Non-magnetic steel-low carbon steel bimetallic composite component and preparation method

Abstract

The application discloses a preparation method of a non-magnetic steel-low-carbon steel bimetallic composite component, and particularly relates to the following steps: step 1, preparing a wire for the non-magnetic steel-low-carbon steel bimetallic composite component; step 2, modeling the non-magnetic steel-low-carbon steel bimetallic composite component, determining an additive manufacturing path, and performing slice processing on the overall modeling; step 3, loading the ER50-6 welding wire into an additive manufacturing system to perform additive manufacturing on the low-carbon steel side; step 4, loading the wire prepared in step 1 into the additive manufacturing system to perform additive manufacturing on the non-magnetic steel side; and step 5, optimizing the surface roughness by mechanical cutting, and strengthening the interface and removing the residual stress on the surface by laser impact after the optimization. The method can solve the problem of magnetization on the non-magnetic steel side of the non-magnetic steel-low-carbon steel composite component, and can effectively reduce the residual stress on the interface. The application also discloses a non-magnetic steel-low-carbon steel bimetallic composite component.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of metal materials, and particularly relates to a non-magnetic steel-low-carbon steel bimetallic composite component and a preparation method thereof. BACKGROUND

[0002] The non-magnetic steel is a material with ultra-low magnetic permeability and is used in a transformer to reduce the leakage magnetic condition existing in the high-low voltage conversion process. The transformer shell is mainly prepared from low-carbon steel with low cost. The connection of the two heterogeneous materials has a large difference in the thermal expansion coefficient, and further causes stress concentration at the interface of the non-magnetic steel and the low-carbon steel, and finally causes interface cracking and other problems. At present, the transformer mainly uses austenitic stainless steel welding wire for connection, such as 316L welding wire. However, due to the influence of heat input, ferrite appears in the heat affected zone on the non-magnetic steel side, resulting in the magnetization of the joint. At present, there is no special welding wire for the low-carbon steel / non-magnetic steel joint. SUMMARY

[0003] The first object of the application is to provide a preparation method of a non-magnetic steel-low-carbon steel bimetallic composite component, which effectively solves the problem of magnetization on the non-magnetic steel side of the non-magnetic steel and low-carbon steel composite component, and can effectively reduce the residual stress at the interface.

[0004] The second object of the application is to provide a non-magnetic steel-low-carbon steel bimetallic composite component.

[0005] The first technical solution adopted by the application is a preparation method of a non-magnetic steel-low-carbon steel bimetallic composite component, specifically comprising the following steps:

[0006] Step 1: preparing a wire for a non-magnetic steel-low-carbon steel bimetallic composite component;

[0007] Step 2: performing entity modeling of the non-magnetic steel-low-carbon steel bimetallic composite component, determining the additive manufacturing path, and performing slice processing on the overall modeling.

[0008] Step 3: loading the ER50-6 welding wire into the additive manufacturing system and performing additive manufacturing on the low-carbon steel side;

[0009] Step 4: loading the wire prepared in step 1 into the additive manufacturing system, adjusting the corresponding additive manufacturing parameters, and performing additive manufacturing on the non-magnetic steel side;

[0010] Step 5: optimizing the surface roughness by mechanical cutting, and after optimization, strengthening the interface by laser impact and removing the residual stress on the surface.

[0011] The application is further characterized in that,

[0012] The step 1 is specifically as follows: the following powder is weighed according to mass percentage, namely, manganese powder 30%-40%, nickel powder 20%-30%, aluminum powder 5%-10%, carbon powder 10%-15%, lanthanum oxide powder 2%-3%, chromium powder 5%-8%, and iron powder as the balance, and the sum of the mass percentages of the above components is 100%; after the above powder is mixed according to the mass percentage, the outer skin adopts a low-carbon steel belt, and the powder core welding wire is drawn into a powder core welding wire with a diameter of 1.2 mm by using a powder core welding wire drawing machine.

[0013] In the step 2, Q345B is selected as the test substrate, the scanning path is a straight line, and a reciprocating accumulation mode is adopted; and the slice thickness is 3 mm-5 mm.

[0014] In the step 3, the process parameters of the additive manufacturing are as follows: an additive manufacturing current is 140 A-160 A, an additive manufacturing voltage is 16.2 V-19 V, an arc swing width is 6 mm-8 mm, an arc swing polygon angle is 60°-80°, a single-layer additive manufacturing speed is 300 mm / min-400 mm / min, an interlayer cooling temperature is 100℃-150℃, a protective gas is a mixed gas of 90 vol.% argon and 10 vol.% CO2, a gas flow rate is 15 L / min-20 L / min, and an additive height is 30 mm-40 mm.

[0015] In the step 4, the process parameters of the additive manufacturing are as follows: an additive manufacturing current is 180 A-190 A, an additive manufacturing voltage is 19.2 V-20.2 V, an arc swing width is 8 mm, an arc swing polygon angle is 60°-80°, a single-layer additive manufacturing speed is 300 mm / min-350 mm / min, an interlayer cooling temperature is 80℃-100℃, a protective gas is argon with a purity of 99.99 vol.%, a gas flow rate is 15 L / min-20 L / min, and an additive height is 20 mm-30 mm.

[0016] In the step 5, the surface roughness is optimized by using a numerical control milling machine, and the parameters of the laser impact are as follows: a laser pulse width is 20 ns-23 ns, a laser energy is 16.2 J-18 J, a spot diameter is 3 mm-4 mm, and a spot overlap rate is 40%-60%; and the absorption layer and the constraint layer of the laser impact are black adhesive tape and deionized water respectively.

[0017] The second technical solution adopted in the application is a non-magnetic steel-low-carbon steel double-metal composite component, and the component is prepared by using the above method.

[0018] The application has the following beneficial effects:

[0019] (1) The preparation method of the non-magnetic steel-low carbon steel bimetallic composite component of the present application designs the Mn-Ni-TiC-Fe alloy system, which is used as the alloy system of the non-magnetic steel side, has a very high Ni equivalent, and has a large tendency of austenitization.

[0020] (2) The preparation method of the non-magnetic steel-low carbon steel bimetallic composite component of the present application has good wettability of the Ni element with the non-magnetic steel side and the low carbon steel side, can be infinitely soluble with Fe, can effectively relieve the residual stress of the interface, and further prevent the joint from cracking.

[0021] (3) The preparation method of the non-magnetic steel-low carbon steel bimetallic composite component of the present application can effectively solve the problem of magnetization of the non-magnetic steel side of the non-magnetic steel-low carbon steel composite component.

[0022] (4) The preparation method of the non-magnetic steel-low carbon steel bimetallic composite component of the present application uses a laser impact method to strengthen the surface of the bimetallic component, which is pollution-free and can effectively refine the grains at the interface, thereby improving the interface mechanical properties. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a schematic diagram of the additive manufacturing system in the method of the present application;

[0024] Figure 2 is a non-cutting non-magnetic steel-low carbon steel bimetallic composite component prepared by Example 1 of the present application;

[0025] Figure 3 is a macroscopic cross-sectional view of the non-magnetic steel-low carbon steel prepared by Example 1 of the present application;

[0026] Figure 4 is a microstructure diagram of the non-magnetic steel-low carbon steel interface prepared by Example 1 of the present application.

[0027] In the figure, 1. First MIG wire feeder, 2. Second MIG wire feeder, 3. Six-axis arc welding robot, 4. Inverter AC welder, 5. Argon cylinder, 6. Ar+CO2 mixed gas cylinder, 7. Non-magnetic steel-low carbon steel bimetallic composite component, 8. Workbench. DETAILED DESCRIPTION

[0028] The present application will be described in detail below in conjunction with the drawings and specific embodiments.

[0029] The present application provides a preparation method of a non-magnetic steel-low carbon steel bimetallic composite component, specifically:

[0030] Step 1: preparing wire for non-magnetic steel-low carbon steel bimetallic composite component;

[0031] Step 1 is as follows: Weigh the following powders according to their mass percentages: 30%–40% manganese powder, 20%–30% nickel powder, 5%–10% aluminum powder, 10%–15% titanium dioxide powder, 2%–3% lanthanum oxide powder, 5%–8% chromium powder, and iron powder as the balance. The sum of the mass percentages of the above components is 100%. Mix the above powders according to their mass percentages to form the flux core of the flux-cored wire. The outer sheath of the flux-cored wire is made of low-carbon steel strip. Use a flux-cored wire drawing machine to draw the wire into a diameter of 1.2 mm. The filler content of the flux-cored wire is 25 wt.%–30 wt.%.

[0032] Step 2: Create a solid model of the non-magnetic steel-low carbon steel bimetallic composite component, determine the additive manufacturing path, and slice the overall model.

[0033] In step 2, Q345B is selected as the test substrate. The program designed in step 2 is taught to ensure that the welding torch travels along the set route, the scanning path is a straight line, and a reciprocating stacking method is used; the slice thickness is 3mm to 5mm.

[0034] Step 3: Load ER50-6 welding wire with a diameter of 1.2mm into the additive manufacturing system to perform additive manufacturing on the low carbon steel side;

[0035] Additive manufacturing systems such as Figure 1 As shown, the system includes a first MIG wire feeder 1, a second MIG wire feeder 2, an argon cylinder 5, an Ar+CO2 mixed gas cylinder 6, and a six-axis arc welding robot 3. Both the first MIG wire feeder 1 and the second MIG wire feeder 2 are connected to the six-axis arc welding robot 3. During additive manufacturing, the first MIG automatic wire feeder 1 is used to feed ER50-6 wire, and the second MIG automatic wire feeder is used to feed non-magnetic steel wire. The argon cylinder 5 and the Ar+CO2 mixed gas cylinder 6 are both connected to the six-axis arc welding robot 3, providing argon and Ar+CO2 mixed gas shielding gas during additive manufacturing. The system also includes an inverter-type AC welding machine 4 and a worktable 8. The six-axis arc welding robot 3 prints non-magnetic steel-low carbon steel bimetallic composite components 7 on the worktable 8. The negative terminal of the inverter-type AC welding machine 4 is connected to the worktable 4, and the positive terminal of the inverter-type AC CO2 gas shielded welding machine 4 is connected to the six-axis arc welding robot 3. The inverter-type AC welding machine 4 provides power for the arc welding process.

[0036] In step 3, the additive manufacturing process parameters are as follows: additive manufacturing current: 140A~160A, additive manufacturing voltage: 16.2V~19V, swing arc width: 6mm-8mm, swing arc zigzag angle: 60°-80°, single-layer additive manufacturing speed: 300mm / min-400mm / min, interlayer cooling temperature: 100℃~150℃, protective gas: 90 vol.% argon + 10 vol.% CO2 mixture, gas flow rate: 15L / min~20L / min, additive height: 30mm~40mm.

[0037] Step 4: Load the filament prepared in Step 1 into the additive manufacturing system, adjust the corresponding additive manufacturing parameters, and perform additive manufacturing on the non-magnetic steel side;

[0038] In step 4, the additive manufacturing process parameters are as follows: additive manufacturing current: 180A~190A, additive manufacturing voltage: 19.2V~20.2V, swing arc width: 6-8mm, swing arc zigzag angle: 60°-80°, single-layer additive manufacturing speed: 300mm / min-350mm / min, interlayer cooling temperature: 80℃~100℃, protective gas: argon with a purity of 99.99 vol.%, gas flow rate: 15L / min~20L / min, and additive height: 20mm~30mm.

[0039] Step 5: Optimize the surface roughness by mechanical cutting. After optimization, use laser shock to strengthen the interface and remove residual stress on the surface.

[0040] In step 5, the surface roughness is optimized using a CNC milling machine. The parameters of the laser shock are: laser pulse width of 20ns to 23ns, laser energy of 16.2J to 18J, spot diameter of 3mm to 4mm, and spot overlap rate of 40% to 60%. The absorption layer and the constraint layer of the laser shock are black tape and deionized water, respectively.

[0041] The present invention also discloses a non-magnetic steel-low carbon steel bimetallic composite component, which is prepared by the above method.

[0042] Example 1

[0043] The preparation method of the non-magnetic steel-low carbon steel bimetallic composite component is as follows:

[0044] Step 1: The following powders are weighed according to the mass percentage: manganese powder 30%, nickel powder 20%, aluminum powder 5%, carbonized titanium powder 10%, lanthanum oxide powder 2%, chromium powder 5%, and iron powder 28%. The above powders are mixed according to the mass percentage to form the core of the flux-cored wire. The outer sheath of the flux-cored wire is made of low-carbon steel strip. The flux-cored wire is drawn to a diameter of 1.2 mm using a flux-cored wire drawing machine. The filling rate of the flux-cored wire is 25 wt.%.

[0045] Step 2: Q345B is selected as the test substrate. The program designed in Step 2 is demonstrated to ensure that the welding gun follows the set route. The slice thickness is 3 mm, the scanning path is a straight line, and the reciprocating accumulation method is used.

[0046] Step 3: ER50-6 wire with a diameter of 1.2 mm is loaded into the additive manufacturing system. The additive manufacturing parameters are as follows: additive manufacturing current: 140 A, additive manufacturing voltage: 16.2 V, arc swing width: 8 mm, arc swing polyline angle: 80°, single-layer additive manufacturing speed: 400 mm / min, interlayer cooling temperature: 100℃, protective gas: 90 vol.% argon + 10 vol.% CO2 mixed gas, gas flow rate: 15 L / min, additive height: 30 mm, and low-carbon steel side additive manufacturing is performed.

[0047] Step 4: The wire prepared in Step 1 is loaded into the additive manufacturing system. The additive manufacturing parameters are as follows: additive manufacturing current: 180 A, additive manufacturing voltage: 19.2 V, arc swing width: 8 mm, arc swing polyline angle: 80°, single-layer additive manufacturing speed: 350 mm / min, interlayer cooling temperature: 60℃, protective gas: 99.99 vol.% pure argon, gas flow rate: 15 L / min, additive height: 20 mm, and non-magnetic steel side additive manufacturing is performed.

[0048] Step 5: The surface roughness is optimized using a numerical control milling machine, and the interface is strengthened using laser impact. The laser impact parameters are as follows: laser pulse width: 20 ns, laser energy: 16.2 J, spot diameter: 3 mm, spot overlap rate: 40%, and the absorption layer and constraint layer of laser impact are black tape and deionized water, respectively.

[0049] In Example 1, a non-magnetic steel-low-carbon steel bimetallic composite component preparation method and material are used. After high-magnification microstructure observation, the microstructure of the low-carbon steel side is pearlite and ferrite, and the microstructure of the non-magnetic steel side is a small amount of ferrite and austenite. After mechanical property testing, the yield strength is 425 MPa, the tensile strength is 530.5 MPa, and the magnetic permeability of the non-magnetic steel side is 1.261 x 10 -6H / m, no cracks and pores were found in the workpiece after ultrasonic flaw detection, and the measured mechanical properties meet the actual working condition requirements.

[0050] The method of electric arc additive can effectively solve the problem of large residual stress at the interface, relieve the residual stress caused by the difference of thermal expansion coefficient and thermal conductivity, and has its unique advantages for additive manufacturing of complex structure parts. As a high degree of freedom manufacturing method, it can efficiently and quickly prepare non-magnetic steel-low carbon steel composite components. At the same time, the non-magnetic steel-low carbon steel bimetallic composite component after additive manufacturing is subjected to surface strengthening treatment, further increasing its mechanical properties.

[0051] Example 2

[0052] The preparation method of the non-magnetic steel-low carbon steel bimetallic composite component is as follows:

[0053] Step 1: the following powder is weighed according to the mass percentage: manganese powder 40%, nickel powder 30%, aluminum powder 7%, titanium carbide powder 15%, lanthanum oxide powder 3%, chromium powder 5%, and the above powder is mixed as the core of the flux-cored wire according to the mass percentage, the outer skin of the flux-cored wire is low carbon steel strip, and the flux-cored wire is drawn to a diameter of 1.2 mm by using a flux-cored wire drawing machine; the filling rate of the flux-cored wire is 30wt.%.

[0054] Step 2: select Q345B as the test substrate, and perform teaching according to the program designed in step 2 to ensure that the welding gun moves according to the set route, the slice thickness is 5 mm, the scanning path is a straight line, and the reciprocating accumulation method is used;

[0055] Step 3: the ER50-6 wire with a diameter of 1.2 mm is loaded into the additive manufacturing system, the process parameters for additive manufacturing are as follows: additive manufacturing current: 160 A, additive manufacturing voltage: 19 V, arc swing width: 7 mm, arc swing angle: 70°, single-layer additive manufacturing speed: 350 mm / min, interlayer cooling temperature: 150℃, protective gas: mixed gas of 90vol.% argon+10vol.% CO2, gas flow rate: 20 L / min, additive height: 40 mm, and low carbon steel side additive manufacturing is carried out;

[0056] Step 4: the wire prepared in step 1 is loaded into the additive manufacturing system, the process parameters for additive manufacturing are as follows: additive manufacturing current: 190 A, additive manufacturing voltage: 20.2 V, arc swing width: 6 mm, arc swing angle: 70°, single-layer additive manufacturing speed: 320 mm / min, interlayer cooling temperature: 100℃, protective gas: argon with a purity of 99.99vol.%, gas flow rate: 20 L / min, additive height: 30 mm, and non-magnetic steel side additive manufacturing is carried out;

[0057] Step 5: The surface roughness is optimized by using a numerical control milling machine, and the interface is strengthened by laser shock. The parameters of laser shock are as follows: laser pulse width is 23 ns, laser energy is 18 J, spot diameter is 3 mm, spot overlap rate is 60%, and the absorption layer and constraint layer of laser shock are black tape and deionized water respectively.

[0058] In Example 2, a non-magnetic steel-low carbon steel bimetallic composite component preparation method and material are used. After high magnification microstructure observation, the microstructure of the low carbon steel side is pearlite and ferrite, and the microstructure of the non-magnetic steel side is a small amount of ferrite and austenite. After mechanical property testing, the yield strength is 447.1 MPa, the tensile strength is 552.8 MPa, the magnetic permeability of the non-magnetic steel side is 1.227 x 10 -6 H / m, and after ultrasonic flaw detection, no cracks or pores are found inside the workpiece. The measured mechanical properties meet the actual working condition requirements.

[0059] Example 3

[0060] A non-magnetic steel-low carbon steel bimetallic composite component preparation method is as follows:

[0061] Step 1: The following powders are weighed according to the mass percentage: manganese powder 40%, nickel powder 20%, aluminum powder 10%, titanium carbide powder 15%, lanthanum oxide powder 3%, chromium powder 8%, and iron powder 4%. The mixed powders are used as the core of the flux-cored wire. The outer skin of the flux-cored wire is made of low carbon steel strip. The flux-cored wire is drawn to a diameter of 1.2 mm using a flux-cored wire drawing machine. The filling rate of the flux-cored wire is 28wt.%.

[0062] Step 2: Q345B is selected as the test substrate. The program designed in Step 2 is demonstrated to ensure that the welding gun follows the set route. The slice thickness is 4 mm, the scanning path is a straight line, and the reciprocating accumulation method is used.

[0063] Step 3: The ER50-6 wire with a diameter of 1.2 mm is loaded into the additive manufacturing system. The additive manufacturing system is as shown in Figure 1 The process parameters of additive manufacturing are as follows: additive manufacturing current is 150 A, additive manufacturing voltage is 17 V, arc swing width is 6 mm, arc swing fold angle is 60°, single-layer additive manufacturing speed is 300 mm / min, interlayer cooling temperature is 120℃, protective gas is a mixture of 90vol.% argon and 10vol.% CO2, gas flow rate is 18 L / min, additive height is 35 mm, and the low carbon steel side is subjected to additive manufacturing.

[0064] Step 4: The wire prepared in step 1 is loaded into the additive manufacturing system, and the process parameters of the additive manufacturing are as follows: additive manufacturing current: 190 A, additive manufacturing voltage: 19.8 V, arc swing width: 8 mm, arc swing polyline included angle: 80°, single-layer additive manufacturing speed: 300 mm / min, interlayer cooling temperature: 100℃, protective gas: argon with a purity of 99.99 vol.%, gas flow rate: 16 L / min, additive height: 25 mm, and the non-magnetic steel side is subjected to additive manufacturing;

[0065] Step 5: The surface roughness is optimized by using a numerical control milling machine, and the interface is strengthened by laser impact, and the parameters of the laser impact are as follows: laser pulse width: 21 ns, laser energy: 18 J, spot diameter: 3 mm, spot overlap rate: 60%, and the absorption layer and constraint layer of the laser impact are black tape and deionized water respectively.

[0066] In example 3, a non-magnetic steel-low carbon steel bimetallic composite component preparation method and material are used, and after high magnification microstructure observation, the microstructure of the low carbon steel side is pearlite and ferrite, and the microstructure of the non-magnetic steel side is a small amount of ferrite and austenite. After mechanical property test, the yield strength is 434.2 MPa, the tensile strength is 575.2 MPa, the magnetic permeability is 1.233 x 10 -6 H / m, and after ultrasonic flaw detection, no cracks, pores or other defects are found in the workpiece, and the measured mechanical properties meet the actual working condition requirements.

[0067] Example 4

[0068] A preparation method of a non-magnetic steel-low carbon steel bimetallic composite component is as follows:

[0069] Step 1: The following powders are weighed according to the mass percentage: manganese powder 35%, nickel powder 25%, aluminum powder 7%, titanium carbide powder 12%, lanthanum oxide powder 2%, chromium powder 5%, and iron powder 14%. After mixing the above powders according to the mass percentage, the mixture is used as the core of the flux-cored wire. The outer skin of the flux-cored wire is a low carbon steel strip, which is drawn into a flux-cored wire with a diameter of 1.2 mm using a flux-cored wire drawing machine. The filling rate of the flux-cored wire is 30 wt.%.

[0070] Step 2: Q345B is selected as the test substrate, and the program designed in step 2 is demonstrated to ensure that the welding gun moves along the set route. The slice thickness is 4 mm, the scanning path is a straight line, and the reciprocating accumulation method is used.

[0071] Step 3: The ER50-6 wire with a diameter of 1.2 mm is loaded into the additive manufacturing system, and the additive manufacturing system is as follows: Figure 1The process parameters of the additive manufacturing are as follows: additive manufacturing current: 150 A, additive manufacturing voltage: 18 V, arc swing width: 6 mm, arc swing polyline included angle: 60°, single-layer additive manufacturing speed: 300 mm / min, interlayer cooling temperature: 120℃, protective gas: mixed gas of 90 vol.% argon and 10 vol.% CO2, gas flow rate: 20 L / min, additive height: 30 mm, and the low-carbon steel side is subjected to additive manufacturing.

[0072] Step 4: The wire prepared in step 1 is loaded into the additive manufacturing system, and the process parameters of the additive manufacturing are as follows: additive manufacturing current: 180 A, additive manufacturing voltage: 19.2 V, arc swing width: 8 mm, arc swing polyline included angle: 80°, single-layer additive manufacturing speed: 300 mm / min, interlayer cooling temperature: 100℃, protective gas: argon with a purity of 99.99 vol.%, gas flow rate: 20 L / min, additive height: 30 mm, and the non-magnetic steel side is subjected to additive manufacturing.

[0073] Step 5: The surface roughness is optimized by using a numerical control milling machine, and the interface is strengthened by laser impact. The parameters of the laser impact are as follows: laser pulse width: 20 ns, laser energy: 18 J, spot diameter: 3 mm, spot overlap rate: 60%, and the absorption layer and constraint layer of the laser impact are black tape and deionized water, respectively.

[0074] In Example 4, a non-magnetic steel-low-carbon steel bimetallic composite component is prepared by using a preparation method and material. After high-magnification microstructure observation, the microstructure of the low-carbon steel side is pearlite and ferrite, and the microstructure of the non-magnetic steel side is a small amount of ferrite and austenite. After mechanical property testing, the yield strength is 425 MPa, the tensile strength is 530.5 MPa, the magnetic permeability of the non-magnetic steel side is 1.261 x 10 -6 H / m, and no cracks or pores are found in the workpiece after ultrasonic flaw detection. The measured mechanical properties meet the requirements of actual working conditions.

[0075] Example 5

[0076] A preparation method of a non-magnetic steel-low-carbon steel bimetallic composite component is as follows:

[0077] Step 1: The following powders are weighed according to the mass percentage: manganese powder 40%, nickel powder 25%, aluminum powder 10%, titanium carbide powder 15%, lanthanum oxide powder 2%, chromium powder 5%, and iron powder 3%. The sum of the mass percentages of the above components is 100%. The mixed powders are used as the core of the flux-cored wire according to the mass percentage. The outer skin of the flux-cored wire is a low-carbon steel strip. The flux-cored wire is drawn into a flux-cored wire with a diameter of 1.2 mm by using a flux-cored wire drawing machine. The filling rate of the flux-cored wire is 25 wt.%.

[0078] Step 2: Q345B is selected as the test substrate, and the program designed in step 2 is demonstrated to ensure that the welding gun moves along the set route, the slice thickness is 4 mm, the scanning path is a straight line, and the reciprocating accumulation mode is adopted;

[0079] Step 3: ER50-6 welding wire with a diameter of 1.2 mm is loaded into the additive manufacturing system, and the additive manufacturing system is as shown in Figure 1 The process parameters of additive manufacturing are as follows: additive manufacturing current: 150 A, additive manufacturing voltage: 18 V, arc swing width: 6 mm, arc swing polyline included angle: 60°, single-layer additive manufacturing speed: 300 mm / min, interlayer cooling temperature: 130℃, shielding gas: mixed gas of 90 vol.% argon and 10 vol.% CO2, gas flow rate: 18 L / min, additive height: 35 mm, and low-carbon steel side additive manufacturing is performed;

[0080] Step 4: The wire prepared in step 1 is loaded into the additive manufacturing system, and the additive manufacturing process parameters are as follows: additive manufacturing current: 186, additive manufacturing voltage: 20.2 V, arc swing width: 8 mm, arc swing polyline included angle: 80°, single-layer additive manufacturing speed: 300 mm / min, interlayer cooling temperature: 80℃-100℃, shielding gas: argon with a purity of 99.99 vol.%, gas flow rate: 15-20 L / min, additive height: 25 mm, and non-magnetic steel side additive manufacturing is performed;

[0081] Step 5: A numerical control milling machine is used to optimize the surface roughness, and laser shock is used to strengthen the interface. The laser shock parameters are as follows: laser pulse width: 22 ns, laser energy: 17.6 J, spot diameter: 3 mm, spot overlap rate: 50%, and the absorption layer and constraint layer of laser shock are black tape and deionized water, respectively.

[0082] In example 5, a non-magnetic steel-low-carbon steel bimetallic composite component preparation method and material are adopted. After high-magnification microscopic observation, the low-carbon steel side has a microstructure of pearlite and ferrite, and the non-magnetic steel side has a small amount of ferrite and austenite. After mechanical property testing, the yield strength is 432.8 MPa, the tensile strength is 523.6 MPa, the magnetic permeability of the non-magnetic steel side is 1.216 x 10 -6 H / m, and no cracks or pores are found in the workpiece after ultrasonic testing. The measured mechanical properties meet the actual working condition requirements.

Claims

1. A method for producing a non-magnetic steel - low carbon steel bimetallic composite member, characterized by, Specifically, Step 1: preparing a wire for a non-magnetic steel-low carbon steel bimetallic composite component; Step 1 specifically is: the following powder is weighed according to mass percentage: manganese powder 30%-40%, nickel powder 20%-30%, aluminum powder 5%-10%, carbon titanium powder 10%-15%, lanthanum oxide powder 2%-3%, chromium powder 5%-8%, and iron powder as the balance, the sum of the mass percentages of the above components is 100%; after mixing the above powders according to mass percentage, the outer skin is a low carbon steel strip, and the flux-cored wire is drawn into a diameter of 1.2mm by using a flux-cored wire drawing machine; Step 2: modeling the non-magnetic steel-low carbon steel bimetallic composite component, determining the additive manufacturing path, and slicing the overall model; Step 3: loading the ER50-6 welding wire into the additive manufacturing system, and performing additive manufacturing on the low carbon steel side; Step 4: loading the wire prepared in step 1 into the additive manufacturing system, adjusting the corresponding additive manufacturing parameters, and performing additive manufacturing on the non-magnetic steel side; In step 4, the process parameters of additive manufacturing are: additive manufacturing current: 180A-190A, additive manufacturing voltage: 19.2V-20.2V, arc swing width: 8mm, arc swing polyline angle: 60°-80°, single-layer additive manufacturing speed: 300mm / min-350mm / min, interlayer cooling temperature: 80℃-100℃, shielding gas: argon gas with a purity of 99.99vol.%, gas flow rate: 15L / min-20L / min, additive height: 20mm-30mm; Step 5: optimizing the surface roughness by mechanical cutting, and strengthening the interface and removing the residual stress on the surface by laser impact after optimization.

2. The method of producing a non-magnetic steel-low carbon steel bimetallic composite member according to claim 1, characterized by, In step 2, Q345B is selected as the test substrate, the scanning path is a straight line, and the reciprocating accumulation method is used; the slice thickness is 3mm-5mm.

3. The method for preparing the non-magnetic steel-low carbon steel bimetallic composite component according to claim 1, characterized in that, In step 3, the process parameters of additive manufacturing are: additive manufacturing current: 140A-160A, additive manufacturing voltage: 16.2V-19V, arc swing width: 6mm-8mm, arc swing polyline angle: 60°-80°, single-layer additive manufacturing speed: 300mm / min-400mm / min, interlayer cooling temperature: 100℃-150℃, shielding gas: a mixture of 90vol.% argon and 10vol.% CO2, gas flow rate: 15L / min-20L / min, additive height: 30mm-40mm.

4. The method of producing a non-magnetic steel-low carbon steel bimetallic composite member according to claim 1, characterized by, In step 5, the surface roughness is optimized by a numerical control milling machine, and the parameters of laser impact are: laser pulse width: 20ns-23ns, laser energy: 16.2J-18J, spot diameter: 3mm-4mm, and spot overlap rate: 40%-60%; the absorption layer and the constraint layer of laser impact are black tape and deionized water, respectively.

5. A non-magnetic steel - low carbon steel bimetallic composite member, characterized by, Prepared by the method of any one of claims 1-4.

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