Extrusion breakdown method for high-temperature alloy cast ingot for turbine disc

Abstract

The invention discloses an extrusion breakdown method for high-temperature alloy cast ingot for a turbine disc, and the embodiment provides an extrusion breakdown method for difficult-to-deform high-temperature alloy cast ingot for the turbine disc. The extrusion breakdown method comprises the following steps of: (1) designing and manufacturing an extrusion mould with taper; (2) heating difficult-to-deform high-temperature alloy cast ingot blank, and pressing the difficult-to-deform high-temperature alloy cast ingot into the extrusion mould by a press, thereby completing first-pass extrusion; (3) re-heating the extruded blank, re-pressing the blank into the mould in a mode that the upper part of the blank is thin and the lower part of the blank is thick to complete next-pass extrusion; and (4) repeating operation in the step (3) to complete positive-negative multi-pass extrusion, thereby obtaining an extruded part. The extrusion breakdown process is low in tonnage requirement on equipment, is high in raw material utilization rate; and the obtained extruded part is complete in appearance, has section which is not reduced in comparison with that of the blank, has a fine and uniform grain structure, and is remarkably improved in performance.

Description

technical field [0001] The invention relates to an extrusion blanking method of a high-temperature alloy ingot for a turbine disk, and belongs to the technical field of turbine disk preparation. Background technique [0002] Turbine disks are the core components of aero-engines with critical properties. Its metallurgy, manufacturing quality and performance level have a decisive influence on the reliability, safety life and performance improvement of engines and aircraft. The preparation of advanced high-temperature alloy blanks for high-performance turbine disks is an important link in the development and production of advanced engines. The blanks of advanced superalloys must first be pure, uniform and fine-grained. Because only by developing such a blank, and with the cooperation of advanced turbine disk forging technology and heat treatment process, can the integrity and reliability of the turbine disk, the uniformity of the disk structure, high performance and minimum p...

AI Technical Summary

Problems solved by technology

However, the conventional extrusion blanking mainly has the following disadvantages: (1) The cross-section of the extruded part is small and easy to bend

This makes the extruded workpiece bend and deform, which is not conducive to subsequent upsetting or forging. At the same time, studies have shown that the microstructure grains on the interface of the curved extrusion part are coarse, which affects the microstructure uniformity of the turbine disc forging

(2) Limitation of equipment tonnage

To obtain large-sized turbine discs, large-diameter smelting ingots are required, which requires large-tonnage smelting or extrusion equipment. Therefore, the cost of this process equipment is relatively high, and it is also limited by the existing domestic conditions.

(3) Low utilization rate of materials

The "tail pressing" and "head pinching" of materials in the conventional extrusion blanking process consume a lot, which reduces the metal utilization rate. At present, the material utilization rate of the turbine disc die forging is only 10% to 30%, wasting a lot of strategic alloy elements

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