Manufacturing method of ultra-fine grain high-temperature alloy plate blanks

Abstract

The invention discloses a manufacturing method of ultra-fine grain high-temperature alloy plate blanks. The manufacturing method comprises the following steps of 1, preparation of high-temperature alloy powder; 2, heat treatment of the high-temperature alloy powder; 3, selection of a high-temperature alloy core tube; 4, high-temperature spray deposition and composite recrystallization of plate blanks; and 5, heat treatment of the plate blanks, and finally forming the high-temperature alloy plate blanks in ultra-fine microstructures. According to the manufacturing method disclosed by the invention, the high-temperature alloy powder is prepared by adopting a gas atomization technology, and the obtaining of an oxygen-free and segregation-free well-closed formation is controlled through a heat treatment system; the element composition is controlled by selecting the high-temperature alloy core tube, and the real-time control for the temperature during a forming process is controlled; and the forming of high-temperature alloy is carried out on the outer surface of the high-temperature alloy core tube by adopting the high-temperature spray deposition technology, the composite recrystallization is synchronously carried out, the growth of grains in the microstructure is controlled as a large temperature gradient is simultaneously formed, and the high-temperature alloy plate blanks in the ultra-fine microstructures are finally formed through the heat treatment. According to the manufacturing method disclosed by the invention, the microstructure of the plate blanks is compact, the size is large, and most of all, a forging machine or an extrusion device in large tonnage is not needed.

Description

technical field [0001] The invention relates to a manufacturing technology of a high-temperature-resistant alloy blank, in particular to a manufacturing method of an ultra-fine-grained high-temperature alloy blank. 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 discs are high-temperature alloy products, and the most used ones are gas turbine discs and aircraft turbine discs. [0003] Turbine discs for aircraft, the center of the disc is subject to low temperature and high stress, and requires fine-grained structure to ensure sufficient tensile strength and fatigue resistance, while the edge is subjected to high temperature and low stress, requiring coarse grains to ensure sufficient creep and dura...

AI Technical Summary

Problems solved by technology

Due to the continuous increase of strengthening elements, the thermal process performance deteriorates, and it can no longer be deformed by thermal processing. It can only be used in the as-cast state, and the as-cast alloy has serious segregation, which cannot meet the needs of new engines.

[0004] Chinese patent CN101307402 introduces thermal deformation processing technology, and the process window is small

Since there is no large-tonnage extrusion equipment in our country, the extrusion + superplastic forging process cannot be implemented; for isothermal forging and superplastic forging, fully enclosed forging equipment and devices under the protection of vacuum or inert gas and large-tonnage special presses for isothermal forging are required. huge investment

Therefore, foreign methods are currently difficult to implement in my country. The lack of large-tonnage extruders, isothermal forging presses, and fully enclosed forging equipment has become a major obstacle restricting the development of my country's large-scale powder superalloy disc manufacturing technology.

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