Process of making ring fine crystal blank of GH4169 alloy for near constant temperature forging

Abstract

The technological process of making ring fine crystal blank of GH4169 alloy for near constant temperature forging includes the following steps: heating the GH4169 alloy rod to 980-1010 deg.c, upsetting into the first cake blank of thickness in 1 / 3-1 / 2 the rod height, drawing the cake blank to secondary rod of original height, heating the secondary rod to 980-1010 deg.c, upsetting into the secondary cake blank of thickness in 1 / 3-1 / 2 the rod height, punching hole in the secondary cake blank, heating the cake blank to 980-1010 deg.c, and rolling to obtain ring fine crystal blank of 35-45 % deformation. The ring fine crystal blank may be near constant temperature forged into forging with fine crystal grains.

Description

technical field [0001] The invention relates to a blank-making method for a deformed high-temperature alloy forging blank, in particular to a method for making a fine-grained ring blank for near-isothermal forging of a GH4169 alloy. Background technique [0002] GH4169 alloy is a precipitation-strengthened nickel-chromium-iron-based superalloy. Due to its high strength and narrow deformation temperature range, the alloy has a large deformation resistance and is difficult to forge. When the alloy is nearly isothermally forged, in order to obtain a high-strength forging with fine grains, it is first necessary to make the grains of the forged blank fine. [0003] The Chinese invention patent specification CN1500577A (application number: 200310103692.4) published on June 2, 2004 discloses a quasi-isothermal forging of a nickel-based superalloy. The quasi-isothermal forging is similar to the near-isothermal forging described in the present invention. Only the temperature differe...

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Problems solved by technology

This patent application does not fully disclose how to use casting or forging billets with fine grains for forging, and the original blanks of casting, forging or rolling are relatively coarse in grains, so the forging method provided by this patent application is used to process the original blanks. It is difficult to obtain forgings with fine grains after forging

The crystal grains of the consolidated powder billet are relatively small, but there are also the following problems: First, the consolidated powder billet needs special metal powder making technology and powder making equipment to produce, but at present, due to the difficulty of metal powder making technology and powder making The high investment in equipment makes the cost of the consolidated powder billet higher and the price is more expensive; second, the metal powder technology needs to overcome many technical problems, resulting in the unstable quality of forgings produced by using the consolidated powder billet; The metal powder making technology belongs to Fangxing technology, which has not been widely used, which makes it difficult to obtain consolidated powder blanks

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