Iron-based metallurgy and preparation method thereof


A superalloy is a special alloy based on iron and alloyed with various elements to improve its high-temperature mechanical properties and high-temperature corrosion resistance. Compared with nickel-based and cobalt-based superalloys, superalloys are a kind of high-temperature structural materials widely used in the fields of national defense, energy, aviation and nuclear reaction. The traditional application field of superalloys is aircraft engines. Although there are many kinds of existing iron-based metallurgy, with the development of industrialization in China, the demand for high-temperature alloy materials in various civil industries is increasing, which is far from meeting the needs of industrial development. Therefore in the existingiron-based metallurgyOn the basis of this, we have developed an iron-based metallurgy with ideal toughness and wear resistance, as well as good weldability, hardness and workability.


Technical points: In view of the above technical problems, technicians provide airon-based metallurgyand preparation method thereof. Adding rare earth composite reinforced materials, the prepared iron-based metallurgy is alloyed with a variety of elements, and then heat treated to make the iron-based alloy have ideal hardness and mechanical properties. In order to achieve the above object, the iron-based metallurgy adopts a technical scheme that the iron-based metallurgy is composed of raw materials with the following mass percentages: chromium 4.5-5.8%, silicon 0.4-0.8%, carbon 0.41-0.48%, graphene composite material 1.2-1.6%, manganese 1.0-1.5%, and tungsten 0.8-1.2%.

       铁基冶金

1. graphene oxide treatment: preparing an aqueous solution of graphene oxide with a mass concentration of 2-4 mg/ml, dispersing the graphene oxide powder in deionized water, and then performing ultrasonic treatment with an ultrasonic cleaning machine with a power of 60-100w for 25-30 minutes to obtain a completely dispersed graphene oxide aqueous suspension system, wherein the temperature of the ultrasonic cleaning machine is adjusted to 20-25 degrees;


Preparation of 2. rare earth element modified graphene: adding an appropriate amount of polyethyleneimine to the graphene oxide aqueous suspension system obtained in step 1, then adding an appropriate amount of lanthanum nitrate to ultrasonic dispersion for 20-24h, cooling to 70-80 degrees after reflux, continuing ultrasonic treatment for 2-4h, refluxing at 100-105 degrees for 20-24h, adding 50% hydrazine hydrate by mass fraction to continue reaction for 6-8h; after the reaction, the uniformly mixed suspension system is subjected to vacuum filtration, washing and vacuum drying, and calcined at 450-500 ° C. for 5-8 hours to obtain a rare earth lanthanum/polyethyleneimine-graphene composite material. The iron-based metallurgical rare earth lanthanum/polyethyleneimine-graphene composite material combines the advantages of graphene and rare earth oxides, and adds a high-molecular polymer with strong adhesion, which is conducive to the adhesion of rare earth elements on the surface of graphene. At the same time, the composite material not only has the strong toughening effect of graphene on the alloy, but also has the refining effect of rare earth elements on the alloy; and rare earth lanthanum does not form intermetallic compounds with iron, which can play the active role of rare earth itself.


The preparation method of iron-based metallurgy includes smelting process and heat treatment process; The smelting process includes the following steps: 1. Batching smelting: batching according to the mass percentage of raw materials, heating to 1530-1550 degrees until all raw materials are melted, smelting into metal melt, and keeping the temperature for 5-10 minutes; 2. Refining and standing: skim off the surface scum of the metal melt obtained in step (1), refine for 3-5-5-5 minutes, let stand for 8-10min;3. Pouring: When the temperature of the refined molten metal drops to 1500~1520, the iron-based alloy is poured and formed to obtain the iron-based alloy. The heat treatment process is to treat the iron-based alloy obtained by smelting at 1000~1050 for 2~4h, and then age at 500~600 for 6~10h.


Aboveiron-based metallurgyThe beneficial effect is that the iron-based metallurgy is compound alloyed with a variety of elements, boron and rare earth composite reinforcing materials are added, smelting and pouring first, and then heat treatment is performed, which improves the toughness and wear resistance of the iron-based metallurgy, and has good hardness, Welding and workability, service life has also been improved.


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