阅读说明：本技术 高强度高铬铸金材料的热工艺处理方法 (Thermal process treatment method of high-strength high-chromium cast-alloy material ) 是由 朱文星 朱万军 于 2018-07-26 设计创作，主要内容包括：本发明属于铸件制造领域,具体涉及一种高强度高铬铸金材料的热工艺处理方法,包括下述步骤：1)熔炼：合金液包括如下组分：C 2.0-3.3％,Si 1.75-2.2％,Mn 1.3-2.6％,Cr 18-25％,Cu 0.1-0.3％,Nb 1.5-3％,V 0.3-0.8％,Ti 0.1-0.5％,N 0.03-0.05％,S≤0.05％,P≤0.05％,余量为Fe；熔炼温度为1600-1700℃；2)浇注；3)热处理。本申请通过高铬合金的合理配比,减少了贵重金属的含量,减少成本,得到的高强度高铬铸金材料的热工艺处理方法的硬度高,HPC能够达到70以上,冲击韧性强,冲击值达到15J/cm2。(The invention belongs to the field of casting manufacturing, and particularly relates to a thermal process treatment method of a high-strength high-chromium cast alloy material, which comprises the following steps: 1) smelting: the alloy liquid comprises the following components: 2.0 to 3.3 percent of C, 1.75 to 2.2 percent of Si, 1.3 to 2.6 percent of Mn, 18 to 25 percent of Cr, 0.1 to 0.3 percent of Cu, 1.5 to 3 percent of Nb, 0.3 to 0.8 percent of V, 0.1 to 0.5 percent of Ti, 0.03 to 0.05 percent of N, less than or equal to 0.05 percent of S, less than or equal to 0.05 percent of P, and the balance of Fe; the smelting temperature is 1600-1700 ℃; 2) pouring; 3) and (6) heat treatment. The content of precious metals is reduced and the cost is reduced through the reasonable proportion of the high-chromium alloy, the hardness of the obtained high-strength high-chromium cast alloy material is high by the thermal process treatment method, the HPC can reach more than 70, the impact toughness is high, and the impact value reaches 15J/cm 2.)

1. A thermal process treatment method of a high-strength high-chromium cast-alloy material is characterized by comprising the following steps:

1) smelting: the alloy liquid comprises the following components in percentage by weight: 2.0 to 3.3 percent of C, 1.75 to 2.2 percent of Si, 1.3 to 2.6 percent of Mn, 18 to 25 percent of Cr, 0.1 to 0.3 percent of Cu, 1.5 to 3 percent of Nb, 0.3 to 0.8 percent of V, 0.1 to 0.5 percent of Ti, 0.03 to 0.05 percent of N, less than or equal to 0.05 percent of S, less than or equal to 0.05 percent of P, and the balance of Fe; the smelting temperature is 1600-1700 ℃;

2) pouring: pouring the alloy liquid in the step 1), wherein the pouring temperature is 1400-1500 ℃, removing slag in the ladle during pouring, keeping the temperature at 850 ℃ for 3-5h at 650-850 ℃ after pouring, and opening the box to cool to room temperature to obtain a casting;

3) and (3) heat treatment: heating the casting obtained in the step 2) to 540-620 ℃ at the speed of 9-12 ℃/h, preserving the heat for 35-45min, naturally cooling to room temperature after air cooling to 150 ℃ and 200 ℃, and then heating to 220-250 ℃ at the speed of 9-12 ℃/h, preserving the heat for 2-3 h.

2. The thermal process treatment method for the high-strength high-chromium cast-gold material according to claim 1, characterized in that the following components are included in the step 1): 2.8 percent of C, 1.95 percent of Si, 2.0 percent of Mn, 22 percent of Cr, 0.2 percent of Cu, 2 percent of Nb, 0.5 percent of V, 0.3 percent of Ti0.04 percent of N, less than or equal to 0.01 percent of S, less than or equal to 0.01 percent of P, and the balance of Fe.

Technical Field

The invention belongs to the field of casting manufacturing, and particularly relates to a thermal process treatment method of a high-strength high-chromium cast alloy material.

Background

The wear-resistant material is reformed and opened for more than 30 years, vast scientific and technological workers in China are combined with production practice, and various novel wear-resistant materials are developed according to the specific working conditions and domestic resource conditions of equipment wear in China. Mainly divided into modified high manganese steel, medium manganese steel and ultrahigh manganese steel series; high, medium and low carbon wear resistant alloy steel series; chromium series wear-resistant white cast iron series; manganese series and boron series wear-resistant white cast iron and martensite and bainite wear-resistant nodular cast iron; bimetal composite wear-resistant materials produced by different methods; surface-treated wear-resistant materials, and the like.

The heat treatment method of the high-strength high-chromium cast-alloy material is a third-generation wear-resistant material developed by following the common white cast-alloy material and the nickel hard cast-alloy material. Due to the characteristics of the self organization of the thermal process treatment method of the high-strength high-chromium cast-alloy material, the thermal process treatment method of the high-strength high-chromium cast-alloy material has the performances of toughness, high-temperature strength, heat resistance, wear resistance and the like which are much higher than those of the common cast-alloy material. The thermal process treatment method of the high-strength high-chromium cast-alloy material is known as the best antiwear material in the present generation and is increasingly widely applied.

Disclosure of Invention

The invention aims to provide a thermal process treatment method of a high-strength high-chromium cast-alloy material.

In order to achieve the purpose, the invention adopts the following technical scheme:

a thermal process treatment method of a high-strength high-chromium cast-alloy material comprises the following steps:

1) smelting: the alloy liquid comprises the following components in percentage by weight: 2.0 to 3.3 percent of C, 1.75 to 2.2 percent of Si, 1.3 to 2.6 percent of Mn1, 18 to 25 percent of Cr, 0.1 to 0.3 percent of Cu, 1.5 to 3 percent of Nb, 0.3 to 0.8 percent of V, 0.1 to 0.5 percent of Ti, 0.03 to 0.05 percent of N, less than or equal to 0.05 percent of S, less than or equal to 0.05 percent of P, and the balance of Fe; the smelting temperature is 1600-1700 ℃;

2) pouring: pouring the alloy liquid in the step 1), wherein the pouring temperature is 1400-1500 ℃, removing slag in the ladle during pouring, keeping the temperature at 850 ℃ for 3-5h at 650-850 ℃ after pouring, and opening the box to cool to room temperature to obtain a casting;

3) and (3) heat treatment: heating the casting obtained in the step 2) to 540-620 ℃ at the speed of 9-12 ℃/h, preserving the heat for 35-45min, naturally cooling to room temperature after air cooling to 150 ℃ and 200 ℃, and then heating to 220-250 ℃ at the speed of 9-12 ℃/h, preserving the heat for 2-3 h.

Preferably, the composition comprises the following components: 2.8 percent of C, 1.95 percent of Si, 2.0 percent of Mn, 22 percent of Cr, 0.2 percent of Cu, 2 percent of Nb, 0.5 percent of V, 0.3 percent of Ti, 0.04 percent of N, less than or equal to 0.01 percent of S, less than or equal to 0.01 percent of P, and the balance of Fe.

Compared with the prior art, the invention has the beneficial effects that:

according to the high-chromium alloy, the content of precious metals is reduced and the cost is reduced through reasonable proportioning of the high-chromium alloy, the stretching strength and the impact toughness of the alloy are enhanced through increasing the Si element, the quantity of martensite can be increased through increasing the content of Mn, and the wear resistance of a casting is improved; the addition of Cu can separate out fine particles in the cooling process, and the strength of the casting is improved. Ti can combine with carbon and nitrogen to form high-melting point compound, which can be used as external crystal nucleus to refine crystal grains and improve strength and toughness. Meanwhile, the elements are dissolved in the matrix in a solid manner, so that the transformation from austenite to pearlite can be delayed, and the hardenability of the material can be improved; in the present application, by reducing the tempering temperature, the transformation of carbides is suppressed, the precipitation of carbides is reduced, and the stability of the retained austenite is improved. The hot process treatment method of the high-strength high-chromium cast-alloy material has the advantages that the hardness is high, the HPC can reach 68, meanwhile, the impact toughness is high, and the impact value reaches 12J/cm 2.

Detailed Description

In order to make the technical solutions of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the following preferred embodiments.