Heat treatment process for recovering endurance property of notch of welding assembly of GH4169 alloy forge piece
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A technology of GH4169 and welding components, which is applied in the field of heat treatment, can solve the problems of persistent notch sensitivity, less δ phase content, notch sensitivity, etc., and achieve the effect of eliminating notch sensitivity and improving the manufacturing qualification rate
Inactive Publication Date: 2019-02-15
SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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After analysis, the main reason is that after the vacuum brazing of the test piece, the δ phase content in the sample structure is less, and there is almost no δ phase precipitation on the grain boundary, which causes the notch to be permanently sensitive.
[0003] Aiming at the problem that the current GH4169 alloy welded components are notch sensitive after brazing and aging treatment, the present invention provides an intermediate heat treatment and aging process for restoring the δ phase, which can eliminate the notch sensitivity of GH4169 alloy forgings and restore the GH4169 alloy welded components Notch Persistence Performance
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Embodiment 1
[0018] Taking GH4169 alloy forging as an example to specifically illustrate the implementation process of the present invention.
[0019] 1) Intermediate heat treatment
[0020] Put the notch-sensitive GH4169 alloy welded assembly into an air furnace, heat it to 950°C, keep it warm for 2h, and cool it to room temperature within 0.5h.
[0021] 2) aging treatment
[0022] Put the GH4169 alloy welding assembly that has undergone intermediate heat treatment into an air furnace, heat it to 700°C, keep it for 8h, cool it to 600°C at a rate of 50±10°C / h, keep it for 8h, and air cool.
[0023] Alloy structure before and after heat treatment figure 1 , 2 It can be seen from the figure that the notch sensitivity of the GH4169 alloy welded assembly can be eliminated by using this method.
Embodiment 2
[0025] 1) Intermediate heat treatment
[0026] Put the notch-sensitive GH4169 alloy welding assembly into an air furnace, heat it to 980°C, keep it warm for 0.5h, and cool it to room temperature within 0.5h.
[0027] 2) aging treatment
[0028] Put the GH4169 alloy welded assembly that has undergone intermediate heat treatment into an air furnace, heat it to 800°C, keep it for 8h, cool it to 700°C at a rate of 50±10°C / h, keep it for 8h, and air cool.
[0029] Using this method eliminates the notch sensitivity of the GH4169 alloy welded assembly.
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Abstract
For solving the problem that notch sensitivity exists after an existing GH4169 alloy welding assembly is subjected to braze welding and aging treatment, the invention provides an intermediate heat treatment and aging process using a recovery delta phase, namely a process of intermediate heat treatment and aging. The specific intermediate heat treatment technological process comprises the steps ofplacing a GH4169 alloy welding assembly with notch sensitivity in an air furnace, heating to the temperature of 950-980 DEG C, insulating for 0.5-2 h, and cooling to the room temperature within 0.5 h.The aging technological process comprises the steps of placing the GH4169 alloy welding assembly subjected to intermediate heat treatment into the air furnace, heating to the temperature of 700-800 DEG C, insulating for 8 h, cooling to the temperature of 600-700 DEG C at the rate of 50+/- 10 DEG C/h, insulating for 8 h and cooling in air. The notch sensitivity of the GH4169 alloy forge piece canbe eliminated, and the endurance property of the notch of the GH4169 alloy welding assembly is recovered.
Description
technical field [0001] The invention belongs to the field of heat treatment, and in particular provides a heat treatment process for restoring the notch durability of welded components of GH4169 alloy forgings. Background technique [0002] GH4169 alloy is widely used in my country, especially in the aviation industry, such as drum shafts and turbine disks made of GH4169 alloy. At present, there is no special acceptance technical condition for post-brazing heat treatment of GH4169 alloy forgings in China. Considering the processing and performance of materials, aging heat treatment is usually arranged on components after brazing, and the basis for the preparation of component heat treatment systems comes from material standards. . After the solution treatment of GH4169 alloy forgings, according to the existing vacuum brazing process, when the mechanical properties were checked after aging treatment, it was found that some forgings had notches and the durability performance ...
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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/10
CPCC22F1/10
Inventor 佗劲红王丹邰清安张凡云赵兴东
Owner SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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