CN117488034A - Heat treatment method for manufacturing low alloy steel/duplex stainless steel structural member by additive - Google Patents
Heat treatment method for manufacturing low alloy steel/duplex stainless steel structural member by additive Download PDFInfo
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- 229910000851 Alloy steel Inorganic materials 0.000 title claims abstract description 181
- 229910001039 duplex stainless steel Inorganic materials 0.000 title claims abstract description 115
- 238000010438 heat treatment Methods 0.000 title claims abstract description 80
- 238000000034 method Methods 0.000 title claims abstract description 65
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 62
- 239000000654 additive Substances 0.000 title claims abstract description 39
- 230000000996 additive effect Effects 0.000 title claims abstract description 39
- 239000000758 substrate Substances 0.000 claims abstract description 59
- 238000001816 cooling Methods 0.000 claims abstract description 50
- 239000002131 composite material Substances 0.000 claims abstract description 23
- 238000004381 surface treatment Methods 0.000 claims abstract description 17
- 238000004321 preservation Methods 0.000 claims abstract description 13
- 238000010791 quenching Methods 0.000 claims abstract description 9
- 230000000171 quenching effect Effects 0.000 claims abstract description 9
- 238000003466 welding Methods 0.000 claims description 88
- 229910052751 metal Inorganic materials 0.000 claims description 18
- 239000002184 metal Substances 0.000 claims description 18
- 230000007704 transition Effects 0.000 claims description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 15
- 238000000151 deposition Methods 0.000 claims description 10
- 239000002994 raw material Substances 0.000 claims description 9
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 8
- 238000004140 cleaning Methods 0.000 claims description 8
- 239000002932 luster Substances 0.000 claims description 8
- 238000005498 polishing Methods 0.000 claims description 8
- 230000001681 protective effect Effects 0.000 claims description 8
- 238000005530 etching Methods 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 5
- 229910000859 α-Fe Inorganic materials 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 229910001566 austenite Inorganic materials 0.000 description 3
- 238000005266 casting Methods 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000008204 material by function Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229910001562 pearlite Inorganic materials 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
- 238000005382 thermal cycling Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
- B22F10/20—Direct sintering or melting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
- B22F10/60—Treatment of workpieces or articles after build-up
- B22F10/64—Treatment of workpieces or articles after build-up by thermal means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/04—Welding for other purposes than joining, e.g. built-up welding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y10/00—Processes of additive manufacturing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y40/00—Auxiliary operations or equipment, e.g. for material handling
- B33Y40/20—Post-treatment, e.g. curing, coating or polishing
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
-
- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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Abstract
The invention discloses a heat treatment method for manufacturing a low alloy steel/duplex stainless steel structural member by additive, which comprises the following steps of: step one: carrying out surface treatment on the low alloy steel substrate, and then sequentially adding low alloy steel and duplex stainless steel on the low alloy steel substrate to obtain a low alloy steel/duplex stainless steel structural member; step two: placing the low alloy steel/duplex stainless steel structural member obtained by additive manufacturing in the step one into a box-type resistance furnace for heating; step three: heating to a preset temperature, and then keeping the low alloy steel/duplex stainless steel structural member at a constant temperature; step four: and after the heat preservation is finished, taking out the test piece, quenching and rapidly cooling. The method improves the structural uniformity and mechanical properties of the low alloy steel/duplex stainless steel composite structure.
Description
Technical Field
The invention belongs to the technical field of material heat treatment, and particularly relates to a heat treatment method for manufacturing a low alloy steel/duplex stainless steel structural member by additive.
Background
Heterogeneous materials or gradient functional materials can have specific localized properties through varying spatial chemistry and microstructure. So as to adapt to various complex service environments. Wherein the bimetal composite structure is composed of two different metals, and combines the distinct characteristics (thermal, physical, mechanical) of dissimilar metals. The low alloy steel/duplex stainless steel bimetal composite structure not only has the excellent corrosion resistance of the duplex stainless steel, but also has the advantage of low cost of the low alloy steel. In practical application, the cost can be saved, and the waste is avoided. Compared with the traditional rolling, casting and other modes, the arc additive manufacturing technology can directly mold according to the three-dimensional data of the workpiece, and can realize the molding of parts with complex shapes. The arc additive manufacturing technology using wires as raw materials is high in efficiency and low in cost, and can manufacture various materials according to a certain sequence, so that the arc additive manufacturing technology is a key technology for manufacturing heterogeneous material structures.
However, the direct energy deposition approach of fabricating bi-metallic composite structures using wire arc additive results in strong microstructural anisotropy, residual stresses at the interface, and deformation. Due to the thermal cycling and complex heat build-up processes of additive manufacturing, the microstructure of the resulting structural member of the additive manufacturing is quite complex, and thus the microstructure and phase composition must be tailored to achieve the desired properties. The heat treatment is an effective way for controlling the microstructure and mechanical property of the bimetal composite structure, and the microstructure of the bimetal structure can be more uniform through the heat treatment, so that the mechanical property is obviously improved. In the prior art, the manufacturing process of the low alloy steel/duplex stainless steel composite structure has been studied, but the heat treatment method of the composite structure has been studied less, so that the further improvement of the structural uniformity and the mechanical property of the additive manufacturing low alloy steel/duplex stainless steel composite structure is challenging.
Disclosure of Invention
The invention aims to provide a heat treatment method for manufacturing a low alloy steel/duplex stainless steel structural member by additive, which improves the structural uniformity and mechanical properties of a low alloy steel/duplex stainless steel composite structure.
The technical scheme adopted by the invention is that the heat treatment method for manufacturing the low alloy steel/duplex stainless steel structural member by additive manufacturing is carried out according to the following steps:
step one: carrying out surface treatment on the low alloy steel substrate, and then sequentially adding low alloy steel and duplex stainless steel on the low alloy steel substrate to obtain a low alloy steel/duplex stainless steel structural member;
step two: placing the low alloy steel/duplex stainless steel structural member obtained by additive manufacturing in the step one into a box-type resistance furnace for heating;
step three: heating to a preset temperature, and then keeping the low alloy steel/duplex stainless steel structural member at a constant temperature;
step four: and after the heat preservation is finished, taking out the test piece, quenching and rapidly cooling.
The present invention is also characterized in that,
in the first step, the specific process of carrying out surface treatment on the low alloy steel substrate is as follows: polishing the low alloy steel substrate until the surface has metallic luster, then placing the low alloy steel substrate in an ultrasonic vibration instrument filled with absolute ethyl alcohol for cleaning, removing oil stains on the surface, and airing.
In the first step, the low alloy steel and the duplex stainless steel are sequentially added on the low alloy steel substrate to obtain the low alloy steel/duplex stainless steel structural member, and the specific method comprises the following steps: adopting a cold metal transition welding method, firstly manufacturing low alloy steel on a low alloy steel substrate by using ER50-6 welding wires, wherein the technological parameters are as follows: welding current: 170A-180A, welding voltage: 18.6V-19V, welding speed: 0.20 mm/min-0.25 mm/min, welding amplitude of 6mm-8mm, and protective gas: 80% Ar+ volume fraction and 20% CO 2 The sum of the volume percentages of the components is 100 percent; after the low alloy steel is manufactured, a cold metal transition method is continuously used, ER2209 welding wires are used as raw materials for additive manufacturing of the duplex stainless steel, and the technological parameters are welding current: 130A-140A, welding voltage: 20V-21V, welding speed: 0.23 mm/min-0.27 mm/min, welding amplitude of 6-8mm and shielding gas of 100% Ar; and sequentially depositing to obtain the low alloy steel/duplex stainless steel composite structure.
In the second step, the heating temperature is 1060-1140 ℃, the heating rate is set to be 200-300 ℃/min, and the heating rate is kept constant.
In the third step, the heat preservation time is 1h.
In the fourth step, the cooling mode is water cooling, the cooling rate is 300 ℃/min-400 ℃/min, and the water cooling is rapid cooling treatment of the low alloy steel/duplex stainless steel piece through an etching method.
The beneficial effects of the invention are as follows:
(1) The invention relates to a heat treatment method for regulating and controlling microstructure of a bimetal composite structure of low alloy steel/duplex stainless steel manufactured by additive and improving mechanical properties. And the low alloy steel/duplex stainless steel piece is heated to the solid solution temperature and then is insulated for 1h, and the test piece is heated more uniformly by the heat insulation for 1h. Immediately cooling to room temperature after heat preservation, and rapidly cooling the low alloy steel/duplex stainless steel piece by a water-cooling etching method to avoid precipitation of excessive austenite, sigma phase, carbide and other harmful secondary phases formed in the duplex stainless steel. The method improves the structural uniformity and mechanical properties of the low alloy steel/duplex stainless steel composite structure.
(2) The invention provides a heat treatment method for manufacturing a low alloy steel/duplex stainless steel bimetal composite structural member by additive. Compared with a test piece which is directly deposited and tempered at a high temperature (500-650 ℃ and kept for 2 hours), the shrinkage of the section is improved, the microstructure non-uniformity of the structure is improved, the mechanical property of the structure is improved, and the mechanical property is obviously optimized.
(3) Compared with the traditional rolling, casting and other modes, the additive manufacturing technology adopts a layer-by-layer stacking mode to manufacture the structural member, has excellent metallurgical bonding, low cost and high efficiency, and has wide application prospect in the field of manufacturing the low alloy steel/duplex stainless steel bimetal.
Drawings
FIG. 1 is a metallographic photograph of a low alloy steel/duplex stainless steel member interface after heat treatment at a heating temperature of 1100℃and a holding time of 1h in example 1;
FIG. 2 is a photograph showing a duplex stainless steel side of a low alloy steel/duplex stainless steel member after heat treatment at a heating temperature of 1100℃for a holding time of 1h in example 1;
FIG. 3 is a metallographic photograph of the low alloy steel side of the low alloy steel/duplex stainless steel member after heat treatment at 1100℃for 1 hour in example 1;
FIG. 4 is a graph showing tensile properties of low alloy steel/duplex stainless steel parts before and after heat treatment in example 1.
Detailed Description
The invention will be described in detail below with reference to the drawings and the detailed description.
The invention provides a heat treatment method for manufacturing a low alloy steel/duplex stainless steel structural member by additive, which comprises the following steps of:
step one: carrying out surface treatment on the low alloy steel substrate, and then sequentially adding low alloy steel and duplex stainless steel on the low alloy steel substrate to obtain a low alloy steel/duplex stainless steel structural member;
in the first step, the specific process of carrying out surface treatment on the low alloy steel substrate is as follows: polishing the low alloy steel substrate until the surface has metallic luster, then placing the low alloy steel substrate in an ultrasonic vibration instrument filled with absolute ethyl alcohol for cleaning, removing oil stains on the surface, and airing.
In the first step, the low alloy steel and the duplex stainless steel are sequentially added on the low alloy steel substrate to obtain the low alloy steel/duplex stainless steel structural member, and the specific method comprises the following steps: adopting a cold metal transition welding method, firstly manufacturing low alloy steel on a low alloy steel substrate by using ER50-6 welding wires, wherein the technological parameters are as follows: welding current: 170A-180A, welding voltage: 18.6V-19V, welding speed: 0.20 mm/min-0.25 mm/min, welding amplitude 6-8mm, and protective gas: 80% Ar+ volume fraction and 20% CO 2 The sum of the volume percentages of the components is 100 percent; after the low alloy steel is manufactured, a cold metal transition method is continuously used, ER2209 welding wires are used as raw materials for additive manufacturing of the duplex stainless steel, and the technological parameters are welding current: 130A-140A, welding voltage: 20V-21V, welding speed: 0.23 mm/min-0.27 mm/min, welding amplitude of 6-8mm and shielding gas of 100% Ar; and sequentially depositing to obtain the low alloy steel/duplex stainless steel composite structure.
Step two: placing the low alloy steel/duplex stainless steel structural member obtained by additive manufacturing in the step one into a box-type resistance furnace for heating;
in the second step, the heating temperature is 1060-1140 ℃, the heating rate is set to be 200-300 ℃/min, and the heating rate is kept constant.
Step three: after heating to a preset temperature, keeping the low alloy steel/duplex stainless steel structural member at a constant temperature for 1h;
step four: and after the heat preservation is finished, taking out the test piece, quenching and rapidly cooling.
In the fourth step, the cooling mode is water cooling, the cooling rate is 300 ℃/min-400 ℃/min, and the water cooling is rapid cooling treatment of the low alloy steel/duplex stainless steel piece through an etching method.
Example 1
A heat treatment method for additively manufacturing a low alloy steel/duplex stainless steel structural member comprises the following steps:
step one: carrying out surface treatment on the low alloy steel substrate, and then sequentially adding low alloy steel and duplex stainless steel on the low alloy steel substrate to obtain a low alloy steel/duplex stainless steel structural member;
in the first step, the specific process of carrying out surface treatment on the low alloy steel substrate is as follows: polishing the low alloy steel substrate until the surface has metallic luster, then placing the low alloy steel substrate in an ultrasonic vibration instrument filled with absolute ethyl alcohol for cleaning, removing oil stains on the surface, and airing.
In the first step, the first step is to perform,the specific method for sequentially adding the low alloy steel and the duplex stainless steel on the low alloy steel substrate to obtain the low alloy steel/duplex stainless steel structural member comprises the following steps of: adopting a cold metal transition welding method, firstly manufacturing low alloy steel on a low alloy steel substrate by using ER50-6 welding wires, wherein the technological parameters are as follows: welding current: 170A-180A, welding voltage: 18.6V-19V, welding speed: 0.20 mm/min-0.25 mm/min, welding amplitude of 6mm-8mm, and protective gas: 80% Ar+ volume fraction and 20% CO 2 The sum of the volume percentages of the components is 100 percent; after the low alloy steel is manufactured, a cold metal transition method is continuously used, ER2209 welding wires are used as raw materials for additive manufacturing of the duplex stainless steel, and the technological parameters are welding current: 130A-140A, welding voltage: 20V-21V, welding speed of 0.23 mm/min-0.27 mm/min, welding amplitude of 6-8mm and shielding gas of 100% Ar; and sequentially depositing to obtain the low alloy steel/duplex stainless steel composite structure.
Step two: placing the low alloy steel/duplex stainless steel structural member obtained by additive manufacturing in the step one into a box-type resistance furnace for heating;
in the second step, the heating temperature is 1100 ℃, the heating rate is set to 300 ℃/min, and the heating rate is kept constant.
Step three: after heating to a preset temperature, keeping the low alloy steel/duplex stainless steel structural member at a constant temperature for 1h;
step four: and after the heat preservation is finished, taking out the test piece, quenching and rapidly cooling.
In the fourth step, the cooling mode is water cooling, the cooling rate is 400 ℃/min, and the water cooling is rapid cooling treatment of the low alloy steel/duplex stainless steel piece through an etching method.
As can be seen from fig. 1, there is a distinct interface for additive manufacturing of the bimetallic composite structure;
as can be seen from fig. 2, after heat treatment, the duplex stainless steel has a ferrite and austenite duplex structure on one side and is more uniformly distributed, and the ratio of the two phases is close to 1:1;
as can be seen from fig. 3, the structure of the low alloy steel after one side heat treatment is composed of sideboard strip ferrite and acicular ferrite, the crystal structure is characterized by columnar crystals, and the grain size is uniform;
and compared with the deposition state and tempering treatment (heating temperature 500-650 ℃ and heat preservation 2 h), the test piece with the heating temperature of 1100 ℃ and the heat preservation time of 1h is selected, and fine strip austenite is obtained on one side of the duplex stainless steel and is uniformly distributed on a ferrite matrix, so that the microstructure is more uniform. A series of microstructures including ferrite, pearlite, etc. can be formed after heat treatment on the low alloy steel side, and very high strength and hardness are provided on the low carbon steel side. The fracture is transferred from the low alloy steel side to the duplex stainless steel side through heat treatment, so that the tensile strength and the fracture elongation are improved, and the mechanical properties are optimized. As can be seen from FIG. 4, after heat treatment, the yield strength was about 500MP, the tensile strength was about 720MPa, and the yield strength and the tensile strength were increased by 32% and 39%, respectively, as compared with the as-deposited sample. The mechanical properties of the composite structure are obviously improved by heat treatment. The method improves the structural uniformity and mechanical properties of the low alloy steel/duplex stainless steel composite structure.
Example 2
A heat treatment method for additively manufacturing a low alloy steel/duplex stainless steel structural member comprises the following steps:
step one: carrying out surface treatment on the low alloy steel substrate, and then sequentially adding low alloy steel and duplex stainless steel on the low alloy steel substrate to obtain a low alloy steel/duplex stainless steel structural member;
in the first step, the specific process of carrying out surface treatment on the low alloy steel substrate is as follows: polishing the low alloy steel substrate until the surface has metallic luster, then placing the low alloy steel substrate in an ultrasonic vibration instrument filled with absolute ethyl alcohol for cleaning, removing oil stains on the surface, and airing.
In the first step, the low alloy steel and the duplex stainless steel are sequentially added on the low alloy steel substrate to obtain the low alloy steel/duplex stainless steel structural member, and the specific method comprises the following steps: adopting a cold metal transition welding method, firstly manufacturing low alloy steel on a low alloy steel substrate by using ER50-6 welding wires, wherein the technological parameters are as follows: welding current: 170A-180A, welding voltage: 18.6V-19V, welding speed: 0.20 mm/min-0.25 mm/min, and welding amplitude of 6mm-8mmThe protective gas is as follows: 80% Ar+ volume fraction and 20% CO 2 The sum of the volume percentages of the components is 100 percent; after the low alloy steel is manufactured, a cold metal transition method is continuously used, ER2209 welding wires are used as raw materials for additive manufacturing of the duplex stainless steel, and the technological parameters are welding current: 130A-140A, welding voltage: 20V-21V, welding speed of 0.23 mm/min-0.27 mm/min, welding amplitude of 6-8mm and shielding gas of 100% Ar; and sequentially depositing to obtain the low alloy steel/duplex stainless steel composite structure.
Step two: placing the low alloy steel/duplex stainless steel structural member obtained by additive manufacturing in the step one into a box-type resistance furnace for heating;
in the second step, the heating temperature is 1060 ℃, the heating rate is set to 300 ℃/min, and the heating rate is kept constant.
Step three: after heating to a preset temperature, keeping the low alloy steel/duplex stainless steel structural member at a constant temperature for 1h;
step four: and after the heat preservation is finished, taking out the test piece, quenching and rapidly cooling.
In the fourth step, the cooling mode is water cooling, the cooling rate is 400 ℃/min, and the water cooling is rapid cooling treatment of the low alloy steel/duplex stainless steel piece through an etching method.
Example 3
The heat treatment method for manufacturing the low alloy steel/duplex stainless steel structural member by additive manufacturing comprises the following steps:
step one: carrying out surface treatment on the low alloy steel substrate, and then sequentially adding low alloy steel and duplex stainless steel on the low alloy steel substrate to obtain a low alloy steel/duplex stainless steel structural member;
in the first step, the specific process of carrying out surface treatment on the low alloy steel substrate is as follows: polishing the low alloy steel substrate until the surface has metallic luster, then placing the low alloy steel substrate in an ultrasonic vibration instrument filled with absolute ethyl alcohol for cleaning, removing oil stains on the surface, and airing.
In the first step, the low alloy steel and the duplex stainless steel are sequentially added on the low alloy steel substrate to obtain the low alloy steel/duplex stainless steel structural member, and the specific method comprises the following steps: by usingThe cold metal transition welding method includes that ER50-6 welding wires are firstly used for manufacturing low alloy steel on a low alloy steel substrate, and the technological parameters are as follows: welding current: 170A-180A, welding voltage: 18.6V-19V, welding speed: 0.20 mm/min-0.25 mm/min, welding amplitude of 6mm-8mm, and protective gas: 80% Ar+ volume fraction and 20% CO 2 The sum of the volume percentages of the components is 100 percent; after the low alloy steel is manufactured, a cold metal transition method is continuously used, ER2209 welding wires are used as raw materials for additive manufacturing of the duplex stainless steel, and the technological parameters are welding current: 130A-140A, welding voltage: 20V-21V, welding speed of 0.23 mm/min-0.27 mm/min, welding amplitude of 6-8mm and shielding gas of 100% Ar; and sequentially depositing to obtain the low alloy steel/duplex stainless steel composite structure.
Step two: placing the low alloy steel/duplex stainless steel structural member obtained by additive manufacturing in the step one into a box-type resistance furnace for heating;
in the second step, the heating temperature is 1140 ℃, the heating rate is set to 300 ℃/min, and the heating rate is kept constant.
Step three: after heating to a preset temperature, keeping the low alloy steel/duplex stainless steel structural member at a constant temperature for 1h;
step four: and after the heat preservation is finished, taking out the test piece, quenching and rapidly cooling.
In the fourth step, the cooling mode is water cooling, the cooling rate is 400 ℃/min, and the water cooling is rapid cooling treatment of the low alloy steel/duplex stainless steel piece through an etching method.
Example 4
The heat treatment method for manufacturing the low alloy steel/duplex stainless steel structural member by additive manufacturing comprises the following steps:
step one: carrying out surface treatment on the low alloy steel substrate, and then sequentially adding low alloy steel and duplex stainless steel on the low alloy steel substrate to obtain a low alloy steel/duplex stainless steel structural member;
in the first step, the specific process of carrying out surface treatment on the low alloy steel substrate is as follows: polishing the low alloy steel substrate until the surface has metallic luster, then placing the low alloy steel substrate in an ultrasonic vibration instrument filled with absolute ethyl alcohol for cleaning, removing oil stains on the surface, and airing.
In the first step, the low alloy steel and the duplex stainless steel are sequentially added on the low alloy steel substrate to obtain the low alloy steel/duplex stainless steel structural member, and the specific method comprises the following steps: adopting a cold metal transition welding method, firstly manufacturing low alloy steel on a low alloy steel substrate by using ER50-6 welding wires, wherein the technological parameters are as follows: welding current: 170A-180A, welding voltage: 18.6V-19V, welding speed: 0.20 mm/min-0.25 mm/min, welding amplitude of 6mm-8mm, and protective gas: 80% Ar+ volume fraction and 20% CO 2 The sum of the volume percentages of the components is 100 percent; after the low alloy steel is manufactured, a cold metal transition method is continuously used, ER2209 welding wires are used as raw materials for additive manufacturing of the duplex stainless steel, and the technological parameters are welding current: 130A-140A, welding voltage: 20V-21V, welding speed of 0.23 mm/min-0.27 mm/min, welding amplitude of 6-8mm and shielding gas of 100% Ar; and sequentially depositing to obtain the low alloy steel/duplex stainless steel composite structure.
Step two: placing the low alloy steel/duplex stainless steel structural member obtained by additive manufacturing in the step one into a box-type resistance furnace for heating;
in the second step, the heating temperature is 1080 ℃, the heating rate is set to 260 ℃/min, and the heating rate is kept constant.
Step three: after heating to a preset temperature, keeping the low alloy steel/duplex stainless steel structural member at a constant temperature for 1h;
step four: and after the heat preservation is finished, taking out the test piece, quenching and rapidly cooling.
In the fourth step, the cooling mode is water cooling, the cooling rate is 350 ℃/min, and the water cooling is rapid cooling treatment of the low alloy steel/duplex stainless steel piece through an etching method.
Example 5
The heat treatment method for manufacturing the low alloy steel/duplex stainless steel structural member by additive manufacturing comprises the following steps:
step one: carrying out surface treatment on the low alloy steel substrate, and then sequentially adding low alloy steel and duplex stainless steel on the low alloy steel substrate to obtain a low alloy steel/duplex stainless steel structural member;
in the first step, the specific process of carrying out surface treatment on the low alloy steel substrate is as follows: polishing the low alloy steel substrate until the surface has metallic luster, then placing the low alloy steel substrate in an ultrasonic vibration instrument filled with absolute ethyl alcohol for cleaning, removing oil stains on the surface, and airing.
In the first step, the low alloy steel and the duplex stainless steel are sequentially added on the low alloy steel substrate to obtain the low alloy steel/duplex stainless steel structural member, and the specific method comprises the following steps: adopting a cold metal transition welding method, firstly manufacturing low alloy steel on a low alloy steel substrate by using ER50-6 welding wires, wherein the technological parameters are as follows: welding current: 170A-180A, welding voltage: 18.6V-19V, welding speed: 0.20 mm/min-0.25 mm/min, welding amplitude of 6mm-8mm, and protective gas: 80% Ar+ volume fraction and 20% CO 2 The sum of the volume percentages of the components is 100 percent; after the low alloy steel is manufactured, a cold metal transition method is continuously used, ER2209 welding wires are used as raw materials for additive manufacturing of the duplex stainless steel, and the technological parameters are welding current: 130A-140A, welding voltage: 20V-21V, welding speed of 0.23 mm/min-0.27 mm/min, welding amplitude of 6-8mm and shielding gas of 100% Ar; and sequentially depositing to obtain the low alloy steel/duplex stainless steel composite structure.
Step two: placing the low alloy steel/duplex stainless steel structural member obtained by additive manufacturing in the step one into a box-type resistance furnace for heating;
in the second step, the heating temperature is 1120 ℃, the heating rate is set to be 200 ℃/min, and the heating rate is kept constant.
Step three: after heating to a preset temperature, keeping the low alloy steel/duplex stainless steel structural member at a constant temperature for 1h;
step four: and after the heat preservation is finished, taking out the test piece, quenching and rapidly cooling.
In the fourth step, the cooling mode is water cooling, the cooling rate is 300 ℃/min, and the water cooling is rapid cooling treatment of the low alloy steel/duplex stainless steel piece through an etching method.
The low alloy steel substrate of examples 1-5 may be selected from q345.
Claims (6)
1. The heat treatment method for additively manufacturing the low alloy steel/duplex stainless steel structural member is characterized by comprising the following steps of:
step one: carrying out surface treatment on the low alloy steel substrate, and then sequentially adding low alloy steel and duplex stainless steel on the low alloy steel substrate to obtain a low alloy steel/duplex stainless steel structural member;
step two: placing the low alloy steel/duplex stainless steel structural member obtained by additive manufacturing in the step one into a box-type resistance furnace for heating;
step three: heating to a preset temperature, and then keeping the low alloy steel/duplex stainless steel structural member at a constant temperature;
step four: and after the heat preservation is finished, taking out the test piece, quenching and rapidly cooling.
2. The heat treatment method for manufacturing a low alloy steel/duplex stainless steel structure according to claim 1, wherein in the first step, the specific process of surface treatment of the low alloy steel substrate is: polishing the low alloy steel substrate until the surface has metallic luster, then placing the low alloy steel substrate in an ultrasonic vibration instrument filled with absolute ethyl alcohol for cleaning, removing oil stains on the surface, and airing.
3. The heat treatment method for manufacturing a low alloy steel/duplex stainless steel structural member according to claim 2, wherein in the first step, the specific method for sequentially adding the low alloy steel and the duplex stainless steel on the low alloy steel substrate to obtain the low alloy steel/duplex stainless steel structural member is as follows: adopting a cold metal transition welding method, firstly manufacturing low alloy steel on a low alloy steel substrate by using ER50-6 welding wires, wherein the technological parameters are as follows: welding current: 170A-180A, welding voltage: 18.6V-19V, welding speed: 0.20 mm/min-0.25 mm/min, welding amplitude of 6mm-8mm, and protective gas: 80% Ar+ volume fraction and 20% CO 2 The sum of the volume percentages of the components is 100 percent; after the low alloy steel is manufactured, continuously using a cold metal transition method, and using ER2209 welding wires as raw materials to manufacture duplex stainless steel in an additive manner, and processingThe parameters are welding current: 130A-140A, welding voltage: 20V-21V, welding speed: 0.23 mm/min-0.27 mm/min, welding amplitude of 6-8mm and shielding gas of 100% Ar; and sequentially depositing to obtain the low alloy steel/duplex stainless steel composite structure.
4. The heat treatment method for manufacturing a low alloy steel/duplex stainless steel structural member by additive manufacturing according to claim 1, wherein in the second step, the heating temperature is 1060-1140 ℃, the heating rate is set to be 200-300 ℃/min, and the heating rate is kept constant.
5. The heat treatment method for manufacturing a low alloy steel/duplex stainless steel structure according to claim 1, wherein in the third step, the holding time is 1h.
6. The heat treatment method for manufacturing a low alloy steel/duplex stainless steel structural member according to claim 1, wherein in the fourth step, the cooling mode is water cooling, and the cooling rate is 300 ℃/min to 400 ℃/min.
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