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Preparation method of GH4698 high-temperature alloy mold

A high-temperature alloy and mold technology, which is applied in the field of GH4698 high-temperature alloy mold preparation, can solve the problems of high cost, reduced life, temper softening, etc., and achieve the effects of wide chemical composition range, reduced manufacturing cost, and reduced smelting difficulty

Active Publication Date: 2021-02-26
中国第二重型机械集团德阳万航模锻有限责任公司
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Problems solved by technology

[0002] Commonly used rotating parts of aero-engines are high-temperature alloys such as GH4169. These rotating parts are usually in the form of die forgings. From the perspective of cost, the mold generally chooses hot-work die steel 5CrNiMo, and the operating temperature is 300 ° C. ℃, at this time, it will cause tempering softening, the wear of the mold will be intensified, the service life will be reduced, and the dimensional accuracy of the cavity will be deteriorated, which cannot meet the requirements of long service life.
The GH4698 superalloy die can be used to forge the common rotating parts of the GH4169 aero-engine, but the cost of the GH4698 superalloy die made of the traditional GH4698 superalloy forging rod is extremely high, and the economy has no advantages

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preparation example Construction

[0030] For solving technical problem of the present invention, GH4698 superalloy mold preparation method of the present invention comprises:

[0031] a. Heating the ingot to 1160-1180°C for the first forging, the total deformation in the forging process is less than 20%;

[0032] b. Heating the ingot after the first forging to 1160-1180°C for the second forging, the total deformation in the forging process is less than 25%;

[0033] c. Heating the ingot after the second forging to 1160-1180°C for the third forging, the total deformation in the forging process is less than 35%;

[0034] d. peeling the ingot after forging for the third time in step c to obtain a bar stock;

[0035] e. The bar material obtained in step d is subjected to three-fire upsetting to complete the module manufacturing. When the three-fire upsetting bar is upsetting, the deformation amount does not exceed 40%, and after the upsetting is completed, it is rounded to eliminate the influence of the belly;

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Embodiment 1

[0054] Determine the selected mold specification according to the external dimension of the die forging, and then add the machining allowance to the maximum external dimension of the mold to determine the size of the module blank, and add the amount of damage in the process of ingot opening, the amount of skin peeling in bar processing, and the damage of the upsetting process. Quantity, and finally determine the required GH4698 superalloy ingot size.

[0055] The mold specification required for a certain forging is φ920×370mm. According to the conversion, the required GH4698 superalloy ingot specification is φ610×905mm.

[0056] The composition of the ingot is: C 0.049%; Cr 14.69%; Ti 2.57%; Al 1.7%; Mo 3.06%; Ni balance; Nb 2.06%; Fe0.46%; Mn0.02%; Si0.06%; .001%; ​​P0.006%; Mg≤0.008%; Zr0.033%; B0.003%.

[0057] The GH4698 superalloy ingot billet forging equipment is a 45MN fast forging machine, the forging temperature is 1170±10°C, and it is heated by a natural gas furnace...

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Abstract

The invention relates to a preparation method of a GH4698 high-temperature alloy mold, and belongs to the technical field of alloy materials. The preparation method of the GH4698 high-temperature alloy mold comprises the following steps: heating a cast ingot to the temperature of 1160-1180 DEG C for first forging, wherein the total deformation in the forging process is below 20%; heating the castingot to the temperature of 1160-1180 DEG C for second forging, wherein the total deformation in the forging process is below 25%; heating the cast ingot to the temperature of 1160-1180 DEG C for third forging, wherein the total deformation in the forging process is below 35%; peeling the cast ingot after third forging to obtain a bar; carrying out three-time upsetting on the obtained bar at the temperature of 1140-1160 DEG C to finish module manufacturing, wherein the upsetting deformation of the bar is not higher than 40% during three-time upsetting; after upsetting is completed, rounding the bar to eliminate bulging influence; and carrying out heat treatment and finish machining to obtain the GH4698 high-temperature alloy mold. By the mold prepared by the method, the cost is greatly reduced.

Description

technical field [0001] The invention relates to a method for preparing a GH4698 superalloy mold, belonging to the technical field of alloy materials. Background technique [0002] Commonly used rotating parts of aero-engines are high-temperature alloys such as GH4169. These rotating parts are usually in the form of die forgings. From the perspective of cost, the mold generally chooses hot-work die steel 5CrNiMo, and the operating temperature is 300 ° C. ℃, at this time, it will cause tempering softening, the wear of the mold will be intensified, the service life will be reduced, and the dimensional accuracy of the cavity will be deteriorated, which cannot meet the long service life requirements. The GH4698 superalloy die can be used to forge the common rotating parts of the GH4169 aero-engine, but the cost of the GH4698 superalloy die made of the traditional GH4698 superalloy forging rod is extremely high, and the economy has no advantages. [0003] In view of the above sit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C19/05C22F1/10
CPCC22C19/056C22F1/10
Inventor 张鹏周文武王周田刘洋常玥莹
Owner 中国第二重型机械集团德阳万航模锻有限责任公司
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