Die forging method of high-temperature alloy

Abstract

The invention discloses a die forging method of a high-temperature alloy; the method comprises the following steps: a) die forging stock is in thermal insulation and heat preservation, and clad with thermal insulation cotton; b) heating of the die forging stock: the die forging stock clad with the thermal insulation cotton is heated in a heating furnace and preserved at a temperature, the heating temperature is 900-1200 DEG C, and the heat preservation time is not less than 30 minutes; c) heating of a die: the die is put into a press, and heated to the working temperature of 600-650 DEG C in the heating furnace of the press; d) die forging: the die forging stock is taken out of the heating furnace and sent to an oil press or a hydraulic press for die forging, the amount of deformation is 40-80%, and the die forging speed is 1-5mm / s. The die forging method of the invention solves the problem of slow heating-up of the die forging stock in the heating furnace resulting from the existing 'compound jacketing' mode, improves the heat preservation effect of workpiece, and lower the cost for the application of heat insulating materials; the die forging method adopts a lower die temperature, which sufficiently eliminates the problems of short service life of the hot press forging die and great production difficulty, and facilitates producing the alloy forged pieces conforming to finecrystalline requirements.

Description

technical field [0001] The invention relates to a forging hot-working deformation process of a high-temperature alloy, in particular to a die forging method for a high-temperature alloy such as GH4169. Background technique [0002] GH4169 alloy, known as the pillar of superalloys, is the most widely used superalloy variety in the world; according to the grain structure of GH4169 alloy products, it can be divided into coarse-grained products and fine-grained products. GH4169 alloy fine-grained forgings (with fine-grain characteristics and δ-phase spheroidization characteristics), due to their good low-cycle fatigue performance and high-cycle fatigue performance, and good comprehensive balance of strength and toughness, they are used in key components or important parts of high-tech power devices. components have been widely used. [0003] For this GH4169 alloy fine-grained die forging, in order to prevent grain coarsening during heat treatment, the solid solution temperature...

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Problems solved by technology

[0013] The purpose of the present invention is to provide a die forging method for superalloys, which solves the shortcomings of the existing "composite sheathing" method that causes the die forging billet to heat up slowly in the heating furnace, and improves the heat preservation effect and operability of the heat insulating cotton material on the workpiece , and reduce the cost of applying thermal insulation materials; on the other hand, to achieve good thermal insulation of the workpiece, so that a lower mold temperature can be used, which can fully alleviate the problems of low life and difficult manufacturing of hot forging dies, and finally, manufacture Fine-grain requirements such as GH4169 alloy forgings meet the application requirements of key components (or important components) of high-tech power plants

On the one hand, compared with the existing heat insulation sheet + stainless steel plate composite sheath heat preservation die forging technology, it solves the shortcomings of the "composite sheath" method that causes the die forging billet to heat up slowly in the heating furnace, and improves the heat insulation effect and reliability of the heat insulation cotton material on the workpiece. Operability, and reduce the cost of the application of thermal insulation materials; on the other hand, due to the application of stickable thermal insulation cotton can achieve good thermal insulation of the workpiece, so that a lower mold temperature can be used, which can fully alleviate the low life of the hot forging die and the manufacturing process. difficult problem

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