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Chromium nickel alloy cast heat resistant steel casting
According to the matrix elements can be divided into iron based superalloy, nickel based superalloy and cobalt based superalloy. Inconel X-750 alloy nickel-chromium alloy steel plate round rod used in nickel-based heat-resistant casting can be divided into deformation superalloy, cast superalloy and powder metallurgy superalloy according to the preparation process. According to the reinforcement method, there are solid solution reinforcement type, precipitation reinforcement type, oxide diffusion reinforcement type and fiber reinforcement type. Superalloy is mainly used for the manufacture of high temperature components such as turbine blades, guide blades, turbine disks, high pressure compressor disks and combustion chambers for aviation, ship and industrial gas turbines. It is also used for the manufacturing of energy conversion devices such as aerospace vehicles, petrochemical equipment and coal conversion.
fabrication process
High-temperature alloy containing no or less aluminum and titanium, generally using electric arc furnace or non-vacuum induction furnace smelting. Inconel X-750 nickel-based alloy nickel-chromium alloy steel plate round rod with aluminum, titanium high superalloy if smelting in the atmosphere, the element loss is not easy to control, gas and inclusions into more, so vacuum smelting should be used. To further reduce the content of the inclusion and improve the distribution status of the inclusion and the crystallization organization of the ingot, the duplex process combining smelting and secondary remelting can be adopted. The main means of smelting are electric arc furnace, vacuum induction furnace and non-vacuum induction furnace; the main means of remelting are vacuum self-consumption furnace and electric slag furnace.
Solid solution reinforced alloy and alloy ingot containing aluminum and titanium low (the total amount of aluminum and titanium is less than 4.5%) can be forged to billet; aluminum containing titanium high alloy should be squeezed or rolled to billet, and then hot rolled into materials, some products need further cold rolling or cold pull. The alloy ingot or cake material with large diameter should be forged by hydraulic press or fast forging hydraulic press.
Alloys with a high degree of alloying and not easy to deform are currently widely used in precision casting, such as casting turbine blades and guide blades. In order to reduce or eliminate the grain boundary perpendicular to the stress axis in casting alloy and reduce or eliminate loose, directional crystallization process has been developed in recent years. This process makes the grain grow in a crystalline direction during alloy solidification to obtain parallel cylindrical crystals without transverse grain boundary. The primary process condition for achieving directional crystallization is to establish and maintain a large enough axial temperature gradient and good axial heat dissipation conditions between the liquid phase line and the solid phase line. In addition, in order to eliminate all grain boundaries, the manufacturing process of single crystal blade should be studied.
Powder metallurgy process, mainly used to produce precipitation reinforced type and oxide dispersion reinforced type superalloy. This process can obtain plasticity or even superplasticity.
The performance of the comprehensive treatment of the superalloy is closely related to the organization of the alloy, and the organization is controlled by the metal heat treatment. Supertemperature alloys generally require heat treatment. Precipitation-reinforced alloys are usually subjected to solid solution treatment and aging treatment. Solid solution reinforced alloy only through solid solution treatment. Some alloys have to undergo one or two intermediate treatments before aging. The solid solution treatment was first performed to dissolve the second phase into the alloy matrix to
In the aging treatment, γ, carbide (cobalt base alloy) and other enhanced phase evenly precipitated, then in order to obtain the appropriate grain size to ensure high temperature creep and persistence.
The temperature of the solid solution treatment is generally 1040~1220℃. It is widely
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