A high temperature alloy composite plate and preparation method thereof

Abstract

The present invention discloses a high-temperature alloy composite plate and a preparation method thereof, wherein the high-temperature alloy composite plate comprises a NS1102 alloy base layer and a GH4169 alloy composite layer arranged on the NS1102 alloy base layer; the thickness ratio of the NS1102 alloy base layer to the GH4169 alloy composite layer is greater than 4: 1. The high-temperature alloy composite plate reduces the usage of the GH4169 alloy by composite the GH4169 alloy and the NS1102 alloy, can control the usage cost, and has the performance of resisting fluid scouring at high temperature.

Description

Technical Field

[0001] The invention relates to the field of nickel-based alloys, and more specifically, to a high-temperature alloy composite plate and a preparation method thereof. Background Art

[0002] The polysilicon reactor uses NS1102 nickel-based alloy as the equipment material. Since the polysilicon reactor is used at high temperatures, the maximum operating temperature is close to 600°C. However, some pipeline interfaces are eroded by powdered solids, which has a great impact on the use of the equipment. Therefore, there is an urgent need for high-temperature and wear-resistant materials to meet the use requirements.

[0003] At present, the common practice is to increase the design thickness of the material to increase the service life of the equipment, but the disadvantages of doing so are also obvious. First, unlike process erosion, powdered solid erosion is not uniform wear, but concentrated in a certain channel, causing local damage, and the effect of increasing thickness is not obvious. Another way to deal with corrosion and wear is to weld a layer of nickel-based alloy NiCrMo-3 on the surface to improve wear resistance, but due to the low strength of the alloy, the wear resistance effect is not obvious; in addition, there are also composite plate materials made by explosive composite or mechanical composite, but due to the bonding strength of the composite layer and other reasons, the service life is not high and the problem of powdered solid erosion cannot be solved.

[0004] By comparing a large number of high-temperature resistant materials, it was found that GH4169 alloy is an ideal material to solve this problem. GH4169 alloy is a type of iron, nickel, and chromium-based alloy with a large amount of strengthening elements such as Mo, Al, Ti, and Nb added. It has very excellent high-temperature performance at around 600°C and is resistant to fluid erosion. However, due to the very high material cost, it is not suitable for large-scale industrial applications. It is currently widely used in special fields such as aviation engines and oil and gas extraction.

[0005] Therefore, it is necessary to design a GH4169 alloy composite plate, which is composited with GH4169 alloy and NS1102 alloy to reduce the usage of GH4169 alloy, control the cost of use, and at the same time have the performance of resisting fluid erosion under high temperature. Summary of the invention

[0006] In view of the above-mentioned defects existing in the prior art, the purpose of the present invention is to provide a high-temperature alloy composite plate and a preparation method thereof. By combining GH4169 alloy and NS1102 alloy together, the usage of GH4169 alloy can be reduced, the use cost can be controlled, and at the same time, the plate has the performance of resisting fluid erosion under high temperature.

[0007] To achieve the above object, the present invention adopts the following technical solutions:

[0008] A first aspect of the present invention provides a high-temperature alloy composite plate, comprising a NS1102 alloy base layer and a GH4169 alloy clad layer arranged on the NS1102 alloy base layer; the thickness ratio of the NS1102 alloy base layer to the GH4169 alloy clad layer is greater than 4:1.

[0009] Preferably, the bonding strength between the NS1102 alloy base layer and the GH4169 alloy composite layer is greater than 300 MPa.

[0010] Preferably, the thickness of the NS1102 alloy base layer is 8 to 50 mm, and the thickness of the GH4169 alloy composite layer is 2 to 4 mm.

[0011] Preferably, the GH4169 alloy composite layer of the high temperature alloy composite plate has a tensile strength of ≥1400MPa and a hardness HB of ≥430 at room temperature; and / or

[0012] The GH4169 alloy composite layer of the high-temperature alloy composite plate has a tensile strength of ≥1160 MPa at 600°C.

[0013] A second aspect of the present invention provides a method for preparing the high temperature alloy composite plate according to the first aspect of the present invention, comprising the following steps:

[0014] S1, blank preparation, selecting NS1102 alloy slab and GH4169 alloy slab, and cleaning the bonding surface of the NS1102 alloy slab and the GH4169 alloy slab;

[0015] S2, welding, welding the NS1102 alloy slab and the GH4169 alloy slab to obtain a composite slab, leaving pores at the ends of the composite slab, welding a vacuum nozzle on the pores, and then performing a vacuum treatment;

[0016] S3, rolling, heating and keeping the composite slab after the treatment in step S2, and then rolling the composite slab for multiple passes;

[0017] S4, heat treatment, solution treatment of the rolled composite slab, air cooling, and then aging heat treatment and air cooling to room temperature.

[0018] Preferably, in step S1:

[0019] The thickness of the NS1102 alloy slab is more than 3 times the thickness of the NS1102 alloy base layer; the thickness of the GH4169 alloy slab is more than 3 times the thickness of the GH4169 alloy composite layer; and / or

[0020] The surface cleaning is milling or grinding.

[0021] Preferably, in step S2, after the vacuum treatment, the vacuum degree of the bonding surface of the composite slab is less than 0.1 Pa.

[0022] Preferably, in step S3, the heating temperature of the composite slab is 1100-1140° C., and the holding time t satisfies the following formula:

[0023] t = k × h;

[0024] In the formula, t is the holding time, in min;

[0025] k is a multiple, ranging from 2 to 4;

[0026] h is the thickness of the composite slab, in mm.

[0027] Preferably, in the step S3, during the multi-pass rolling process, the reduction ratio of the first two passes is 5%.

[0028] Preferably, in step S4:

[0029] During the solution treatment, the solution temperature is 1020±10°C and the holding time is 2±0.5h; and / or

[0030] During the aging heat treatment process, the aging treatment temperature is 720±20° C. and the insulation time is 24 to 28 hours.

[0031] The present invention has the following beneficial effects:

[0032] 1. The high-temperature alloy composite plate and the preparation method thereof of the present invention can reduce the usage of GH4169 alloy by compounding GH4169 alloy and NS1102 alloy, thereby controlling the usage cost and having the performance of resisting fluid erosion under high temperature;

[0033] 2. The preparation method of the high-temperature alloy composite plate of the present invention is to first weld the GH4169 alloy slab and the NS1102 alloy slab into a composite slab, and then evacuate and heat the bonding surface of the composite slab to ensure that the metal on the bonding surface of the composite slab is fully diffused, and then perform multiple rolling and heat treatment to make the bonding strength of the bonding surface of the high-temperature alloy composite plate greater than 300MPa. DETAILED DESCRIPTION

[0034] In order to better understand the above technical solution of the present invention, the technical solution of the present invention is further described below in conjunction with embodiments.

[0035] A high-temperature alloy composite plate of the present invention comprises a NS1102 alloy base layer and a GH4169 alloy composite layer arranged on the NS1102 alloy base layer; the thickness ratio of the NS1102 alloy base layer to the GH4169 alloy composite layer is greater than 4:1; wherein the thickness of the NS1102 alloy base layer is 8 to 50 mm, and the thickness of the GH4169 alloy composite layer is 2 to 4 mm.

[0036] On the high-temperature alloy composite plate, the bonding strength between the NS1102 alloy base layer and the GH4169 alloy composite layer is greater than 300MPa; the GH4169 alloy composite layer of the high-temperature alloy composite plate has a tensile strength of ≥1400MPa and a hardness HB of ≥430 at room temperature; at 600°C, the tensile strength of the GH4169 alloy composite layer is ≥1160MPa.

[0037] The method for preparing the high temperature alloy composite plate comprises the following steps:

[0038] S1, blank preparation, selecting NS1102 alloy slab and GH4169 alloy slab, and cleaning the bonding surface of NS1102 alloy slab and GH4169 alloy slab;

[0039] The specific process is as follows: First, prepare the NS1102 alloy slab and the GH4169 alloy slab. The slab specifications are enlarged by more than 3 times according to the thickness of the base layer and the cladding layer of the high-temperature alloy composite plate to ensure that the organization is fully deformed and uniform, that is, the thickness of the NS1102 alloy slab is more than 3 times the thickness of the NS1102 alloy base layer; the thickness of the GH4169 alloy slab is more than 3 times the thickness of the GH4169 alloy cladding layer; for example: the cladding layer + base layer of the high-temperature alloy composite plate is 3mm + 12mm, then the thickness of the GH4169 alloy slab must be at least 9mm, and the thickness of the NS1102 alloy slab must be at least 36mm. The specific magnification factor should be determined in combination with the rolling capacity of the rolling mill and the heating furnace heating slab specification capacity. Then, the prepared NS1102 alloy slab and GH4169 alloy slab are cleaned on the bonding surface, such as milling or polishing, and no defects such as scale and cracks that affect the diffusion bonding strength of the assembly surface are allowed to exist on the bonding surface.

[0040] S2, welding, welding the NS1102 alloy slab and the GH4169 alloy slab to obtain a composite slab, leaving pores at the ends of the composite slab, and welding a vacuum nozzle on the pores, and then performing a vacuum treatment;

[0041] The specific process is as follows: two NS1102 alloy slabs and GH4169 alloy slabs of the same length and width are welded, and an air hole is left at the end of the composite slab during the welding process, and a vacuum nozzle is welded at the air hole to draw a vacuum, and then a vacuum device is used to carry out vacuum treatment until the vacuum degree of the composite slab joint surface is less than 0.1Pa.

[0042] S3, rolling, heating and keeping the composite slab after the treatment in step S2, and then rolling the composite slab for multiple passes;

[0043] The specific process is as follows: the composite slab processed in step S2 is heated and kept warm for a period of time, the heating temperature is controlled to be 1100-1140°C, and the holding time t satisfies: t=k×h; wherein t is the holding time in min, k is a multiple, k ranges from 2 to 4, and h is the thickness of the composite slab in mm.

[0044] Through the above treatment, it is ensured that the metal on the bonding surface of the composite slab is fully diffused; then multiple rolling passes are carried out, and a 4-roll reversible medium plate rolling mill can be used for rolling. The first two rolling passes are controlled at a reduction rate of 3% to 5% to ensure small deformation, no cracking of the weld, prevent damage to the vacuum, and ensure smooth bonding of the bonding surface. The subsequent rolling passes are carried out normally according to the rolling pass distribution of the medium plate rolling mill.

[0045] S4, heat treatment, solution treatment of the rolled composite slab, air cooling, and then aging heat treatment and air cooling to room temperature.

[0046] The specific process is as follows: the heat treatment adopts solid solution + aging heat treatment, the rolled composite slab is subjected to solid solution treatment, the solid solution temperature is controlled to be 1020±10℃, the holding time is 2±0.5h, and then air-cooled, the purpose is to ensure that no deformation or bending occurs during the cooling process; then the composite slab is subjected to aging heat treatment, the aging treatment temperature is controlled to be 720±20℃, the holding time is 24~28h, and then air-cooled to room temperature to finally obtain a high-temperature alloy composite plate.

[0047] The high temperature alloy composite plate and the preparation method thereof of the present invention are further introduced below with reference to specific examples.

[0048] Example

[0049] In Examples 1 to 9, according to the high-temperature alloy composite plate of the present invention, a high-temperature alloy composite plate of GH4169+NS1102 with five thickness specifications of 3mm+10mm, 3mm+20mm, 3mm+50mm, 5mm+20mm, and 5mm+50mm for the composite layer+base layer is designed, and the preparation method of the present invention is adopted for preparation. The specific parameters are shown in Table 1, and the properties of the high-temperature alloy composite plate are shown in Table 2;

[0050] Comparative Example

[0051] Comparative Examples 1 to 3 respectively use NS1102 pure material, NS1102 surfacing, and GH4169+NS1102 alloy, and then heat and solution treat (1020°C, keep warm for 2 hours, air cool), without aging heat treatment. As the control group, the specific parameters in the preparation process are shown in Table 1, and the properties of the finally prepared plate are shown in Table 2.

[0052] Table 1 Comparison of parameters during the preparation of the embodiments and comparative examples

[0053] Material Finished product specifications Heating temperature and time Solution treatment Aging heat treatment Example 1 GH4169+NS1102 3+10 1100℃*300min 1020℃*2h 720℃*24h Example 2 GH4169+NS1102 3+10 1140℃*300min 1020℃*2h 720℃*24h Example 3 GH4169+NS1102 3+10 1100℃*300min 1010℃*2.5h 700℃*28h Example 4 GH4169+NS1102 3+10 1140℃*300min 1010℃*2.5h 700℃*28h Example 5 GH4169+NS1102 3+20 1100℃*450min 1020℃*2h 720℃*24h Example 6 GH4169+NS1102 3+20 1140℃*450min 1020℃*2h 720℃*24h Example 7 GH4169+NS1102 3+50 1140℃*450min 1020℃*2h 720℃*24h Example 8 GH4169+NS1102 5+20 1140℃*450min 1020℃*2h 720℃*24h Example 9 GH4169+NS1102 5+50 1140℃*450min 1020℃*2h 720℃*24h Comparative Example 1 GH4169+NS1102 10+3 1140℃*300min 1020℃*2h / Comparative Example 2 N01102 10 1200℃*300min 1020℃*2h / Comparative Example 3 N01102 cladding NiCrMo-3 10+3 1180℃*300min 1020℃*2h /

[0054] Table 2 Comparison of mechanical properties

[0055]

[0056] The wear resistance of the material is mainly reflected in the tensile strength and hardness of the material. By comparing the tensile strength or hardness, the wear resistance of the material can be judged. As shown in Table 2, the high-temperature alloy composite plates produced by Examples 1-9, 5 different thickness specification combinations can have a bonding strength of 390MPa and above, proving that the preparation method adopted by the present invention is very strong in manufacturing high-temperature alloy composite plates, and is suitable for different thickness combinations of composite layers and base layers; at the same time, it can be found that the high-temperature alloy composite plates prepared by heating the composite slab at a high temperature have a higher bonding strength than those prepared by heating at a low temperature. Through the solid solution + aging heat treatment of the present invention, the tensile strength of the GH4169 alloy composite layer exceeds 1400MPa, and the hardness HB exceeds 430. It has very high tensile strength and surface hardness, and has a tensile strength of nearly 1200MPa at 600°C, and has good wear resistance at high temperatures. It can be seen from Table 1 and Comparative Example 1 in Table 2 that if solution treatment is adopted, the tensile strength of the GH4169 composite layer is only 860MPa, the hardness HB is only 245, and the high-temperature tensile strength at 600°C is only 702MPa, which does not have high-temperature wear resistance. In Comparative Example 3, the material nickel-based alloy NiCrMo-3 and the NS1102 alloy are surfacing. Although the bonding strength is equivalent, the room temperature strength of the cladding layer is only 870MPa, the hardness HB is only 250, and the high-temperature strength is only 760MPa, and the wear resistance is also relatively poor. In Comparative Example 2, the pure NS1102 alloy has a room temperature tensile strength of 560MPa, a hardness HB of only 160MPa, and a high-temperature tensile strength of only 450MPa, and the wear resistance is very poor. By comparison, it is proved that the GH4169+NS1102 composite plate of the present invention can solve the high-temperature wear resistance problem of the polysilicon reactor, and the effect is very obvious.

[0057] This embodiment. Those skilled in the art should recognize that the above embodiments are only used to illustrate the present invention, and are not intended to limit the present invention. As long as they are within the spirit of the present invention, any changes or modifications to the above embodiments will fall within the scope of the claims of the present invention.

Claims

1. A high-temperature alloy composite plate having high-temperature fluid erosion resistance, characterized in that: It comprises a NS1102 alloy base layer and a GH4169 alloy composite layer arranged on the NS1102 alloy base layer; the thickness ratio of the NS1102 alloy base layer to the GH4169 alloy composite layer is greater than 4:1, The high temperature alloy composite plate is prepared by the following preparation method, comprising the steps of: S1, blank preparation, selecting NS1102 alloy slab and GH4169 alloy slab, and cleaning the bonding surface of the NS1102 alloy slab and the GH4169 alloy slab; S2, welding, welding the NS1102 alloy slab and the GH4169 alloy slab to obtain a composite slab, leaving pores at the ends of the composite slab, welding a vacuum nozzle on the pores, and then performing a vacuum treatment; S3, rolling, heating and keeping the composite slab after the treatment in step S2, and then rolling the composite slab for multiple passes; S4, heat treatment, the rolled composite slab is subjected to solution treatment, air cooling, and then subjected to aging heat treatment and air cooling to room temperature. In step S3, the heating temperature of the composite slab is 1100-1140° C., and the holding time t satisfies the following formula: t = k × h; In the formula, t is the holding time, in min; k is a multiple, and the range of k is 2 to 4; h is the thickness of the composite slab, in mm, In the step S4: During the solution treatment, the solution temperature is 1020±10°C and the holding time is 2±0.5h; During the aging heat treatment process, the aging treatment temperature is 720±20° C., the holding time is 24 to 28 hours, and the bonding strength between the NS1102 alloy base layer and the GH4169 alloy composite layer is greater than 300 MPa.

2. The high temperature alloy composite plate according to claim 1, characterized in that: The thickness of the NS1102 alloy base layer is 8 to 50 mm, and the thickness of the GH4169 alloy composite layer is 2 to 4 mm.

3. The high temperature alloy composite plate according to claim 1, characterized in that: The GH4169 alloy composite layer of the high temperature alloy composite plate has a tensile strength of ≥1400MPa and a hardness HB of ≥430 at room temperature; The GH4169 alloy composite layer of the high-temperature alloy composite plate has a tensile strength of ≥1160 MPa at 600°C.

4. A method for preparing a high temperature alloy composite plate according to any one of claims 1 to 3, characterized in that: The following steps are involved: S1, blank preparation, selecting NS1102 alloy slab and GH4169 alloy slab, and cleaning the bonding surface of the NS1102 alloy slab and the GH4169 alloy slab; S2, welding, welding the NS1102 alloy slab and the GH4169 alloy slab to obtain a composite slab, leaving pores at the ends of the composite slab, welding a vacuum nozzle on the pores, and then performing a vacuum treatment; S3, rolling, heating and keeping the composite slab after the treatment in step S2, and then rolling the composite slab for multiple passes; S4, heat treatment, the rolled composite slab is subjected to solution treatment, air cooling, and then subjected to aging heat treatment and air cooling to room temperature. In step S3, the heating temperature of the composite slab is 1100-1140° C., and the holding time t satisfies the following formula: t = k × h; In the formula, t is the holding time, in min; k is a multiple, and the range of k is 2 to 4; h is the thickness of the composite slab, in mm, In the step S4: During the solution treatment, the solution temperature is 1020±10°C and the holding time is 2±0.5h; During the aging heat treatment process, the aging treatment temperature is 720±20° C. and the insulation time is 24 to 28 hours.

5. The method for preparing a high temperature alloy composite plate according to claim 4, characterized in that: In step S1: The thickness of the NS1102 alloy slab is more than 3 times the thickness of the NS1102 alloy base layer; the thickness of the GH4169 alloy slab is more than 3 times the thickness of the GH4169 alloy composite layer; and / or The surface cleaning is milling or grinding.

6. The method for preparing a high temperature alloy composite plate according to claim 4, characterized in that: In the step S2, after the vacuum treatment, the vacuum degree of the bonding surface of the composite slab is less than 0.1 Pa.

7. The method for preparing a high temperature alloy composite plate according to claim 4, characterized in that: In the step S3, during the multi-pass rolling process, the reduction ratio of the first two passes is 5%.

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