A kind of forging method of superalloy gh4099

Abstract

The invention discloses a forging method of superalloy GH4099, which specifically includes the following steps: before forging, homogenizing the GH4099 steel ingot at a temperature of 1150° C. for 48 hours; preheating the forging furnace, and placing the homogenized steel ingot in the forging process In the furnace, the forging heating is carried out in a neutral atmosphere. At this time, the temperature in the forging furnace is less than or equal to 500 °C, then the temperature is slowly raised to 890~910 °C, and the temperature is kept for more than 1 hour. ; Forge the steel ingot after forging heating, the forging temperature is greater than or equal to 1050℃, and the final forging temperature is greater than or equal to 980℃; then place the steel ingot in the forging furnace at 1140~1160℃ and keep it at 1140~1160℃ for more than 1h, keep the temperature at 1140~1160℃. After the end, repeat the above steps to complete the forging process, each forging deformation is greater than or equal to 10%; finally, the steel ingot obtained after forging is placed in a preheated hot furnace, and the steel ingot is slowly air-cooled to room temperature. During the forging and heating process of the present invention, the steel ingot is heated evenly, the cracking of the forged steel ingot can be effectively avoided, and the finished product rate can be improved.

Description

technical field [0001] The invention belongs to the technical field of high-temperature alloy forging, and particularly relates to a high-temperature alloy GH4099 forging method. Background technique [0002] GH4099 is a highly alloyed nickel-based aged sheet alloy, used cobalt Elements such as tungsten and molybdenum are used for solid solution strengthening, and elements such as aluminum and titanium are added for aging strengthening, so that the alloy has high thermal forcing, and can be used for a long time below 900 °C, and the maximum working temperature can reach 1000 °C. The alloy is stable in structure and has satisfactory cold and hot forming and welding process properties, and is suitable for manufacturing aerospace fairings and high temperature plate bearing welded structural parts such as aero-engine combustion chambers and afterburners. [0003] The existing forging process parameters of superalloy GH4099 are: forging furnace temperature≤700℃, heating temperat...

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Problems solved by technology

Since the high-temperature alloy GH4099 steel ingot is relatively thick, it is easy to crack due to uneven heating and deformation of the steel ingot during the forging process. The forged steel ingot is as follows: figure 1 As shown; at the same time, because Si, Al, S, P, B, Al, Ti and other elements in superalloys are easy to segregate between dendrites to form low-melting sulfides, oxides and silicates, reducing hot-working plasticity, Moreover, due to its complex alloying ratio and high alloying, superalloy GH4099 is prone to forging cracks and uneven grain size during the forging process, resulting in a low yield, generally 51%.

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