阅读说明：本技术 一种高电阻率、高延伸率的合金材料及其制备方法 (Alloy material with high resistivity and high elongation and preparation method thereof ) 是由 姚海华 王鲁 王本鹏 薛云飞 周正 于 2020-05-28 设计创作，主要内容包括：本发明涉及一种高电阻率、高延伸率的合金材料及其制备方法,属于合金材料领域。以所述合金材料的总质量为100％计,所述合金材料的化学成分质量百分比为：铁：17-25％,钴：14-25％,铬：10-19％,铝：0.5-6％,非金属元素：0.2-2％,余量为镍和不可避免的杂质；其中,所述非金属元素为硼、碳和硅中的一种以上。原料经熔炼、重熔和浇铸后得到一种高电阻率、高延伸率的合金材料。通过调控各元素的含量,获得单一相结构的同时,提高了合金材料电阻率并改善了其机械性能,有助于实现不同需求的加工变形,具有广阔的应用前景。(The invention relates to an alloy material with high resistivity and high elongation and a preparation method thereof, belonging to the field of alloy materials. The alloy material comprises the following chemical components in percentage by mass based on the total mass of the alloy material as 100 percent: iron: 17-25%, cobalt: 14-25%, chromium: 10-19%, aluminum: 0.5-6%, non-metallic elements: 0.2-2%, the balance being nickel and unavoidable impurities; wherein the non-metal element is more than one of boron, carbon and silicon. The raw materials are smelted, remelted and cast to obtain the alloy material with high resistivity and high elongation. By regulating the content of each element, the single-phase structure is obtained, the resistivity of the alloy material is improved, the mechanical property of the alloy material is improved, the processing deformation of different requirements is facilitated, and the method has a wide application prospect.)

1. A high-resistivity and high-elongation alloy material is characterized in that: the alloy material comprises the following chemical components in percentage by mass based on the total mass of the alloy material as 100 percent: iron: 17-25%, cobalt: 14-25%, chromium: 10-19%, aluminum: 0.5-6%, non-metallic elements: 0.2-2%, the balance being nickel and unavoidable impurities; wherein the non-metal element is more than one of boron, carbon and silicon.

2. The high resistivity, high elongation alloy material of claim 1, wherein: the mass percent of the aluminum is 2-4%.

3. The high resistivity, high elongation alloy material of claim 1, wherein: the mass percentage of the nonmetal elements is 0.4-1.3%.

4. A method for preparing a high resistivity, high elongation alloy material according to any one of claims 1 to 3, characterized by: the method comprises the following steps:

(1) smelting: weighing raw materials according to chemical components of the high-resistivity alloy material, and preparing a master alloy ingot by a vacuum induction melting method under the protection of argon;

(2) remelting and casting: under the protection of argon, heating the master alloy ingot to 1400-1600 ℃ for remelting, and preparing a high-resistivity alloy material by a turnover casting method; wherein, the current is 500-600A during the turnover casting;

wherein the vacuum degree in the smelting, remelting and casting processes is less than or equal to 2.5 × 10^-3Pa。

5. The method of claim 4, wherein the alloy material has a high resistivity and a high elongation, and the method comprises the steps of: when the alloy material contains a non-metallic element boron, ferroboron with the boron content of more than or equal to 18 wt.% is adopted as a raw material of the chemical component boron, and the purity of the raw materials of the other chemical components is more than or equal to 99.5 wt.%; when the alloy material does not contain boron which is a non-metallic element, the raw material purity of the chemical components is more than or equal to 99.5 wt.%.

Technical Field

The invention relates to an alloy material with high resistivity and high elongation and a preparation method thereof, belonging to the field of alloy materials.

Background

Electrothermal alloys are a class of materials that utilize the resistance characteristics of the material to produce the joule effect to convert electrical energy into thermal energy, such as typical nichrome resistance wire. However, with the development of industry, people have higher and higher requirements on the performance of various electric heating elements. Including the need for higher electrical resistivity of the alloy to achieve high heat transfer efficiency, and better processability to meet the demands of different service environments on material shape while maintaining lower cost, which is increasingly difficult to meet with existing nickel chromium alloys.

Disclosure of Invention

In view of the problems of the prior art, the invention aims to provide an alloy material with high resistivity and high elongation and a preparation method thereof. By regulating the content of each element, the single-phase structure is obtained, the resistivity of the alloy is improved, the mechanical property of the alloy is improved, the processing deformation of different requirements is facilitated, and the method has a wide application prospect.

The purpose of the invention is realized by the following technical scheme:

the high-resistivity and high-elongation alloy material comprises the following chemical components in percentage by mass based on 100% of the total mass of the alloy material: iron: 17-25%, cobalt: 14-25%, chromium: 10-19%, aluminum: 0.5-6%, non-metallic elements: 0.2-2%, the balance being nickel and unavoidable impurities; wherein the non-metal element is more than one of boron, carbon and silicon.

Preferably, the aluminum accounts for 2-4% by mass.

Preferably, the mass percentage of the non-metal elements is 0.4-1.3%.

The invention relates to a preparation method of an alloy material with high resistivity and high elongation, which comprises the following steps:

(1) smelting: weighing raw materials according to chemical components of the high-resistivity alloy material, and preparing a master alloy ingot by a vacuum induction melting method under the protection of argon;

(2) remelting and casting: under the protection of argon, heating the master alloy ingot to 1400-1600 ℃ for remelting, and preparing a high-resistivity alloy material by a turnover casting method; wherein, the current is 500-600A during the turnover casting;

wherein the vacuum degree in the smelting, remelting and casting processes is less than or equal to 2.5 × 10^-3Pa。

Preferably, when the alloy material contains a non-metallic element boron, ferroboron with the boron content of more than or equal to 18 wt.% is adopted as a raw material of the chemical component boron, and the purity of the raw materials of the other chemical components is more than or equal to 99.5 wt.%; when the alloy material does not contain boron which is a non-metallic element, the raw material purity of the chemical components is more than or equal to 99.5 wt.%.

Advantageous effects

The alloy phase structure of the high-resistivity alloy material is a single-phase solid solution, and the high-resistivity alloy material has high resistivity and good mechanical property and is easy to process. The improvement of the alloy performance benefits from the reasonable matching of the design of the components and the elements. The alloy material is a multi-principal-element alloy containing nickel, iron, cobalt and chromium, wherein the design of several transition metals can realize better mutual solubility by considering that the atomic radii of the transition metals are closer to each other so as to obtain a single-phase solid solution structure and provide guarantee for better plastic deformation capability of the alloy; the introduction of a proper amount of aluminum element into the alloy system can increase the lattice distortion of the alloy, improve the overall resistivity of the alloy and simultaneously be beneficial to improving the high-temperature oxidation resistance of the alloy under the combined action of the aluminum element and the chromium element; in addition, the addition of a proper amount of non-metallic elements can provide more nucleation particles for the liquid alloy, inhibit the growth of alloy grains, improve the processing performance and simultaneously improve the resistivity of the alloy.

Compared with the conventional nickel-chromium alloy, the alloy material of the invention comprises the following components: (1) the resistivity is remarkably improved, and can reach more than 130 mu omega cm under an as-cast condition, which is higher than that of the traditional nickel-chromium alloy (about 100-115 mu omega cm). (2) The mechanical property is obviously improved, especially the elongation is improved, the tensile strength is kept above 600MPa under the alloy casting condition, and the elongation is over 30 percent. (3) The excellent plastic deformation capability is beneficial to realizing subsequent processing such as drawing and rolling.

Drawings

Fig. 1 is an X-ray diffraction (XRD) pattern of examples 5 and 7 and comparative examples 1 and 2.

Fig. 2 is a static tensile stress-strain graph for examples 5 and 7 and comparative examples 1 and 2.

Detailed Description

The invention is further illustrated by the following figures and detailed description, wherein the process is conventional unless otherwise specified, and the starting materials are commercially available from a public disclosure without further specification.

In the following examples:

(1) selecting raw materials: purity of nickel, iron, cobalt, aluminum, chromium, carbon and silicon was 99.9 wt.%, respectively; the boron content in the ferroboron raw material of the non-metallic element boron is 20 wt.%.

(2) A preparation method of an alloy material with high resistivity and high elongation rate comprises the following steps:

smelting: weighing raw materials according to chemical components of the high-resistivity alloy material, and preparing a master alloy ingot by a vacuum induction melting method under the protection of argon;

remelting and casting: under the protection of argon, heating the master alloy ingot to 1400-1600 ℃ for remelting, and preparing a high-resistivity alloy material by using a turnover casting method, wherein the current is 550A during turnover casting;

the vacuum degree in the melting, remelting and casting processes is 2.0 × 10^-3Pa, and the size of the alloy material is 50mm × 13mm × 40 mm.

(3) The prepared alloy material is subjected to structural characterization, resistivity and mechanical property test under the same conditions, wherein a phase structure adopts an X-ray diffractometer (D8 ADVANCE) of Bruker company, and the size of a test sample is 10 × 10 × 2mm³(ii) a The resistivity test was performed by a four-point probe method using the Japanese vacuum technology corporation (ULVAC)Model ZEM-2 conductivity meter, sample size 18 × 3 × 2mm³(ii) a The mechanical property test adopts a CMT4305 type microcomputer electronic universal testing machine to carry out room temperature quasi-static tensile test, the test sample is made into an I-shaped sample according to the relevant regulations in the GB/T228.1-2010 metal material room temperature tensile test method, the sample thickness is 1.0mm, the width is 3.14mm, the length of a parallel segment is 10mm, the gauge length is 5mm, and the strain rate is 10^-3s^-1。