High-temperature alloy mold material as well as preparation method and application thereof

Abstract

The invention discloses a high-temperature alloy die material which comprises the following alloy chemical components in percentage by mass: 0.02 to 0.05 percent of C, 17.00 to 20.00 percent of Cr, 2.00 to 3.00 percent of Mo, 1.50 to 2.50 percent of Al, 1.50 to 2.50 percent of Ti, 8.00 to 10.00 percent of Fe, 0.01 to 0.05 percent of B, less than or equal to 0.01 percent of S and the balance of Ni, and the sum of the mass fractions of the Al element and the Ti element in the alloy is not less than 3.50 percent. The invention further discloses a preparation method of the high-temperature alloy die material and application of the high-temperature alloy die material in die steel. According to the method, the problem that the surface wear resistance is insufficient when an existing commercial high-temperature alloy serves as a non-ferrous metal hot working mold material is solved, the aging treatment process and the ion nitriding process are fused, the technological process is obviously shortened, and meanwhile the ion nitriding technology is environmentally friendly.

Description

technical field [0001] The invention relates to a high-temperature alloy mold material, a preparation method and application thereof, and belongs to the technical field of metal processing. Background technique [0002] In the hot processing of non-ferrous metals, especially in the production process of hot extrusion, the mold is in a harsh service environment such as high temperature, high friction and high load. The quality and life of the mold play a key role in the production quality, cost and efficiency. Traditional non-ferrous metal hot extrusion dies are mainly die steel, such as 3Cr2W8V, 4Cr5MoSiV1 (H13), etc. The main problem of such iron-based materials is insufficient mechanical properties at high temperature, such as red hardness and high temperature toughness. In recent years, superalloys have begun to be used to manufacture non-ferrous metal hot extrusion dies. These alloys are based on nickel and have better high temperature resistance than steel. Because nick...

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Problems solved by technology

Traditional non-ferrous metal hot extrusion dies are mainly die steels, such as 3Cr2W8V, 4Cr5MoSiV1(H13), etc. The main problem of this type of iron-based materials is insufficient mechanical properties at high temperatures, such as red hardness and high temperature toughness, etc.

In recent years, superalloys have begun to be used in the manufacture of non-ferrous metal hot extrusion dies. This type of alloy is based on nickel and has better high temperature resistance than steel. Since the original design of nickel-based superalloys is for long-term use at high temperatures The bearing part does not consider the surface hardness required by the mold material. Therefore, when using commercial superalloys to manufacture non-ferrous metal thermal processing molds, the thermal strength is excessive and the wear resistance is insufficient, and the excessively high alloying degree makes the thermal conductivity of the material poor. The mold material is prone to thermal stress during the service process of alternating cold and hot, and even leads to cracking

[0003] Nitriding treatment is a common method to improve the surface hardness and wear resistance of steel, but for nickel-based superalloys, nitrogen atoms are almost insoluble in nickel, and stable nitrides cannot be formed at high temperatures, and nickel-based alloys face-centered The atomic stacking of the cubic crystal structure is relatively tight, which is not conducive to the diffusion of nitrogen atoms. The addition of a large number of alloy elements further reduces the diffusion ability of nitrogen in the alloy, making the nitriding of superalloys more difficult. The nitriding time of gas nitriding is generally More than 100 hours, and the depth of the nitriding layer is insufficient

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