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GH742y alloy turbine disk blank preparation method

A turbine disc and blank technology, which is applied in the field of preparation of GH742y alloy turbine disc blanks, can solve the problems of low pass rate, high deformation resistance, and high alloying degree of turbine disc forging blanks

Inactive Publication Date: 2015-07-15
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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AI Technical Summary

Problems solved by technology

Due to the high degree of alloying, serious segregation, narrow deformation temperature range and high deformation resistance of GH742y alloy, the qualified rate of qualified turbine disc forging blanks produced by traditional casting deformation technology is low and the performance is also low.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The preparation method of the GH742y alloy turbine disk blank is characterized in that: the steps of the method are:

[0018] (1) Put the cleaned GH742y master alloy into the vacuum induction melting crucible of the spray forming furnace, use a mechanical pump, a Roots pump and a booster pump three-stage pump system to evacuate and send electricity to heat the master alloy, the vacuum degree is less than 1Pa;

[0019] (2) After the mother alloy in the induction furnace is cleaned, the temperature is raised to 1480 ° C ~ 1520 ° C, so that the composition and temperature of the melt are uniform, and Ar gas with a pressure of 0.1 MPa ~ 0.2 MPa is charged into the melting chamber and the atomizing chamber until 0.6MPa, the purity of Ar gas is greater than 99.999wt%, start the depositor rotation system, the rotation rate is 60-100 rpm, and then pour the liquid metal in the melting crucible into the heated tundish at a speed of 15Kg / min, The heating temperature of the tundish...

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PUM

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Abstract

The invention discloses a GH742y alloy turbine disk blank preparation method, and belongs to the field of advanced engine material preparation, the preparation method combines the technical advantages of high purity, fine grain tissue and no macrosegregation ingot billet of high temperature alloy vacuum induction melting and spray forming rapid solidification process, and a final size turbine disk blank piece is obtained by subsequent hot isostatic pressing and forging and machining, so that a produced GH742y alloy deposition billet has the characteristics of high strength, good plasticity and easily forging processing and the like; the thermal processing difficult problem caused by macrosegregation of GH742y alloy which is conventionally hard to deform is solved, the comprehensive properties of the alloy is further enhanced, and the cost is reduced.

Description

technical field [0001] The invention relates to a preparation method of a GH742y alloy turbine disk blank, which belongs to the field of advanced engine material preparation. Background technique [0002] Aero-engines are of great significance to the development of national defense and national economy, and are an important symbol reflecting the level of a country's science, technology, industry, and military strength. GH742y alloy is a refractory turbine disk alloy with high performance levels and service temperatures. Compared with the GH742 alloy, the alloy mainly made some adjustments in the alloy composition: 1) the content of three aging strengthening elements, Al, Nb and Ti, was increased; 2) the solid solution strengthening element W was increased, and the content of Mo was reduced at the same time. 3) The content of Cr is reduced, and the content of Co is increased; 4) The content range of V is specified, and the magnesium element is increased. Such composition ad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/03
Inventor 袁华张国庆李周许文勇刘娜
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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