for 48 hours, placed in a heat treatment furnace, and sintered at 950°C for two Hour. After sintering, cool to room temperature with the furnace. Tighten the sintered corundum crucible with Mo wire to prevent the crucible from cracking du...

Embodiment 2

[0040] This embodiment is a method for grain refinement of titanium alloy.

[0041] The concrete process of this embodiment is:

[0042] Step 1, raw material preparation. The raw material preparation includes the preparation of the titanium alloy test rod and the preparation of the corundum crucible.

[0043] Preparation of the titanium alloy test rod: the alloy test rod of Φ18×20mm is cut by wire cutting, and the titanium alloy is ZTA15. The obtained ZTA15 alloy test rod was ground and ultrasonically cleaned.

[0044] Preparation of corundum crucible: Prepare the surface layer material with yttrium oxide powder and zirconium acetate sol at a weight ratio of 4.2:1, evenly coat the inner surface of the corundum crucible, dry it naturally for 48 hours, place it in a heat treatment furnace, and sinter two layers at 950°C. Hour. After sintering, cool to room temperature with the furnace. Tighten the sintered corundum crucible with Mo wire to prevent the crucible from cracking...

Embodiment 3

[0050] This embodiment is a method for grain refinement of titanium alloy.

[0051] The concrete process of this embodiment is:

[0052] Step 1, raw material preparation. The raw material preparation includes the preparation of the titanium alloy test rod and the preparation of the corundum crucible.

[0053] Preparation of the titanium alloy test rod: the alloy test rod of Φ18×20mm is cut by wire cutting, and the titanium alloy is ZTA7. The obtained ZTA7 alloy test rod was ground and ultrasonically cleaned.

[0054] Preparation of corundum crucible: Yttrium oxide powder and zirconium acetate sol were prepared as a surface layer material at a weight ratio of 4.5:1, evenly coated on the inner surface of the corundum crucible, dried naturally for 48 hours, placed in a heat treatment furnace, and sintered at 950°C for two Hour. After sintering, cool to room temperature with the furnace. Tighten the sintered corundum crucible with Mo wire to prevent the crucible from cracking...

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Abstract

The invention discloses a method for refining cast titanium alloy crystalline grains, which is used for realizing refining of a titanium alloy structure by controlling a solidification path and avoiding a performance worsening problem caused by foreign impurities. A beta phase is transformed into an alpha phase to form an alpha slice through thermal-insulation treatment of the alloy at 800 DEG C-1080 DEG C. Meanwhile, the transformed alpha slice has transformation towards the beta-phase under a thermal-insulation state. In the process, accumulation of phase transformation stress is caused, so that the alpha slice is bent and nodulized to generate an isometric crystal; consistence of casting piece temperature is controlled to achieve a purpose of refining the crystalline grains, so that structure homogeneity of a casting piece is improved. The method has the characteristics that operation is simple, production cost is low and no influences of casting piece dimension and complexity are achieved; moreover, the casting piece is controllable in quality.

Description

technical field [0001] The invention relates to the field of metal solidification manufacturing, in particular to a method for realizing titanium alloy grain refinement by controlling the solidification path process. Background technique [0002] Due to its high strength, excellent heat resistance and corrosion resistance, titanium alloys play an important role in aviation, aerospace, automobile manufacturing and other fields. However, the high cost limits the widespread use of titanium alloys. Titanium alloy investment casting is a near-net shape method, which has great cost advantages compared with other methods. During the precision casting process, because the crystal growth rate of titanium and its alloys is greater than the rate of crystal nucleus formation during the solidification process, titanium and titanium alloys tend to form coarse grain structures. In addition, titanium alloy has high melting point, strong chemical activity, and poor thermal conductivity, re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/18
Inventor 寇宏超张守银李金山王军杨光胡锐
Owner NORTHWESTERN POLYTECHNICAL UNIV
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