Radial forging method for high temperature alloy step shaft

A high-temperature alloy and radial forging technology, applied in engine components, mechanical equipment, etc., can solve the problems of poor uniformity of structure and properties, exceeding the standard, and unstable quality of alloy step shaft products.

Active Publication Date: 2014-07-16
PANGANG GROUP JIANGYOU CHANGCHENG SPECIAL STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The current production process of GH901 alloy stepped shaft is steel ingot upsetting→drawing to step billet→finishing and drawing to ruler→rough turning→solid solution, aging→inspection→machining, however, using this fast forging machine The production process of GH901 alloy stepped shaft mainly has problems such as unstable product quality, serious surface cracks, poor uniformity of structure and performance, excessive ultrasonic flaw detection clutter, low yield and qualified rate, etc.
According to the statistical analysis of production, the comprehensive yield of products under this process can only reach 30-40%.

Method used

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  • Radial forging method for high temperature alloy step shaft
  • Radial forging method for high temperature alloy step shaft
  • Radial forging method for high temperature alloy step shaft

Examples

Experimental program
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Embodiment 1

[0040] will refer to figure 1 and Figure 2A to Figure 2E The specific steps of forging a steel ingot blank with a diameter of Φ550mm into a stepped shaft with a finished size of Φ295×435+Φ175×125+Φ125×1245mm will be described in detail using the superalloy stepped shaft radial forging method according to the present invention.

[0041]In this embodiment, the steel ingot data is as follows: the superalloy is GH901, the diameter is Φ550 mm, the length L=1500 mm, and the weight is 2800 kg.

[0042] First, the steel ingot is upset to H0 / 2 by the quick forging machine, and then drawn to an octagonal 360mm, and the cracks on the surface of the billet are cleaned, and the billet is provided for the radial forging machine (for example, 18MN radial forging machine).

[0043] refer to figure 1 , figure 1 It is a schematic diagram of the first stepped shaft (also called the pre-forged billet) obtained after the steel ingot is pre-forged by the radial forging hammer F. In this embodi...

Embodiment 2

[0050] In another embodiment according to the present invention, the specific steps of forging a steel ingot blank with a diameter of Φ550mm into a stepped shaft with a finished size of Φ246×380+Φ146×100+Φ105×1230mm in the radial forging method of a superalloy stepped shaft will be described .

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Abstract

The invention provides a radial forging method for a high temperature alloy step shaft. The method includes: upsetting and drawing out a steel ingot, and providing a blank to a forging machine; forging the blank in multiple passes, and pre-forging to form a first step shaft; forging the middle of the first step shaft in multiple passages so as to form a middle step shaft, and forming a transition section between the first step shaft and the middle step shaft, wherein pulling speed for forming the first step shaft is controlled to be 3-5.5m / min, deformation of each pass for forming the middle step shaft is controlled to be 10-25%, and pulling speed for forming the middle step shaft is controlled to be 3-5.5m / min. By control on forging frequency, reduction in pass and pull speed of the radial forging method and by control on final forging temperature, the property structure of a step shaft product is controlled, quality stability and structure property uniformity of the product are improved greatly while comprehensive yield and qualified rate of the product are increased greatly.

Description

technical field [0001] The invention relates to a new forming method for forging a high-temperature alloy blank, and more specifically relates to a forging processing method for a high-temperature alloy stepped shaft. Background technique [0002] High-temperature alloys refer to high-temperature metal materials that work for a long time under high temperature and certain stress conditions. They have excellent high-temperature strength, good oxidation resistance and thermal corrosion resistance, good fatigue performance, fracture toughness and other comprehensive properties. It is an irreplaceable key material for the hot end parts of the turbine engine. For example, the GH901 alloy is a nickel-iron-chromium-based superalloy based on Fe-43Ni-12Cr, which is strengthened by precipitation by adding Al and Ti to form an intermetallic compound γ'[Ni3(Ti,Al)], and by adding Mo for solid solution strengthening. , It has high yield strength and durable strength below 650°C, and has...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21K1/06
Inventor 谢炜
Owner PANGANG GROUP JIANGYOU CHANGCHENG SPECIAL STEEL
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