Method for smithing GH4169 alloy plate shaped forgeable piece in air at an approximately equal temperature

Abstract

The invention discloses a close isothermal forging method of GH4169 alloy tray-shaped forging in the air, the technological process is that: making GH4169 finegrain roughcast adopting method of upsetting, punching and rolling after heating GH4169 alloy original rod material to 995-1005 DEG C; respectively heating the finegrain roughcast to 995-1005 DEG C and forging die to 950-965 DEG C; diefilling and positioning the finegrain roughcast; while heating finegrain roughcast and forging die to keep the heating warm humidity; forging die and forging press the finegrain roughcast forming under the 55MN to 65MN forging pressure and 0.01s-1 to 0.05s-1 strain rate; obtaining the tray-shaped forging; water-cool processing the tray-shaped forging. Adopting forging method of the invention can realize forming of the GH4169 alloy material tray-shaped forging difficult to deform and obtain the GH4169 alloy tray-shaped forging with weensy crystal grain, high intensity and complicated shape.

Description

technical field [0001] The invention relates to a forging method of a deformed high-temperature alloy forging, in particular to a near-isothermal forging method of a GH4169 alloy disc-shaped forging in air. Background technique [0002] GH4169 alloy is a precipitation-strengthened nickel-chromium-iron-based high-temperature alloy. The alloy has high strength. The disc-shaped forgings of this alloy, such as turbine discs, are widely used in the core of aerospace engines such as aviation and aerospace below 650 ° C. The hot-end parts can work for a long time in the environment of high temperature, high stress, high speed, and high-speed airflow, and adapt to the extreme working environment requirements of harsh service environment, heavy workload, and high failure frequency. Due to the high strength and narrow deformation temperature range of this alloy, its deformation resistance is relatively large, which makes forging difficult. In addition, in order to obtain high-strength...

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Problems solved by technology

This patent application does not fully disclose how to obtain a fine-grained billet or forging by using a casting-forging billet for forging. However, the original billet for casting or forging has a relatively coarse grain, and the forging method provided by this patent application is used to obtain a fine-grained billet or forging. After the blank is forged, it is difficult to obtain forgings with fine grains

Consolidated powder blanks are used for quasi-isothermal forging. First, the consolidated powder blanks require special metal powder-making technology and powder-making equipment to produce. At present, due to the difficulty of metal powder-making technology and the high investment in powder-making equipment, solid The cost of the consolidated powder billet is relatively high and the price is relatively expensive; secondly, the quality of the forgings produced by the consolidated powder billet is in an unstable state due to the many technical difficulties that need to be overcome in the metal powder making technology; the third is that the metal powder making technology belongs to the square It is a new technology, but it has not been popularized and applied, so it is difficult to obtain consolidated powder blanks

In addition, the forging method described in this patent application only heats the forging die during the forging process, so that the forging blank is exposed to the air during the forging process, which is not conducive to maintaining the temperature of the forging blank; and the temperature of the forging die is quasi-isothermal with the blank The temperature difference of forging is 56℃~250℃. Due to the large temperature difference range, it is not conducive to accurately control the thermal parameters of forgings and obtain forgings with excellent structure and performance; Quasi-isothermal forging is also not mentioned

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