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Special filling materials for molybdenum alloy electron beam welding

A technology of electron beam welding and filling materials, applied in welding/cutting medium/material, welding medium, welding equipment, etc., can solve the problems of limited, intergranular fracture, grain boundary weakening, etc., to achieve low joint brittleness, oxide impurities The effect of less and high weld density

Inactive Publication Date: 2018-02-02
HARBIN INST OF TECH AT WEIHAI
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  • Application Information

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Problems solved by technology

[0003] In order to solve the above-mentioned technical problems, CN106944741 discloses the invention of a microalloying method for adding Zr to improve the strength and toughness of molybdenum and molybdenum alloy fusion welding seams. , due to the limited solid solution between Zr and Mo, adding too much Zr element will form intermetallic compounds, and at the same time cause the weakening of grain boundaries and form intergranular fracture
Although a small amount of Zr element less than 5% can purify the grain boundary and have a certain effect on improving the mechanical properties of the joint, it is still relatively limited, causing the tensile strength of the joint to reach 60% of the base metal

Method used

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  • Special filling materials for molybdenum alloy electron beam welding
  • Special filling materials for molybdenum alloy electron beam welding

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Embodiment 1

[0011] Embodiment 1: As shown in the accompanying drawings, a special filling material for electron beam welding of molybdenum alloy between titanium and nickel alloys, characterized in that the mass percentage content of each element in the molybdenum alloy is: Re: 20-50% , Zr: 1-5%, Hf: 0.5-1%, C: 0-0.01-0.1% Balance: Mo, by changing the composition of the filling material, Ti and Ni elements can be effectively isolated and the formation of Brittle intermetallic compounds, so as to achieve the purpose of high weld density, low brittleness, no pores and cracks.

[0012] The smelting process described in the present invention is as follows: Weigh the weight of the simple raw materials of each element in proportion, place them in a water-cooled copper crucible, extract the vacuum to 5×10-2Pa, fill with argon gas with a purity of 99.99%, use tungsten as the cathode, and ignite The raw materials placed in the copper crucible are heated by an electric arc. After the raw materials ...

Embodiment

[0013] Embodiment: The size of the filling layer is 100*3*0.3mm, and the composition is: 48%Re, 1.7%Zr, 0.5%Hf, and the balance Mo. Welding 3mm thick TZM molybdenum alloy, accelerating voltage 70kV, beam current 35mA, welding speed 350mm / min. After welding, there is no oxide precipitation at the grain boundary, and the tensile strength of the joint is 610MPa, which is a transgranular fracture mode.

[0014] The invention solves the substantive technical problems in the prior art due to the use of the above materials, and has the advantages of high weld density, small joint brittleness, less oxide impurities, no pores and cracks, and can avoid the formation of brittle intermetallic joints in the weld. compounds etc.

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Abstract

The invention relates to the field of dissimilar refractory material fusion welding, in particular to special filling materials for molybdenum alloy electron beam welding. The special filling materials are characterized in that molybdenum alloy comprises, by weight, 20-50% of Re, 1-5% of Zr, 0.5-1% of Hf, 0-0.01-0.1% of C, and the balance Mo. Ti and Ni are effectively isolated and formation of brittle intermetallic compounds in a welding seam is avoided by changing components of the filling materials. Due to the fact that the materials are adopted, the substantially technical problems in the prior art is solved. The special filling materials for molybdenum alloy electron beam welding has the advantages of being high in welding seam density, small in joint brittleness, little in oxide impurity, free of pores and cracks, and capable of preventing brittle intermetallic compounds against being formed in the weld joint and the like.

Description

technical field [0001] The invention relates to the field of fusion welding of dissimilar refractory materials, in particular to a special filling material for molybdenum alloy electron beam welding. Background technique [0002] With the rapid development of the aerospace industry, especially the continuous increase of the flight distance of aerospace vehicles, continuously improving the engine thrust-to-weight ratio has become an important goal in the design and manufacture of aerospace engines. In order to increase the strength and toughness of the workpiece material, molybdenum has particularly good high-temperature mechanical properties and good machinability. When the temperature is lower than 500 degrees Celsius, molybdenum has zero stability in air or water. The above advantages make molybdenum have vital applications in metallurgy, aviation, aerospace, nuclear energy, military and other fields. However, molybdenum is a hard and brittle material in nature, and its w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/24B23K35/32
CPCB23K35/24B23K35/32
Inventor 王廷李宁张峰张永赟张秉刚冯吉才
Owner HARBIN INST OF TECH AT WEIHAI
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