Previous particle boundary precipitation preventable high-temperature alloy powder hot isostatic pressing process
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A high-temperature alloy and original particle technology, which is applied in the field of static pressure process and powder metallurgy superalloy components, can solve the problems of increasing the manufacturing cost of powder superalloy, achieve the effect of improving utilization rate, reducing manufacturing cost and shortening the manufacturing process
Inactive Publication Date: 2014-02-05
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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[0007] There is no doubt that these methods have in
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Embodiment 1
[0036] The composition of the alloy is shown in Table 1:
[0037] Table 1. Alloy composition of GH4169G
[0038] Cr
Mo
Al
Ti
Nb
C
B
P
Ni
Fe
19.3
2.98
0.5
1.04
4.94
0.031
0.008
0.023
53.5
margin
[0039] In this embodiment, argon gas atomization is used to prepare the powder of the alloy, and the powder with a size below 105 microns is packed into a stainless steel sheath, and hot isostatic pressing is performed after vacuum degassing. The following process system (A) was selected for this alloy:
[0040] In the first stage, the temperature and pressure are increased with the furnace, 1245 ° C / 150 MPa / 0.5 hours, and cooled with the furnace after completion;
[0041] The second stage heat preservation process, 1110°C / 150MPa / 4 hours, cool to room temperature with the furnace.
[0042] The hot isostatic pressing temperature of the first stage of the system is higher than the Laves p...
Embodiment 2
[0047] The difference from Example 1 is that the temperature in the first stage of this embodiment is above the solidus line of the alloy, and more liquid phases will be formed during the hot isostatic pressing process, so the temperature in the second stage increases accordingly, so that Ensure that the Laves phase formed after cooling in the first stage can be fully eliminated.
[0048] In this embodiment, argon gas atomization is used to prepare the powder of the alloy, and the powder with a size below 105 microns is packed into a stainless steel sheath, and hot isostatic pressing is performed after vacuum degassing. The following process system (B) was selected for this alloy:
[0049] In the first stage, the temperature and pressure are increased with the furnace, 1265 ° C / 150 MPa / 0.5 hours, and cooled with the furnace after completion;
[0050] The second stage of heat preservation process, 1140 ° C / 150 MPa / 4 hours, cooled to room temperature with the furnace. ...
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Abstract
The invention belongs to the field of powder metallurgy high-temperature alloy field, particularly relates to a previous particle boundary precipitation preventable high-temperature alloy powder hot isostatic pressing process and is applicable to preparation of powder metallurgy high-temperature alloy members formed through hot isostatic pressing directly. The process comprises that step one, the hot isostatic pressing temperature is higher than the initial melting temperature of low-melting-point phases of alloy powder and lower than 15 DEG C above the solidus of complete homogenization of alloy, the gas pressure is larger than or equal to 90 MPa, and time is longer than or equal to 20 minutes and shorter than or equal to 2 hours; step two, heating is stopped to subject materials to furnace cooling till the temperature of the materials is below the initial melting temperature of the low-melting-point phases to perform thermal insulation for 2 hours or longer after the first step is completed, so that the low-melting-point phases formed during cooling after the first step can be dissolved completely; the alloy is subjected to pressure maintaining and cooling with furnace till the room temperature after the second step is completed. By means of the process, precipitated phase such as carbides can be prevented from precipitating out along the powder previous particle boundaries, and accordingly, the compact alloy with microscopic structures as equiaxed grains is obtained.
Description
technical field [0001] The invention belongs to the field of powder metallurgy superalloys, and specifically relates to a hot isostatic pressing process for superalloy powders that can avoid the precipitation of carbides and other precipitates along the boundaries of powder primary particles, and is suitable for preparing direct hot isostatic pressing powder metallurgy superalloy components . Background technique [0002] Superalloys are the most widely used materials in aero-engines. The mechanical properties and temperature-bearing capacity of superalloys greatly depend on the amount of strengthening elements added to the alloy. Too much addition of strengthening elements will increase the macro and micro segregation of the alloy, deteriorate the microstructure uniformity and hot workability, and even make it impossible to hot work. The preparation of alloy powder by rapid solidification technology can effectively inhibit the segregation of elements formed during the soli...
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