Preparation method of low-cost titanium alloy

A titanium alloy, low-cost technology, applied in the field of low-cost titanium alloy preparation, can solve the problem of not being able to effectively reduce the cost of parts, and achieve the effects of improving density, reducing production costs, and good plasticity and fatigue properties

Active Publication Date: 2012-12-19
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as the price of rare earths increases, the cost of parts cannot be effectively reduced by adding rare earth elements

Method used

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  • Preparation method of low-cost titanium alloy
  • Preparation method of low-cost titanium alloy
  • Preparation method of low-cost titanium alloy

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Step 1. According to the nominal composition of the Ti-1.5Fe-2.5Mo alloy, titanium powder and MoFe master alloy powder are placed in a mixer according to the proportion and mixed evenly to obtain a mixed powder; the Fe in the Ti-1.5Fe-2.5Mo alloy The mass percentage content of Mo is 1.5%, the mass percentage content of Mo is 2.5%, and the balance is Ti and other unavoidable impurities; the hydrogen mass percentage content of the titanium powder prepared by hydrodehydrogenation method is not more than 0.001% The pure titanium powder has an average particle size of 45 μm and an oxygen mass content of 2800 ppm; the average particle size of the MoFe master alloy powder is 30 μm, and the oxygen mass content of the MoFe master alloy powder is 3000 ppm;

[0023] Step 2. Put the mixed powder described in step 1 into a Φ50mm×200mm cold isostatic pressing rubber sleeve, and perform cold isostatic pressing under the condition that the pressing pressure is not less than 200MPa to ob...

Embodiment 2

[0028] Step 1. According to the nominal composition of the Ti-1.5Fe-2.5Mo alloy, titanium powder and MoFe master alloy powder are placed in a mixer according to the proportion and mixed evenly to obtain a mixed powder; the Fe in the Ti-1.5Fe-2.5Mo alloy The mass percentage content of Mo is 1.5%, the mass percentage content of Mo is 2.5%, and the balance is Ti and other unavoidable impurities; the hydrogen mass percentage content of the titanium powder prepared by hydrodehydrogenation method is not more than 0.001% The pure titanium powder has an average particle size of 53 μm and an oxygen mass content of 2400 ppm; the average particle size of the MoFe master alloy powder is 60 μm, and the oxygen mass content of the MoFe master alloy powder is 2500 ppm;

[0029] Step 2. Put the mixed powder described in step 1 into a Φ50mm×200mm cold isostatic pressing rubber sleeve, and perform cold isostatic pressing under the condition that the pressing pressure is not less than 200MPa to ob...

Embodiment 3

[0034] Step 1. According to the nominal composition of the Ti-1.5Fe-2.5Mo alloy, titanium powder and MoFe master alloy powder are placed in a mixer according to the proportion and mixed evenly to obtain a mixed powder; the Fe in the Ti-1.5Fe-2.5Mo alloy The mass percentage content of Mo is 1.5%, the mass percentage content of Mo is 2.5%, and the balance is Ti and other unavoidable impurities; the hydrogen mass percentage content of the titanium powder prepared by hydrodehydrogenation method is not more than 0.001% The pure titanium powder has an average particle size of 80 μm and an oxygen mass content of 1700 ppm; the average particle size of the MoFe master alloy powder is 74 μm, and the oxygen mass content of the MoFe master alloy powder is 1000 ppm;

[0035]Step 2. Put the mixed powder described in step 1 into a Φ50mm×200mm cold isostatic pressing rubber sleeve, and perform cold isostatic pressing under the condition that the pressing pressure is not less than 200MPa to obt...

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Abstract

The invention discloses a preparation method of a low-cost titanium alloy, comprising the following steps of: 1, evenly mixing titanium powder with MoFe intermediate alloy power in proportion on the basis of the nominal composition of Ti-1.5Fe-2.5Mo alloy, so that mixed powder can be obtained; 2, forming the mixed powder in a compression way by isostatic cool pressing, so that a powder pressed shape can be obtained; and 3, sintering the powder pressed shape under the vacuum condition with the temperature from 1250DEG C to 1350DEG C, so that the Ti-1.5Fe-2.5Mo alloy can be obtained. The preparation method takes pure titanium powder with coarser granularity as a raw material, so that the oxygen content in the titanium powder can be greatly reduced, therefore, the oxygen content in the alloy can be controlled, the plasticity and the fatigue property of a Ti-1.5Fe-2.5Mo alloy part can be further improved, the relative density of the prepared alloy is more than 97%, the tensile strength of the prepared alloy is more than 850MPa, the elongation of the prepared alloy is not less than 15%, and the cross-section shrinking percentage of the prepared alloy is not less than 20%.

Description

technical field [0001] The invention belongs to the technical field of titanium alloy preparation, and in particular relates to a preparation method of low-cost titanium alloy. Background technique [0002] Titanium has a series of advantages such as light specific gravity, corrosion resistance and high specific strength, and is widely used in aerospace, shipbuilding, biomedicine, civil automobiles and other fields. However, titanium is easy to react with elements such as O, N, and H in the process of refining and processing, so the processing cost is relatively high, which limits its wide application in the civilian field. [0003] Ti-1.5Fe-2.5Mo (wt%) is a titanium alloy with promising application in automobiles, which can be used to manufacture components such as exhaust valves. But compared with steel, its cost is still high. It is a way to manufacture low-cost titanium alloy auto parts by first preparing dense prefabricated parts through the powder metallurgy process ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/04C22C14/00
Inventor 黄瑜贾文鹏刘海彦杨广宇贺卫卫赵培贾亮
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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