GH4169 high-temperature alloy special-cross-section large annular piece liquid forging and rolling composite forming method

Abstract

The invention discloses a GH4169 high-temperature alloy special-cross-section large annular piece liquid forging and rolling composite forming method which comprises the following steps: 1) smelting; 2) liquid forging: fixing a liquid forging mold on an indirect squeezing casting machine, pouring an alloy solution in constant volume into the liquid forging mold, wherein the pouring temperature is 1350-1400 DEG C, the pressurization speed is 35-40mm / s, the type filling time is 1-6 seconds, and the specific pressure is 350-400MPa; and keeping the pressure under the pressure for 35-90 seconds, thereby obtaining a near terminal cross section annular blank; 3) homogenizing: cooling the near terminal cross section annular blank to 1150-1160 DEG C, performing heat preservation for 20-30 hours, then rising the temperature to 1180-1190 DEG C, and performing heat preservation for 110-130 hours; 4) residue heat isothermal rolling: reducing the temperature of the near terminal cross section annular blank after homogenization to 1010-1120 DEG C, and carrying out residue heat constant temperature rolling on a radial and axial composite rolling annular machine; 5) heat treatment: performing heat preservation on the annular blank at a temperature of 715-725 DEG C for 8 hours, and then cooling to 615-625 DEG C in a furnace at a speed of 50 DEG C / h, performing heat preservation for 8 hours, and carrying out air cooling; and 6) finishing.

Description

technical field [0001] The invention relates to a short-process processing and forming method for large-diameter metal rings with complex cross-sections, in particular to a liquid die forging and rolling composite forming method for large-scale rings of GH4169 superalloy with different cross-sections. Background technique [0002] The special-shaped large ring parts of aero-engines or gas turbines made of GH4169 superalloy, such as parts such as brakes, have a harsh working environment. The special use environment puts forward almost strict requirements on the dimensional accuracy and comprehensive mechanical properties of the ring parts: on the one hand, the parts are required to have high-precision external dimensions to avoid subsequent machining, which wastes a lot of manpower and material resources and seriously reduces the performance of the ring parts. ; On the other hand, the parts are required to have an excellent organizational state in order to meet the requiremen...

AI Technical Summary

Problems solved by technology

[0004]1) The process is lengthy, with many procedures and low production efficiency;

[0005]2) The rolled and expanded ring blank needs to be prepared by punching, and the final cross-sectional shape needs to be guaranteed by cutting excess dressing, so the material utilization rate is low;

[0006]3) The machining process cuts off the metal flow line, resulting in a decrease in the comprehensive mechanical properties of the ring;

[0007]4) The preparation process requires repeated heating, resulting in coarse grains, severe surface oxidation, and large energy consumption

[0008]The Chinese patent with publication number CN 101817134A discloses a method for short-flow casting-rolling composite forming of metal rings. Although the method satisfies the beneficial effects of short production process and saving energy, materials and manpower to a certain extent, the method adopts centrifugal casting ring billet, which cannot meet the processing requirements of ring parts with complex cross-sections, and the comprehensive mechanical properties of the metal ring parts produced are The performance is still not up to the requirements of extreme environments