CN115945616A - Forming method for austenite-containing material alloy forging with internal structure meeting physicochemical test - Google Patents
Forming method for austenite-containing material alloy forging with internal structure meeting physicochemical test Download PDFInfo
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- CN115945616A CN115945616A CN202211608768.8A CN202211608768A CN115945616A CN 115945616 A CN115945616 A CN 115945616A CN 202211608768 A CN202211608768 A CN 202211608768A CN 115945616 A CN115945616 A CN 115945616A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
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Abstract
The invention belongs to the field of cold forging, and relates to a forming method for an austenite-containing alloy forging with an internal structure meeting physicochemical tests. The method comprises the following steps: actually measuring the yield strength of the formed and heat-treated forged piece; if the actually measured yield strength is unqualified, performing cold forging on the forging; and placing at normal temperature to obtain the qualified forged piece.
Description
Technical Field
The invention belongs to the field of cold forging, and relates to a forming method for an austenite-containing alloy forging with an internal structure meeting physicochemical tests.
Background
1Cr18Ni9Ti is a titanium-containing austenitic stainless steel material, wherein the alloy elements are C, si, mn, P, S, cr, ni and Ti. According to the standard GJB 2294-95; the final mechanical property index of the forge piece in actual production individually exceeds the standard; the high-temperature alloy has great influence on the final mechanical property requirement of a forged piece, causes unqualified physical and chemical properties of the forged piece, has high tensile and lasting creep strength and good oxidation resistance within the range of 650-750 ℃, and is used for manufacturing high-temperature parts of aviation and aerospace engines which require high strength below 750 ℃ and corrosion resistance below 750 ℃. Due to the corrosion resistance, the stainless steel is widely applied to the fields of aviation, aerospace and the like, and is one of the most widely used stainless steel materials on the current foreign aeroengines.
The 1Cr18Ni9Ti alloy forge piece has high requirements on the performance of the forge piece and the forging process and heat treatment, particularly, the heat treatment system of a forging production coolant influences different production parameter control requirements on the forge piece, if the production parameter is not controlled in place, the change of each parameter directly influences the internal structure of the forge piece, so that the product cannot meet the final required requirements, and the product is scrapped to generate great resource waste.
The 1Cr18Ni9Ti steel is generally applied to a bearing part or a rotating part which rotates at a high speed in aviation, and has high requirements on the tensile property and the impact property of a forged piece in use.
The conventional forging method comprises the following steps:
blanking, forming, heat treatment, physical and chemical, after the common forging is finished by the conventional method, the physical and chemical detection of the forged piece sometimes has unqualified performance indexes, and the research on the unqualified performance indexes which exceed the standard is less. This results in the forging being scrapped.
Disclosure of Invention
The purpose of the invention is: according to the condition that the performance of the 1Cr18Ni9Ti material forged piece is unqualified, different 1Cr18Ni9Ti cold forging methods are provided, the internal structure of the forged piece is improved by controlling the cold forging method, the forging method is used for meeting the forging forming scheme with reasonable design requirements of the forged piece, and the qualified and stable internal structure and mechanical performance indexes are obtained.
The technical scheme is as follows:
a forming method for meeting physicochemical test of internal tissues of an alloy forging containing austenite materials comprises the following steps:
actually measuring the yield strength of the formed and heat-treated forged piece;
if the actually measured yield strength is unqualified, performing cold forging on the forging;
and placing at normal temperature to obtain the qualified forged piece.
The cold forging of this forging includes:
and determining a corresponding classification forging method according to the actually measured yield strength, so as to select proper hammering times and hammering gaps.
The yield strength and the corresponding relation of the classified forging method are as follows:
the actual measurement of the yield strength is within the range of 509MPa-508MPa, and the cold forging is corresponding to the same type;
the actual measurement of the yield strength is in the range of 507MPa-506MPa and corresponds to the second type of cold forging;
the actual measurement of the yield strength is in the range of 505MPa-504MPa, and the three types of cold forging are corresponding;
the actual measurement of the yield strength is in the range of 503MPa-501MPa, which corresponds to four types of cold forging.
The corresponding relation between the classified forging method and the hammering times is as follows:
cold forging: hammering times is 1-2 times; and (2) cold forging: hammering times is 2-3; three types of cold forging: hammering times is 3-4; four types of cold forging: hammering times 4-5 times.
The corresponding relation between the classification forging method and the hammering clearance is as follows:
cold forging: no hammering gap exists; and II, cold forging: 1-2 seconds; three types of cold forging: 2-3 seconds four types of cold forging: 3-4 seconds.
The cold forging is carried out at room temperature.
The standing time at normal temperature is 2 hours.
The beneficial effects of the invention are:
the 1Cr18Ni9Ti steel belongs to martensite-ferrite stainless steel, different 1Cr18Ni9Ti forging methods are provided through measuring the content of the Al element of the raw material, the internal structure of a forging is improved, a forging forming scheme with reasonable design requirements of the forging is met through a cold forging method, the qualified and stable internal structure is obtained, the qualification rate of the internal structure of the forging in physical and chemical measurement is improved, the waste loss is reduced, and the qualification rate of the forging is greatly improved.
Detailed Description
The method is characterized in that the condition that the mechanical property of the 1Cr18Ni9Ti material forge piece is unqualified is measured to provide different 1Cr18Ni9Ti cold forging methods, and the actual measured content range of the general 1Cr18Ni9Ti forge piece technical indexes which are more than or equal to 510MPa according to the requirement of GJB5040-2001 yield strength is as follows:
the internal structure of the forge piece is improved by controlling the forging method, and the forging method is used for meeting the forging forming scheme with reasonable design requirements of the forge piece, so that the qualified and stable internal structure is obtained. During cold forging, the internal structure of the forging piece at normal temperature is forged to be properly improved, so that the internal structure of the forging piece required is obtained to meet the requirement of the final mechanical property of the forging piece.
The method comprises the following steps:
step one, performing cold forging on the formed and heat-treated steel, grading according to the technical condition standard of the forged piece and the actual unqualified measurement value of the yield strength, determining a cold forging method,
step two, classifying forging methods; forging in first class, second class, third class and fourth class;
the actual measurement of the yield strength is within the range of 509MPa-508MPa, and the cold forging is corresponding to the same type; hammering times 1-2;
the actual measurement of the yield strength is in the range of 507MPa-506MPa and corresponds to the second type of cold forging; the number of hammering is 2-3;
the actual measurement of the yield strength is in the range of 505MPa-504MPa, and the three types of cold forging are corresponding; the number of hammering is 3-4;
the actual measurement of the yield strength is in the range of 503MPa-501MPa and corresponds to four types of cold forging; the number of hammering is 4-5;
step three, cold forging method
A classified forging method; forging in first class, second class, third class and fourth class;
cold forging; hammering times is 1-2 times; there is no gap between hammering
Cold forging; hammering times is 2-3 times; hammering after 1-2 seconds of clearance
Performing three types of cold forging; hammering times is 3-4 times; hammering after the interval of 2-3 seconds
Four types of cold forging; hammering times is 4-5 times; hammering after 3-4 seconds of clearance
Step four, a forging post-treatment method: the sample can be placed for 2 hours at normal temperature without secondary heat treatment, and then physicochemical detection is carried out.
And step five, performing mechanical property inspection by 100%.
Example (b):
(1) An engine model 'Sibe' ring piece X2504168 forging made of 1Cr18Ni9Ti; the category: II, forging size: Φ 944 × Φ 845 × 118
(2) The process flow comprises the following steps: blanking → forging, inner hole of vehicle → broaching of horse frame, flat end face → broaching → heat treatment → physicochemical → rough vehicle → flaw detection → acid cleaning → grinding → final inspection → warehousing.
(3) The number of the production furnace is Mo 1541413D/1541713D-2; quantity: 10.5 the determination of the yield strength of the forged steel piece after physical and chemical tests and determination after forging, turning an inner hole, expanding a hole on a trestle, flattening an end face, expanding the hole and carrying out heat treatment is as follows: 508MPa;507MPa; judging the type II according to the scheme, and performing cold deformation repair;
(4) Selecting equipment on a 3t free forging hammer, wherein the hammering times are set to be 2 hammers; the clearance time is 2 seconds, and physical and chemical tests are directly carried out after forging (the forging and the physical and chemical parts are carried out simultaneously)
(5) The physical and chemical tests are as follows:
the mechanical properties of the manager detection are qualified.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive various equivalent modifications or substitutions within the technical scope of the present invention, and these modifications or substitutions should be covered within the scope of the present invention.
Claims (8)
1. A forming method for enabling internal tissues of an alloy forging containing austenite materials to meet physicochemical tests is characterized by comprising the following steps of:
actually measuring the yield strength of the formed and heat-treated forged piece;
if the actually measured yield strength is unqualified, performing cold forging on the forging;
and placing at normal temperature to obtain the qualified forged piece.
2. The method of claim 1, wherein cold forging the forging comprises:
and determining a corresponding classification forging method according to the actually measured yield strength, so as to select proper hammering times and hammering gaps.
3. The method of claim 2, wherein the yield strength and the classification forging method correspond to:
the actual measurement of the yield strength is within the range of 509MPa-508MPa, and the cold forging is corresponding to the same type;
the actual measurement of the yield strength is in the range of 507MPa-506MPa and corresponds to the second type of cold forging;
the actual measurement of the yield strength is in the range of 505MPa-504MPa, and the three types of cold forging are corresponding;
the actual measurement of the yield strength is in the range of 503MPa-501MPa, which corresponds to four types of cold forging.
4. The method according to claim 3, wherein the correspondence between the classification forging method and the number of hammering times is:
cold forging: hammering times is 1-2; and II, cold forging: hammering times is 2-3 times; three types of cold forging: hammering times is 3-4 times; four types of cold forging: hammering times 4-5 times.
5. The method of claim 4, wherein the correspondence between the classified forging method and the hammering gap is:
cold forging: no hammering gap exists; and II, cold forging: 1-2 seconds; three types of cold forging: 2-3 seconds four types of cold forging: 3-4 seconds.
6. The method of claim 5, wherein the cold forging is performed at room temperature.
7. The method of claim 1, wherein the standing time at room temperature is 2 hours.
8. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the method according to any one of claims 1 to 7.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211608768.8A CN115945616A (en) | 2022-12-14 | 2022-12-14 | Forming method for austenite-containing material alloy forging with internal structure meeting physicochemical test |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211608768.8A CN115945616A (en) | 2022-12-14 | 2022-12-14 | Forming method for austenite-containing material alloy forging with internal structure meeting physicochemical test |
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| CN115945616A true CN115945616A (en) | 2023-04-11 |
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