High-temperature alloy and hot isostatic pressing sintering method thereof

Abstract

The invention relates to a high-temperature alloy and a hot isostatic pressing sintering method thereof. The high-temperature alloy comprises the following components in percentage by weight: 0.4 to 0.5 percent of carbon, 17.0 to 19.5 percent of chromium, 21.0 to 23.5 percent of nickel, 2.0 to 3.0 percent of tungsten, 22.5 to 25.5 percent of cobalt, 4.0 to 5.0 percent of niobium, 10.5 to 12.5 percent of molybdenum, less than or equal to 1.2 percent of silicon, less than or equal to 0.04 percent of phosphorus, less than or equal to 0.03 percent of sulfur, less than or equal to 0.3 percent of manganese, and the balance iron and impurities. The method comprises the following steps of: melting the raw materials in a smelting furnace to obtain alloy liquid; impacting the alloy liquid by argon or helium to obtain solid powder; and performing the hot isostatic pressing sintering on the solid powder in an inert gas atmosphere placed into a hot isostatic pressing furnace to obtain the high-temperature alloy. Compared with the high-temperature alloy obtained by the conventional sintering method, the porosity of the high-temperature alloy is 0.0001 percent below, even can be eliminated completely; and the high-temperature alloy has higher strength and hardness.

Description

technical field [0001] The invention relates to a high-temperature alloy and a hot isostatic pressing sintering method thereof, in particular to a hot isostatic pressing sintering method of a high-temperature alloy PM1, which belongs to the technical field of metal material preparation. Background technique [0002] The superalloy PM1 (Fe-18Cr-23Co-22Ni-11Mo-2W) is generally manufactured by vacuum sintering through molding, and has the characteristics of high strength and high hardness. kinds of parts. This has relatively high requirements for material properties, and generally requires that the apparent density of superalloys after sintering should be 8.2g / cm 3 , the Vickers hardness should meet Hv300-400, and the tensile test should meet the standard values ​​shown in Table 1 below. The test standard at room temperature should refer to GB / T 228-2002, and the test standard at high temperature should refer to the national standard GB / T 4338- carried out in 2006. [0003] ...

AI Technical Summary

Problems solved by technology

However, the current superalloy PM1 cannot completely eliminate a small amount of pores and defects inside the cemented carbide sintered body after vacuum sintering, which greatly affects the performance of cemented carbide products, and it is easy to produce waste products in mass production

Moreover, the raw material powder needs to be molded before sintering, and the price of the mold used for molding is relatively high, and the production cost of the alloy is too high

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