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A method for improving the strength and plasticity of tzm bars

A bar and strength technology, which is applied in the field of improving the strength and plasticity of TZM bars, can solve the problems that the mechanical properties of TZM alloys are not enough to meet the needs of rotor copper sleeves, and achieve the effects of increased yield strength, improved plasticity, and improved processing effects

Active Publication Date: 2021-02-05
SHAANXI SIRUI ADVANCED MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in actual production and use, the mechanical properties of the TZM alloy prepared by the traditional powder metallurgy process are still not enough to meet the preparation of the shaft of the rotor copper sleeve, such as density, strength, plasticity, etc. Therefore, in order to improve the strength and plasticity of the TZM alloy , a new preparation method of TZM alloy is needed to enhance its mechanical properties

Method used

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  • A method for improving the strength and plasticity of tzm bars
  • A method for improving the strength and plasticity of tzm bars
  • A method for improving the strength and plasticity of tzm bars

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A method for improving TZM rod strength and plasticity, comprising the steps of:

[0034] S1 Molybdenum-titanium-zirconium alloy powder preparation: molybdenum-titanium-zirconium alloy powder is mixed with molybdenum powder, titanium hydride powder, zirconia powder, carbon powder, and hafnium hydride powder to obtain molybdenum-titanium-zirconium alloy powder. The mass fraction is 0.50% titanium, 0.08% zirconium, 0.02% carbon, 0.30% hafnium, and the rest is molybdenum; by adding 0.30% hafnium, the strength of the TZM alloy can be strengthened by forming a two-way structure;

[0035] S2 Compression molding: put the molybdenum-titanium-zirconium alloy powder into the mold for hot isostatic pressing treatment to obtain a shaped bar; wherein, the hot isostatic pressing in the step S2 is specifically: the treatment temperature is 980°C, the pressure is 185MPa, and the heat preservation Pressure time 1h;

[0036] S3 sintering treatment: sintering the formed bar in a vacuum s...

Embodiment 2

[0041] S1 Molybdenum-titanium-zirconium alloy powder preparation: molybdenum-titanium-zirconium alloy powder is mixed with molybdenum powder, titanium hydride powder, zirconia powder, carbon powder, and hafnium hydride powder to obtain molybdenum-titanium-zirconium alloy powder. The mass fraction is 0.50% titanium, 0.08% zirconium, 0.02% carbon, 0.45% hafnium, and the rest is molybdenum; by adding 0.45% hafnium, the strength of the TZM alloy can be strengthened by forming a two-way structure;

[0042] S2 Compression molding: put the molybdenum-titanium-zirconium alloy powder into the mold for hot isostatic pressing to obtain a shaped bar; wherein, the hot isostatic pressing in the step S2 is specifically: the treatment temperature is 1350°C, the pressure is 260MPa, and the heat preservation Pressure time 1.4h;

[0043] S3 sintering treatment: sintering the formed bar in a vacuum sintering furnace through gradient heating to obtain a billet; wherein, the gradient heating is spe...

Embodiment 3

[0048] A method for improving TZM rod strength and plasticity, comprising the steps of:

[0049] S1 Molybdenum-titanium-zirconium alloy powder preparation: molybdenum-titanium-zirconium alloy powder is mixed with molybdenum powder, titanium hydride powder, zirconia powder, carbon powder, and hafnium hydride powder to obtain molybdenum-titanium-zirconium alloy powder. The mass fraction is 0.50% titanium, 0.08% zirconium, 0.02% carbon, 0.65% hafnium, and the rest is molybdenum; by adding 0.65% hafnium, the strength of the TZM alloy can be strengthened by forming a two-way structure;

[0050] S2 Compression molding: put the molybdenum-titanium-zirconium alloy powder into the mold for hot isostatic pressing to obtain a shaped bar; wherein, the hot isostatic pressing in the step S2 is specifically: processing temperature 1550°C, pressure 280MPa, heat preservation Pressure time 2h;

[0051] S3 sintering treatment: sintering the formed bar in a vacuum sintering furnace through gradi...

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Abstract

The invention discloses a method for improving the strength and plasticity of TZM rods, comprising the following steps: S1 Preparation of molybdenum-titanium-zirconium alloy powder: mixing molybdenum powder, titanium hydride powder, zirconia powder, carbon powder, and hafnium hydride powder to obtain molybdenum-titanium Zirconium alloy powder; S2 compression molding: putting molybdenum-titanium-zirconium alloy powder into the mold for hot isostatic pressing to obtain a shaped bar; S3 sintering treatment: sintering the shaped bar in a vacuum sintering furnace through gradient heating, Obtain the billet; S4 hot forging: use multi-directional forging to hot forge the billet to the required bar size; S5 heat treatment: perform heat treatment on the hot forged bar, and use machining equipment to process the bar into the required size according to the drawing axis. In the present invention, the TZM alloy has a completely recrystallized structure and submicron ultrafine equiaxed grains by adding hafnium and multi-directional forging, so that the tensile strength and yield strength are significantly improved, and the strength and plasticity of the TZM rod are improved. .

Description

technical field [0001] The invention relates to the technical field of alloy metal preparation, in particular to a method for improving the strength and plasticity of TZM rods. Background technique [0002] TZM alloy, that is, molybdenum-zirconium-titanium alloy, has the characteristics of high melting point, high strength, high elastic modulus, small linear expansion coefficient, low vapor pressure, good electrical and thermal conductivity, strong corrosion resistance and good high-temperature mechanical properties, so it is widely used in many industries. It has been widely used in the field; TZM alloy has been widely used in medical X-ray tubes, and because of its excellent mechanical properties, it is used to prepare the shaft of the rotor copper sleeve. [0003] TZM alloy is often prepared by powder metallurgy, which has unique chemical composition, mechanical and physical properties, and these properties cannot be obtained by traditional melting and casting methods. It...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C27/04B22F3/15B22F3/10B22F3/17B22F3/24C22F1/18C22F1/02
CPCB22F3/101B22F3/15B22F3/17B22F3/24B22F2003/248B22F2999/00C22C27/04C22F1/002C22F1/02C22F1/18B22F2201/20B22F2201/013
Inventor 杨平陈梅侯蕊王小明
Owner SHAANXI SIRUI ADVANCED MATERIALS CO LTD