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Free-cutting titanium alloy and preparation method thereof

A titanium alloy, easy-cutting technology, applied in the field of easy-cut titanium alloy and its preparation, can solve the problems of long hydrogen permeation process, increase process cost, reduce processing efficiency, etc., achieve low elastic modulus, excellent machinability, Surface smoothing effect

Inactive Publication Date: 2012-07-25
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for large-sized parts, on the one hand, the hydrogen permeation process takes a long time, and the hydrogen loss is large, which increases the process cost. On the other hand, the vacuum dehydrogenation process takes too long, which reduces the processing efficiency.

Method used

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  • Free-cutting titanium alloy and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Weigh Cu powder with a mass percentage of 5% and Ti powder with a mass percentage of 95% (the total mass percentage of impurity elements is less than 0.1%), mix until the composition is uniform, and press under a pressure of 700MPa to form a Ф10×5mm 2 The billet was sintered at 1000°C for 2h with a vacuum of 2×10 -2 Pa, cooling with the furnace to get Ti-5Cu alloy. Its phase composition is α-Ti and Ti 2 Cu, the microstructure is α lamellar sheets and Ti distributed in between 2 Cu. The compressive yield strength of the alloy is 850MPa, which is higher than that of the pure Ti sample sintered under the same conditions (700MPa). The alloy is drilled and cut and corrected with a correcting die, the drilling is easy, the hole wall is bright, and the positioning accuracy of the hole is high.

Embodiment 2

[0021] Weigh Cu powder with a mass percentage of 15% and Ti powder with a mass percentage of 85% (the total mass percentage of impurity elements is less than 0.1%), mix until the composition is uniform, and press it into a Ф10×5mm under a pressure of 900MPa 2 The billet was sintered at 850°C for 1h with a vacuum of 2×10 -2 Pa, cooling with the furnace to get Ti-15Cu alloy. Its phase composition is α-Ti and Ti 2 Cu, the microstructure is a typical two-phase eutectoid structure. The compressive yield strength of the alloy is 750MPa, which is higher than that of the pure Ti sample sintered under the same conditions (700MPa). The alloy is drilled and cut and corrected with a correcting die, the drilling is easy, the hole wall is bright, and the positioning accuracy of the hole is high.

Embodiment 3

[0023] Weigh 5% Cu powder, 10% Cr powder and 85% Ti powder (the total mass percentage of impurity elements is less than 0.1%), mix until the composition is uniform, and press under 700MPa pressure to form Ф10×5mm 2 The billet was sintered at 900°C for 2h with a vacuum of 2×10 -2 Pa, cooling with the furnace to get Ti-10Cr-5Cu alloy. Its phase composition is α-Ti, Ti 4 Cr and Ti 2 Cu, the microstructure is composed of basket structure and a small amount of equiaxed grains. The compressive yield strength of the alloy is 700MPa, which is higher than that of the pure Ti sample sintered under the same conditions (450MPa). In addition, the elastic modulus of the alloy is 77 GPa, which is lower than that of pure Ti (95 GPa) under the same conditions. The alloy is drilled and cut and corrected with a correcting mold. The drilling is easy, the hole wall is bright, there are normal tearing bands, the cutting performance is good, and the positioning accuracy of the hole is high.

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Abstract

The invention belongs to the field of metal materials, and relates to a free-cutting titanium alloy with excellent cutting performance acquired by an alloying method and a preparation method of the alloy. The free-cutting titanium alloy comprises the following components in percentage by mass: 3-15% of Cu, or 3-15% of Cu and 5-15% of Cr, below 0.1% of other impurity elements in total and the balance of a titanium-based alloy. The preparation method is characterized in that the method comprises the steps of uniformly mixing powder raw materials of Ti, Cu and Cr in proportion, compacting, and sintering in a vacuum, wherein the sintering temperature is 800-1100 DEG C, the sintering time is 1-3 hours, and the vacuum degree is less than or equal to 10<-1>Pa. The free-cutting titanium alloy provided by the invention has combination property of high strength, low elastic modulus, and excellent machinability, is very suitable for medical implant materials, automobile parts, and light industrial products for civil use such as titanium watches, titanium ornaments and the like.

Description

[0001] technical field [0002] The invention belongs to the field of metal materials, and relates to a free-cutting titanium alloy and a preparation method thereof. The free-cutting titanium alloy described in the present invention improves its cutting performance through alloying, and provides a titanium alloy with high strength, low elastic modulus, and excellent cutting performance at the same time, which is very suitable for medical implant materials, Auto parts and civilian light industrial products such as titanium watches, titanium ornaments, etc. [0003] Background technique [0004] Titanium is a new type of metal, which has the advantages of low density, high strength, good corrosion resistance and high specific strength. It has a wide range of applications in aerospace, shipbuilding, seawater power generation, chemical metallurgy, automobile and biomedicine. At present, countries all over the world have invested a lot of manpower and material resources in the ...

Claims

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Application Information

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IPC IPC(8): C22C14/00C22C1/04
Inventor 宋西平赵超陈宁
Owner UNIV OF SCI & TECH BEIJING