RE Invar alloy and its production process

A technology of Invar alloy and production process, which is applied in the field of rare earth Invar alloy and its production process, can solve the problems of brittle and hard η carbides reducing the strength of welded joints and poor weldability, and achieve no welding defects, good structure and performance, The effect of improving wettability

Inactive Publication Date: 2009-01-14
SHANGHAI UNIV OF ENG SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the deficiencies in the prior art, solve the problem that the diffusion behavior of Invar alloy / tungsten carbide interface elements easily causes poor weldability and easily forms brittle and hard η carbides to reduce the strength of welded joints, and develops a new one. Tile Alloy - Rare Earth Invar NiFeCMnNbY(Y 2 o 3 ), so that under the condition of maintaining the Invar effect, the high-concentration carbon content can inhibit the formation of large η carbides at the cemented carbide / Invar alloy weld interface

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] First according to Ni: 30%; C: 1%; Mn: 3.4%; Nb: 5%; Y 2 o 3 : 6%; Fe: balance, do the batching of each component, and then use the vacuum induction melting method to melt at 1450 ° C, cool naturally after the mold shell is poured, and finally press the ingot to form a Φ58 rod, that is, a rare earth Invar alloy.

Embodiment 2

[0014] First according to Ni: 36%; C: 0.8%; Mn: 3.4%; Nb: 3%; Y 2 o 3 : 8%; Fe: balance, do the batching of each component, and then use the vacuum induction melting method to melt at 1450 ° C, cool naturally after the mold shell is poured, and finally press the ingot to form a Φ58 rod, that is, a rare earth Invar alloy.

Embodiment 3

[0016] First according to Ni: 42%; C: 0.6%; Mn: 3.4%; Nb: 4%; Y 2 o 3 : 7%; Fe: balance, carry out the batching of each component, and then use the vacuum induction melting method to melt at 1450 ° C, cool naturally after the mold shell is poured, and finally press the ingot to form a Φ58 rod, that is, a rare earth Invar alloy.

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Abstract

The present invention is one kind of RE Inver alloy superior to available Inver alloy, which has low welded joint strength caused by element diffusion in the Inver alloy / hard alloy interface. The RE Inver alloy consists of Ni 30-42 wt%, C 0.6-1 wt%, Mn 3.4 wt%, Nb 3-5 wt%, Y2O3 6-8 wt%, and Fe for the rest. Its production process includes the following steps: 1. compounding materials in the said composition; 2. vacuum induction smelting at 1450 deg.c; 3. casting and naturally cooling; and 4. pressing ingot to form rod of 58 mm diameter.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a rare earth invar alloy and a production process thereof. Background technique [0002] Invar alloy is a functional material with special properties. It has a lower thermal expansion coefficient than any metal material in the range of room temperature to 230 ° C. It has good ductility and weldability, excellent machinability and corrosion resistance. It can be used in Production of precision instruments such as cathode ray tube shadow masks and liquefied natural gas storage tanks. The production of Invar alloy functional weldments is usually realized by connecting with certain alloy materials. WC-Co cemented carbide has excellent properties such as high wear resistance and high temperature red hardness, and is used as tool material and precision instrument. The manufacture provides a good substrate bonding material. Cemented carbide has a low coefficient of thermal expansion,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/12C22C30/00C22C33/04
Inventor 徐培全赵秀娟陈晓芬张杰
Owner SHANGHAI UNIV OF ENG SCI
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