Hot-forming and forging method for large-sized high-temperature alloy turbine disc

Abstract

The hot forging process of high temperature large alloy turbine disc includes the following steps: 1) conventional upsetting and drawing to form cylindrical alloy blank of 730 mm diameter with electroslag ingot of 900 mm diameter; 2) low temperature heating the blank at 900 deg.c, coating the sides with diathermic cotton, further heating to stipulated temperature and maintaining for prolonged 5 hr; 3) upsetting the blank to intermediate blank of 1700 mm diameter through the first traditional process to machining limit of the press and then local deforming with rectangular upper anvil of width below 400 mm; 4) coating the lower surface of the circular cake blank and heating in furnace for 2 hr; and 5) final rotary forging for local deformation with upper anvil of width of 200 mm and rotating angle of 15 deg to forge the intermediate blank of 1700 mm diameter into finished product of 2000 mm diameter in the reducing amount of 25 mm and deformation amount of 35 %.

Description

technical field [0001] The invention relates to a hot working and forging process method of a superalloy in the metallurgical industry, in particular to a hot working forming process method for a high temperature alloy turbine disc. Background technique [0002] Superalloys are important metal materials necessary for modern aero-engines, rocket engines, and gas turbines. It can withstand greater stress and be used for a long time under high temperature (generally 600-900°C), oxidizing atmosphere and gas corrosion conditions. High-temperature alloy turbine disk is a common high-temperature alloy product, and it is a key material for gas turbines (gas turbines have the characteristics of high efficiency, low cost, and low pollution), and they are widely used. With the development of social science and technology, the capacity of gas turbines is increasing, and the size and weight of superalloy turbine disks are also becoming larger. At present, the design and development of h...

AI Technical Summary

Problems solved by technology

To sum up, if the traditional forging process is adopted, large superalloy turbine disks with a diameter of 2000mm (used for heavy-duty gas turbines of 100,000 to 200,000 kilowatts) cannot be produced in China, and can only be produced in foreign countries with hydraulic presses of 5 to 7.5 tons. If forging is carried out on the ground, it means that the core material of our gas turbine is monopolized by foreign countries, and it is impossible to realize the localization of heavy-duty gas turbines, let alone the development of Chinese gas turbines.