Method for manufacturing nickel-based high-temperature alloy forge piece

Abstract

The invention relates to the technical field of forge process, and provides a method for manufacturing a nickel-based high-temperature alloy forge piece. The method comprises the following steps of: (1) inspecting nickel-based high-temperature alloy raw materials, including re-inspection of chemical components and inspection of steel ingot surface; (2) blanking by adopting a sawing machine sawing method or a chopper hot chopping method; (3) heating the steel ingot; (4) cogging and performing forge deformation treatment; (5) performing last but one heating number forging and last heating number forging; (6) rough processing; (7) heat treating; (8) testing mechanical performance; (9) detecting faults with ultrasonic wave; and (10) inspecting products. According to the manufacturing method provided by the invention, home-made manufacture of nickel-based high-temperature alloy forge pieces achieves a success, utilization of China to the nickel-based high-temperature alloy is broken through, and the quality and grade of products of China can be improved, the requirement of domestic market for high-quality valve rods and valve discs of a steam turbine, seal rings in various specifications and critical parts in aerospace field can be fulfilled, and the competitive capability of native enterprises in the international market can be improved.

Description

Technical field [0001] The invention relates to the technical field of forging technology, in particular to a method for manufacturing a nickel-based high-temperature alloy forging. Background technique [0002] Nickel-based superalloy (NiCr20TiAl) is a nickel-chromium matrix, aluminum and titanium are added to form a γ'phase dispersion strengthened superalloy. The service temperature is 700-800℃, and it has good high temperature creep resistance and resistance at 650-850℃. Relaxation and anti-oxidation performance, currently mainly used in the manufacture of important parts such as the valve stem and valve disc of million-level ultra-supercritical steam turbines, various specifications of sealing rings, and the manufacturing of engine rotor blades in the aviation field. The room temperature structure of the nickel-based superalloy is austenite, in which the content of chromium is very high. In order to obtain a higher hardness value, the content of titanium and aluminum is gener...

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Problems solved by technology

[0003] Prior to this, we mostly used the method of directly processing bars into parts in the manufacture of steam turbine valve stems and discs, sealing rings of various spec

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