Manufacturing method of GH3600 nickel alloy extruded tube

Abstract

The invention provides a manufacturing method of a GH3600 nickel alloy extruded tube. The manufacturing method comprises the following steps of: 1, performing machining treatment on a GH3600 nickel alloy ingot casting, thereby obtaining an extruded ingot blank; 2, jacketing the extruded ingot blank so as to obtain a jacketed ingot blank; 3, heating the jacketed ingot blank and performing isothermal extrusion on the jacketed ingot blank, thereby obtaining an extruded tube blank; 4, performing straightening treatment; and 5, removing the jackets on the internal and external surfaces by acid washing, thereby obtaining the GH3600 nickel alloy extruded tube, wherein the inner diameter of the GH3600 nickel alloy extruded tube is in the range from 18 mm to 22 mm, and the outer diameter of the GH3600 nickel alloy extruded tube is in the range from 28 mm to 34 mm. The preparation method provided by the invention is simple, good in repeatability and suitable for industrial large-scale production. The GH3600 nickel alloy extruded tube prepared by the method provided by the invention is high in yield, high in grain size number, good in dimensional homogeneity and less in subsequent processing steps; and therefore, the GH3600 nickel alloy extruded tube meets the technical requirements for aerospace extruded tubes and has a high popularization value and an obvious economic benefit.

Description

technical field [0001] The invention belongs to the technical field of superalloy materials for aerospace, and in particular relates to a method for preparing a GH3600 nickel alloy extruded pipe. Background technique [0002] GH3600 nickel alloy is a nickel-based solid-solution strengthened austenitic superalloy whose main component is nickel-chromium-iron. GH3600 nickel alloy has good high-temperature corrosion resistance and oxidation resistance, as well as excellent cold and hot processing and welding process performance, and is suitable for making anti-oxidation parts under 1100 °C that withstand low loads. Based on the above characteristics, GH3600 nickel alloy is widely used in fluid conveying pipes under high temperature and high pressure environment, and is widely used in aerospace field. Due to its special application environment, GH3600 nickel alloy pipes need to have good stability in high temperature and high pressure environments. Correspondingly, GH3600 nickel...

AI Technical Summary

Problems solved by technology

[0004] But so far, few technicians have been able to use the traditional extrusion method to prepare high-precision GH3600 nickel alloy extruded pipes for aerospace. There are four reasons for this: 1. The traditional extrusion process usually sets the extrusion temperature at 1150°C~ In the range of 1250°C, under such high temperature conditions, the erosion and wear damage of extrusion barrels, extrusion dies and other equipment are very serious, resulting in poor dimensional uniformity of the extruded pipes such as outer diameter and wall thickness; 2. At 1150°C Extrusion under high temperature conditions of ~1250°C will lead to severe surface oxidation and obvious surface defects of the extruded pipe. In the subsequent processing, machining is often required to remove the oxide layer and defects on the surface, resulting in more subsequent processing procedures and the finished product of the pipe Third, due to the conventional process of GH3600 nickel alloy in order to reduce the wear of the mold, the extrusion speed is about 100mm / s, and the extrusion process will produce a large deformation resistance, so the conventional extrusion process can generally only squeeze If the ratio is controlled between 6 and 8, the grain breaking effect is not obvious, and the grain size uniformity of the extruded pipe is poor; 4. In the conventional extrusion process, due to the large deformation resistance of the GH3600 nickel alloy, it is necessary to fully ensure the extrusion The compressive stress borne by the machine is within the safe range, which directly limits the specifications of the GH3600 nickel alloy extruded pipe; To ensure the extrusion process is safe and controllable

Therefore, the conventional extrusion process is generally suitable for extruded ingots and extruded pipes of larger specifications, and if the GH3600 nickel alloy extruded pipes of smaller specifications are prepared, subsequent processing is required, and the subsequent processing process is too long and the process Difficult to control, resulting in poor quality stability of the pipe

[0005] It can be seen from the above that the extruded pipes produced by the traditional extrusion process are of poor quality and have many defects, which will be inherited to the finished pipes, which will comprehensively affect the process performance of the finished pipes, resulting in a low yield of the finished pipes, or even scrapping the entire batch. Seriously hinder the application and development of GH3600 nickel alloy material

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