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Method for preparing nickel-chromium multi-component high-resistance electrothermal alloy

An electrothermal alloy and high-resistance technology is applied in the field of preparation of nickel-chromium-based multi-element high-resistance electrothermal alloys, which can solve the problems of affecting the service life of products, large size of precipitates, irregular shapes, etc., and achieve improved service life and high mechanical properties. , the effect of improving the appearance

Active Publication Date: 2014-07-30
YANCHENG XINYANG ELECTROTHERMAL MATERIAL CO LTD
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Problems solved by technology

As we all know, the service temperature range of nickel-chromium series electric heating alloy is a uniform austenite structure, and no phase transformation occurs from room temperature to high temperature. However, during the hot rolling process of the alloy, many different types of precipitation will appear in the matrix of the alloy. The above-mentioned precipitates are large in size, irregular in shape, and highly brittle, severely splitting the matrix and affecting the service life of the product

Method used

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Embodiment Construction

[0008] The following examples further illustrate and understand the present invention.

[0009] The finished alloy products of the embodiments were prepared according to the following methods: (1) Batching: batching according to the following composition: C: 0.0035%, Si: 1.8%, Mn: 0.2%, Al: 0.75%, Cr: 21%, Co: 1.1% , Hf: 2.9%, Zr: 5%, V: 3.7%, Mo: 2.1%, Ti: 1.5%, Tb: 0.1%, Dy: 0.09%, B: 0.014%, S≤0.0001%, P≤0.0001% , The balance is nickel and unavoidable impurities; (2) Melting: Put the above raw materials into a non-consumable electromagnetic induction melting furnace, and vacuum to 1×10 -3 Pa, filled with high purity argon to 1×10 4 Pa, smelted at a temperature above 2900℃ and then cooled into alloy ingots with the furnace; (3) Crushing and ball milling: pulverize the smelted alloy ingots and grind them in a high-energy ball mill for 45 hours to obtain an average particle size of 1~5μm Alloy powder; (4) Spark plasma sintering: Put the mold filled with the above alloy powder int...

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Abstract

The invention relates to a method for preparing a nickel-chromium multi-component high-resistance electrothermal alloy and particularly relates to a method for preparing the nickel-chromium multi-component high-resistance electrothermal alloy by melting in combination with powder metallurgy. The preparation method comprises the following steps of proportioning raw materials, melting, crushing, ball-milling, carrying out spark plasma sintering, carrying out homogenizing annealing and isothermal forging, hot-rolling steel wire rods, carrying out stress relief annealing, rinsing and carrying out multi-pass drawing and the like. Due to the adoption of the preparation method combining melting and powder metallurgy, the composition segregation caused by the large difference in the melting point, density and mass ratio of each component in a conventional smelting method can be effectively avoided, uniform distribution of each component is achieved, the microstructures of the alloy are effectively improved in combination with subsequent homogenizing annealing, isothermal forging, hot rolling of steel wire rods and the like and the mechanical properties, application temperature and service life are improved.

Description

Technical field: [0001] The invention relates to a preparation method of a nickel-chromium series multi-element high-resistance electric heating alloy, in particular to a preparation method combining the melting and powder metallurgy of the nickel-chromium series multi-element high-resistance electric heating alloy. Background technique: [0002] Electric heating alloy materials are resistance alloys that make use of the resistance characteristics of materials to produce heating elements. At present, the electric heating alloy material has become an important engineering alloy material, which is suitable for machinery, metallurgy, electronics, chemical industry and other industries, and occupies an important position in the national economy. Nickel-chromium electric heating alloy has the advantages of uniform and stable resistivity, high oxidation resistance, high melting point, good high temperature strength, hot workability, etc. It has been widely used in electrical appliances...

Claims

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Application Information

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IPC IPC(8): C22C19/05C22C1/10B23P15/00
Inventor 郭健郭小芳郭乃林
Owner YANCHENG XINYANG ELECTROTHERMAL MATERIAL CO LTD
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