Liquid forging and rolling composite molding method of nickel-base superalloy hetero-cross-section large ring piece

Abstract

The invention provides a liquid forging and rolling composite molding method of a nickel-base superalloy hetero-cross-section large ring piece. The liquid forging and rolling composite molding method comprises the following steps of: smelting, liquid forging, homogenization, waste heat isothermal rolling, heat processing and finishing. The step of liquid forging comprises: fixing a liquid forging mold on an indirect extrusion casting machine, subsequently casting a certain quantity of obtained nickel-base superalloy solution to the liquid forging mold, wherein the casting temperature is 1350-1450 DEG C, the pressuring speed is 35-50mm / s, the mold filling time is 1-6s, the specific pressure is 300-400MPa; and keeping the pressure for 35-90 seconds under the pressure so as to obtain a final cross section nearest ring blank. The step of waste heat isothermal rolling comprises: carrying out waste heat isothermal rolling on a radial axis composite ring rolling machine after the final cross section nearest ring blank subjected to homogenization is cooled to 1020-1140 DEG C. By utilizing the liquid forging and rolling composite molding method of the nickel-base superalloy hetero-cross-section large ring piece, not only can the blank manufacturing process of the alloy ring piece be simplified, the cost is reduced and the production efficiency is improved, but also the micro-texture state of the nickel-base superalloy ring piece is improved, and the comprehensive mechanical property is improved.

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 nickel-base superalloys with different cross-sections. Background technique [0002] Large-scale rings made of nickel-based superalloys are mainly used in aviation, aerospace, oil and gas and other fields, and the working environment is harsh. 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 requ...

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