CN111663134A - Method for producing titanium steel composite plate by metal powder solid deposition-rolling - Google Patents

Abstract

The invention belongs to the field of composite plate production, and in particular relates to a method for producing a titanium-steel composite plate by solid-state deposition-rolling of metal powder. First, clean the surface of the steel (or titanium alloy) substrate, preheat the titanium alloy (or carbon steel, stainless steel) powder to be spray-deposited, and then use aerodynamic spraying technology to spray and deposit the metal powder on the surface of the substrate in a solid state to form a deposition layer . The obtained substrate with the deposition layer is kept for a period of time, heated to a high temperature, and rolled, and then the obtained clad plate is heat-treated to obtain a titanium-steel clad plate with excellent performance. The invention can improve the manufacturing efficiency of the titanium-steel composite plate, effectively reduce the scrap rate, and can manufacture the titanium-steel composite plate of any thickness and length.

Description

Method for producing titanium-steel clad plate by solid-state deposition of metal powder-rolling

technical field

The invention belongs to the field of composite plate production, and in particular relates to a method for producing a titanium-steel composite plate by metal powder solid-state deposition-rolling.

Background technique

Titanium-steel clad plate has both excellent corrosion resistance and toughness, and is widely used in petrochemical, metallurgy, electric power and other industries. At present, the technology used to produce titanium-steel clad plates is explosive welding technology or a combination of welding and rolling technology. Explosive welding has shortcomings such as limited size and interface melting, and welding-rolling technology has shortcomings such as interface oxidation and intermediate cracking, which cannot produce large-size weld-free titanium-steel clad plates.

SUMMARY OF THE INVENTION

The object of the present invention is to provide a method for producing a titanium-steel composite plate by solid-state deposition of metal powders by rolling, which utilizes aerodynamic spraying technology to deposit a layer of titanium alloy (or steel) deposition layer on the surface of a steel (or titanium alloy) substrate. The titanium-steel clad plate is obtained by heating, heat-preserving and high-temperature rolling. Therefore, the manufacturing efficiency of the titanium-steel clad plate can be improved, the scrap rate can be effectively reduced, and the titanium-steel clad plate of any thickness and length can be manufactured.

The technical scheme of the present invention is as follows:

A method for producing a titanium-steel clad plate by metal powder solid-state deposition-rolling, comprising the following steps:

(1) Surface cleaning of steel or titanium alloy substrates;

(2) Preheating the titanium alloy or steel powder to be deposited in solid state, the preheating temperature is 100～1200℃, and the holding time is 0.5～180min;

(3) spraying the preheated titanium alloy or steel powder in step (2) on the surface of the steel or titanium alloy substrate by using aerodynamic spraying technology, spraying the titanium alloy powder on the surface of the steel substrate, and spraying the steel powder on the surface of the titanium alloy substrate, forming a deposition layer on the surface of the substrate;

(4) placing the substrate with the deposition layer obtained after the deposition in step (3) in a heating furnace for a period of time, the holding temperature is 100-1200°C, and the holding time is 10-180 min;

(5) heating the plate obtained by heat preservation in step (4) to 100-1300° C., and then rolling, with a rolling reduction ratio of 10-80%;

(6) Perform heat treatment on the titanium-steel clad plate obtained by rolling in step (5), keep the temperature at 100-1000° C. for 10-180 minutes, and cool in air, furnace or oil.

In the method for producing a titanium-steel clad plate by metal powder solid-state deposition-rolling, in step (1), the steel or titanium alloy substrate is a carbon steel, stainless steel or titanium alloy plate.

In the method for producing a titanium-steel clad plate by solid-state deposition of metal powders by rolling, in step (2), the titanium alloy or steel powder is commercial titanium alloy, stainless steel or carbon steel powder, and the preheating temperature is 100-1200°C, The holding time is 0.5 to 180 minutes.

In the method for producing a titanium-steel clad plate by solid-state deposition of metal powder-rolling, in step (3), the aerodynamic spraying conditions are: the accelerating gas is one or more mixed gases of compressed air, nitrogen, and helium, The gas pressure is 1.0～4.0MPa, the gas heating temperature is 100～1200℃, the powder feeding rate is 5～150g/min, the distance between the spray gun is 10～40mm from the steel or titanium alloy substrate, and the thickness of the deposition layer is 20～3000μm.

In the method for producing a titanium-steel composite plate by solid-state deposition of metal powder by rolling, in step (3), the preferred gas heating temperature is 400-500° C., and the thickness of the deposition layer is 100-200 μm.

In the method for producing a titanium-steel clad plate by solid-state deposition of metal powder and rolling, in step (4), the preferred holding temperature is 800-1100° C., and the holding time is 30-60 minutes.

In the method for producing a titanium-steel composite plate by solid-state deposition of metal powder and rolling, in step (5), the preferred heating temperature of the plate is 900-1100° C., and the rolling reduction ratio is 30-50%.

In the method for producing a titanium-steel clad plate by solid-state deposition of metal powder by rolling, in step (6), the preferred heat treatment includes keeping the temperature at 500-700° C. for 60-90 minutes, and cooling in air, furnace or oil.

The design idea of the present invention is:

The method of the invention first cleans the surface of the steel (or titanium alloy) substrate, preheats the titanium alloy (or carbon steel, stainless steel) powder to be spray-deposited, and then adopts aerodynamic spraying technology to spray and deposit the metal powder on the surface of the substrate in a solid state A deposition layer is formed. The obtained substrate with the deposition layer is kept for a period of time, heated to a high temperature, and rolled, and then the obtained clad plate is heat-treated to obtain a titanium-steel clad plate with excellent performance.

The advantages and beneficial effects of the present invention are:

1. The present invention can conveniently produce titanium-steel composite panels with different compositions by changing the powder composition.

2. The present invention can quickly produce a deposition layer of any thickness through aerodynamic spraying technology, thereby obtaining titanium-steel composite plates with different thicknesses.

3. The present invention realizes the pre-combination of two metal components through aerodynamic spraying technology, the interface between the two metals is clean, and the oxidation and cracking problems existing in the existing explosive welding technology and welding-rolling technology are avoided.

4. The invention has simple process and low cost, and can produce large-sized titanium-steel composite plates.

Description of drawings

1-2 are metallographic photographs of the interface of a metal powder solid-state deposition-rolled titanium-steel clad plate produced in Example 1.

Detailed ways

The embodiments of the present invention are described in detail below, and the implementation is carried out on the premise of the technical solution of the invention, and a detailed implementation manner and a specific operation process are given, but the protection scope of the present invention is not limited to the following embodiments.

Example 1: Production of carbon steel/titanium composite panels

In this embodiment, the Q235 carbon steel substrate is pickled, then rinsed and dried with acetone and alcohol, and finally activated by sandblasting. The titanium alloy powder was heated to 300°C in a vacuum furnace and kept for 60min. The heated titanium alloy powder is solid-deposited on the surface of the Q235 carbon steel substrate by using the pneumatic spraying technology. Compressed air is used as the accelerating gas. 20mm, the thickness of the production deposition layer is 500μm. The substrate with the deposition layer was placed in a heating furnace and heated to 400° C. and kept for 120 min. The titanium-steel clad plate after stress relief annealing is heated to 900° C. and then rolled with a rolling reduction ratio of 50%. The rolled titanium-steel clad plate is heated to 600°C, kept for 30 minutes, and cooled in air to obtain a titanium-steel clad plate with high bonding strength and good toughness. Its performance indicators are as follows: yield strength 300MPa, tensile shear strength 150MPa.

As shown in Figure 1-Figure 2, the lower part of the picture is the interface between the carbon steel and the titanium layer. It can be seen that the interface of the two phases is straight, well combined, and free of cracks.

Example 2: Production of stainless steel/titanium composite panels

In this embodiment, the 304 stainless steel substrate is pickled, then rinsed and dried with acetone and alcohol, and finally activated by sandblasting. The titanium alloy powder was heated to 300°C in a vacuum furnace and kept for 60min. The heated titanium alloy (alloy grade: Ti65) powder was solid-deposited on the surface of the 304 stainless steel substrate by the pneumatic spraying technology, and compressed air was used as the accelerating gas, the main air pressure was 2.5MPa, the heating temperature was 600℃, and the powder feeding rate was 30g /min, the spray gun is 30mm away from the workpiece, and the thickness of the production deposition layer is 800μm. The substrate with the deposition layer was placed in a heating furnace and heated to 400° C. and kept for 120 min. The titanium-steel clad plate after stress relief annealing is heated to 1000° C. and then rolled with a rolling reduction ratio of 50%. The rolled titanium-steel clad plate is heated to 600°C, kept for 30 minutes, and cooled in a furnace to obtain a titanium-steel clad plate with high bonding strength and good toughness. Its performance indicators are as follows: yield strength 300MPa, tensile shear strength 160MPa.

Example 3: Production of Titanium/Carbon Steel Composite Panels

In this embodiment, the titanium alloy (alloy grade: Ti65) substrate is pickled, then rinsed and dried with acetone and alcohol, and finally activated by sandblasting. The Q235 carbon steel powder was placed in a vacuum furnace and heated to 400°C for 60min. The heated Q235 carbon steel powder is solid-deposited on the surface of the titanium alloy substrate by using the pneumatic spraying technology. Compressed air is used as the accelerating gas. 40mm, the thickness of the production deposition layer is 500μm. The substrate with the deposition layer was placed in a heating furnace and heated to 700° C. and kept for 120 min. The titanium-steel clad plate after stress relief annealing is heated to 1100° C. and then rolled with a rolling reduction ratio of 50%. The rolled titanium-steel clad plate is heated to 600°C, kept for 30 minutes, and cooled in oil to obtain a titanium-steel clad plate with high bonding strength and good toughness. Its performance indicators are as follows: yield strength 420MPa, tensile shear strength 180MPa.

Example 4: Production of Titanium/Stainless Steel Composite Panels

In this embodiment, the titanium alloy (alloy grade: Ti65) substrate is pickled, then rinsed and dried with acetone and alcohol, and finally activated by sandblasting. The 304 stainless steel powder was placed in a vacuum furnace and heated to 400°C for 60min. The heated 304 stainless steel powder is solid-deposited on the surface of the carbon steel substrate by pneumatic spraying technology. Compressed air is used as the acceleration gas. The main air pressure is 2.5MPa, the heating temperature is 600℃, the powder feeding rate is 80g/min, and the distance between the spray gun and the workpiece is 10mm. , the production deposition layer thickness is 2000 μm. The substrate with the deposition layer was placed in a heating furnace and heated to 400° C. and kept for 120 min. The titanium-steel clad plate after stress relief annealing is heated to 1200° C., and then rolled, and the rolling reduction ratio is 60%. The rolled titanium-steel clad plate is heated to 700°C, kept for 30 minutes, and cooled in air to obtain a titanium-steel clad plate with high bonding strength and good toughness. Its performance indicators are as follows: yield strength 400MPa, tensile shear strength 180MPa.

The results of the examples show that the titanium-steel composite plate produced by this method has a straight titanium/steel interface, high bonding strength, and good strength and toughness. The method is simple to operate, easy to control, and has strong adaptability, and there is no report at home and abroad that it can produce large-size, multi-component titanium-steel clad plates.

Claims (8)

1. A method for producing a titanium steel composite plate by metal powder solid deposition-rolling is characterized by comprising the following steps:

(1) cleaning the surface of the steel or titanium alloy substrate;

(2) preheating titanium alloy or steel powder subjected to pseudo-solid deposition, wherein the preheating temperature is 100-1200 ℃, and the heat preservation time is 0.5-180 min;

(3) spraying the preheated titanium alloy or steel powder in the step (2) on the surface of a steel or titanium alloy substrate by adopting an aerodynamic spraying technology, spraying the titanium alloy powder on the surface of a steel substrate, spraying the steel powder on the surface of the titanium alloy substrate, and forming a deposition layer on the surface of the substrate;

(4) placing the substrate with the deposition layer obtained after deposition in the step (3) in a heating furnace, and keeping the temperature for a period of time, wherein the temperature for keeping the temperature is 100-1200 ℃, and the time for keeping the temperature is 10-180 min;

(5) heating the plate obtained by heat preservation in the step (4) to 100-1300 ℃, and then rolling with the rolling reduction rate of 10-80%;

(6) and (4) carrying out heat treatment on the titanium steel composite plate obtained by rolling in the step (5), preserving heat for 10-180 min at 100-1000 ℃, and cooling in air, a furnace or oil.

2. The method for producing a titanium steel composite plate by solid state deposition-rolling of metal powder according to claim 1, wherein in the step (1), the steel or titanium alloy substrate is a plate of carbon steel, stainless steel or titanium alloy.

3. The method for producing the titanium-steel composite plate by the metal powder solid deposition-rolling according to claim 1, wherein in the step (2), the titanium alloy or the steel powder is powder of commercial titanium alloy, stainless steel or carbon steel, the preheating temperature is 100-1200 ℃, and the heat preservation time is 0.5-180 min.

4. The method for producing titanium steel composite plates by solid state deposition-rolling of metal powders according to claim 1, wherein in the step (3), the aerodynamic spraying conditions are as follows: the accelerating gas is one or a mixture of more than two of compressed air, nitrogen and helium, the gas pressure is 1.0-4.0 MPa, the gas heating temperature is 100-1200 ℃, the powder feeding speed is 5-150 g/min, the spray gun is 10-40 mm away from the steel or titanium alloy substrate, and the thickness of the deposition layer is 20-3000 μm.

5. The method for producing the titanium steel composite plate by the metal powder solid deposition-rolling according to claim 4, wherein in the step (3), the preferable gas heating temperature is 400-500 ℃, and the thickness of the deposited layer is 100-200 μm.

6. The method for producing the titanium steel composite plate by the metal powder solid deposition-rolling according to claim 1, wherein in the step (4), the preferable heat preservation temperature is 800-1100 ℃, and the heat preservation time is 30-60 min.

7. The method for producing the titanium steel composite plate by the metal powder solid deposition-rolling according to claim 1, wherein in the step (5), the preferable heating temperature of the plate is 900-1100 ℃, and the rolling reduction rate is 30-50%.

8. The method for producing titanium steel composite plates by solid state deposition-rolling of metal powders according to claim 1, wherein in step (6), the preferred heat treatment comprises holding at 500 to 700 ℃ for 60 to 90min, and cooling in air, furnace or oil.

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