A method for preparing titanium-based wear-resistant composite material by submerged arc welding

Abstract

The invention discloses a method for preparing a titanium-based wear-resistant composite material by submerged arc welding, and relates to the technical field of wear-resistant materials. The invention uses a titanium carbide alloy with low specific gravity, high strength, high heat resistance and corrosion resistance, and adopts a submerged arc surfacing process. In a nitrogen environment, the welding slag is firmly adhered to the weld bead, and the uneven surface of the titanium carbide is avoided. Nitrogen is used as an interstitial atom to alloy with some metal elements, thereby improving the resistance to welding thermal cracks, abrasion resistance and high-temperature stability. At the same time, under the action of a longitudinal auxiliary magnetic field, the magnetic induction line is parallel to the axis of the welding arc. During the welding process, the shape of the welding arc will be accompanied by periodic expansion and contraction, which promotes a certain degree of refinement of the organization of the fusion zone, thereby extending its service life. Then, a tempering treatment is performed to produce a secondary hardening effect, thereby improving the thermal stability and corrosion resistance of the matrix.

Description

Technical Field

[0001] The invention relates to the technical field of wear-resistant materials, in particular to a method for preparing a titanium-based wear-resistant composite material by submerged arc welding. Background Art

[0002] Titanium carbide alloy has the characteristics of small specific gravity, high strength, high heat resistance, and corrosion resistance. In the mining field, titanium carbide rods are usually embedded in severely worn parts, or chromium carbide and tungsten carbide wear-resistant composite plates are used, but the results are often unsatisfactory. There are titanium carbide open arc surfacing wear-resistant plates abroad, but the surface is very bumpy and there are many pores on the surface of the wear-resistant layer, which is easy to hang when used. Although it has excellent wear resistance, it is not highly recognized by users. The production of titanium carbide materials requires vacuum conditions to be completed, because titanium carbide is very sensitive to oxygen when melted. Therefore, wear-resistant composite plate manufacturers at home and abroad cannot produce mass-produced titanium carbide wear-resistant composite plates with smooth surfaces.

[0003] According to the survey information feedback from John McCraken, a famous Australian wear-resistant expert; the world's well-known wear-resistant composite plate manufacturers usually produce chromium carbide, tungsten carbide, niobium carbide and mixed hard wear-resistant plates, and no company can produce titanium carbide wear-resistant composite plates; and the same content of tungsten carbide, niobium carbide, titanium carbide, the former has a higher hardness than titanium carbide, and the price of raw materials is much higher than titanium carbide, but its wear resistance is not as good as titanium carbide. Therefore, titanium carbide bars and plates are common in the market, rather than tungsten carbide and niobium carbide bars and plates. It can be seen that the market recognizes its cost-effectiveness.

[0004] In view of the fact that a large amount of oxygen will be absorbed during the process of depositing titanium carbide wear-resistant layer, the surface of titanium carbide will be uneven. At present, there is no flux in the world for depositing titanium carbide. In order to break through this technical bottleneck, our engineers worked together with foreign experts to develop a unique wear-resistant layer formula and flux formula after 6 years and hundreds of attempts. Summary of the invention

[0005] The purpose of the present invention is to provide a method for preparing a titanium-based wear-resistant composite material by submerged arc welding, so as to solve the problems existing in the prior art.

[0006] In order to solve the above technical problems, the present invention provides the following technical solution: a method for preparing a titanium-based wear-resistant composite material by submerged arc welding, comprising the following preparation steps:

[0007] (1) sieving high chromium (Cr68), titanium (Ti70), high manganese powder (Mn75), ferrosilicon powder (Si75), ferroboron powder (B18), and ferroniobium powder (NB65) respectively, mixing and stirring to obtain a composite powder;

[0008] (2) Laying H08A solid welding wire and composite powder on the path of the weld to be welded, performing submerged arc welding under the action of nitrogen atmosphere and magnetic field and with the assistance of flux, and cooling by water spraying to obtain a titanium-based wear-resistant composite material;

[0009] (3) The titanium-based wear-resistant composite material is cut and leveled, and then tempered at 500-600°C for 1 hour.

[0010] Furthermore, the mesh size of the sieving in step (1) is 30-50 meshes.

[0011] Furthermore, in step (1), the stirring rate is 100-200 rpm, and the time is 80-120 min.

[0012] Furthermore, the mass formula of the composite powder in step (1) is: high chromium (Cr68) 93.75%, titanium (Ti70) 4%, high manganese powder (Mn75) 0.75%, ferrosilicon powder (Si75) 0.25%, ferroboron powder (B18) 0.25%, and ferroniobium powder (NB65) 1%.

[0013] Furthermore, the specification of the H08A solid welding wire in step (2) is Φ2.5 mm.

[0014] Furthermore, in step (2), the mass ratio of the H08A solid welding wire to the mixed powder is 1:1.6-2.

[0015] Furthermore, the mass ratio of the H08A solid welding wire to the mixed powder is adjusted according to the thickness of the wear-resistant layer.

[0016] Furthermore, the flux preparation method of step (2) is as follows: silicon oxide, manganese oxide and aluminum oxide are fully mixed in a mass ratio of 35:5:30 to obtain a mixed powder, and the mixed powder is mixed with SJ602 flux in a mass ratio of 1:1 to obtain.

[0017] Furthermore, the magnetic field in step (2) is a longitudinal magnetic field with an intensity of 0.01 T, so that the magnetic induction lines are parallel to the welding arc axis.

[0018] Furthermore, the process parameters of step (2) are: current 400-430A, voltage 35-40V, surfacing speed 260mm / min, width 26mm, and wire feeding rate 80g / min.

[0019] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0020] The present invention utilizes titanium carbide alloy with small specific gravity, high strength, high heat resistance and corrosion resistance, adopts submerged arc cladding process, and makes welding slag firmly adhere to the weld in a nitrogen environment, and avoids causing unevenness on the surface of titanium carbide. Nitrogen, as an interstitial atom, is alloyed with part of metal elements to form carbonitride, thereby improving the resistance to welding thermal cracks, abrasion resistance and high-temperature stability. At the same time, under the action of the longitudinal auxiliary magnetic field, the magnetic induction line is parallel to the axis of the welding arc. During the welding process, the charged particles moving in the arc perform spiral motion, and the shape of the welding arc is accompanied by periodic expansion and contraction, which promotes a certain degree of refinement of the organization of the fusion zone, which is beneficial to improving the mechanical properties of the welded joint, thereby extending its service life. Then, tempering treatment is performed to disperse and precipitate fine carbonitrides in rod-shaped and spherical shapes, produce a secondary hardening effect, and inhibit the formation of chromium-rich phases, so that the matrix achieves good thermal stability and corrosion resistance. DETAILED DESCRIPTION

[0021] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0022] In order to more clearly illustrate the method provided by the present invention, the following examples are used to describe in detail the various index testing methods of the titanium-based wear-resistant composite material prepared by submerged arc welding in the following examples are as follows:

[0023] Thermal stability: Take the embodiment and comparative example of the same size, heat treat them at 200°C for 500h, and then test their tensile strength.

[0024] Corrosion resistance: The intergranular corrosion performance of the embodiment and the comparative example of the same size was tested by G28 A method.

[0025] Example 1; (1) High chromium (Cr68), titanium (Ti70), high manganese powder (Mn75), ferrosilicon powder (Si75), ferroboron powder (B18), and ferroniobium powder (NB65) are sieved through a 40-mesh sieve, mixed, and stirred at 150 rpm for 100 min to obtain a composite powder; the composite powder has a mass formula of: high chromium (Cr68) 93.75%, titanium (Ti70) 4%, high manganese powder (Mn75) 0.75%, ferrosilicon powder (Si75) 0.25%, ferroboron powder (B18) 0.25%, and ferroniobium powder (NB65) 1%;

[0026] (2) Silicon oxide, manganese oxide and aluminum oxide are fully mixed in a mass ratio of 35:5:30 to obtain a mixed powder, and the mixed powder is mixed with SJ602 flux in a mass ratio of 1:1 to obtain flux; a H08A solid welding wire with a specification of Φ2.5 mm and the composite powder are laid on the path of the weld to be welded, and submerged arc welding is performed under a nitrogen atmosphere and a longitudinal magnetic field with an intensity of 0.01 T, so that the magnetic induction line is parallel to the axis of the welding arc, and with the assistance of the flux, the process parameters are: current 415A, voltage 37V, surfacing speed 260mm / min, width 26mm, wire feeding rate 80g / min, and water spray cooling to obtain a titanium-based wear-resistant composite material; the mass ratio of the H08A solid welding wire with a specification of Φ2.5 mm to the mixed powder is 1:1.8;

[0027] (3) The titanium-based wear-resistant composite material is cut and leveled, and then tempered at 550°C and kept warm for 1 hour to obtain the result.

[0028] Comparative Example 1: The difference between Comparative Example 1 and Example 1 is that step (2) is different. Step (2) is changed to: silicon oxide, manganese oxide and aluminum oxide are fully mixed in a mass ratio of 35:5:30 to obtain a mixed powder, and the mixed powder is mixed with SJ602 flux in a mass ratio of 1:1 to obtain flux; a H08A solid welding wire with a specification of Φ2.5 mm and the composite powder are laid on the path of the weld to be welded, and under the action of a longitudinal magnetic field with an intensity of 0.01 T, the magnetic induction line is made parallel to the axis of the welding arc, and submerged arc welding is performed with the assistance of the flux, and its process parameters are: current 415A, voltage 37V, surfacing speed 260mm / min, width 26mm, wire feeding rate 80g / min, and water spray cooling is performed to obtain a titanium-based wear-resistant composite material; the mass ratio of the H08A solid welding wire with a specification of Φ2.5 mm to the mixed powder is 1:1.8; the remaining steps are the same as in Example 1.

[0029] Comparative Example 2: The difference between Comparative Example 2 and Example 1 is that step (2) is different. Step (2) is changed to: silicon oxide, manganese oxide and aluminum oxide are fully mixed in a mass ratio of 35:5:30 to obtain a mixed powder, and the mixed powder is mixed with SJ602 flux in a mass ratio of 1:1 to obtain flux; a H08A solid welding wire with a specification of Φ2.5 mm and the composite powder are laid on the path of the weld to be welded, and submerged arc welding is performed in a nitrogen atmosphere and with the assistance of flux. The process parameters are: current 415A, voltage 37V, surfacing speed 260mm / min, width 26mm, wire feeding rate 80g / min, and water spray cooling to obtain a titanium-based wear-resistant composite material; the mass ratio of the H08A solid welding wire with a specification of Φ2.5 mm to the mixed powder is 1:1.8; the remaining steps are the same as Example 1.

[0030] Comparative Example 3: The difference between Comparative Example 3 and Example 1 is that step (3) is different. Step (3) is changed to: cutting and leveling the titanium-based wear-resistant composite material to obtain; the remaining steps are the same as Example 1.

[0031] Table 1 Comparative data of abrasive wear test of Example 1 and existing products

[0032]

[0033] It can be seen from Table 1 that, compared with HARDOX450, the wear resistance of Example 1 is improved by 4.9 times; compared with XGG1800 (6+6), the wear resistance of Example 1 is improved by 33.7%; compared with XGG2000 (6+7), the wear resistance of Example 1 is improved by 28.2%; compared with XGG5000 (6+7), the wear resistance of Example 1 is improved by 22.7%.

[0034] Table 2

[0035]

[0036] From the comparison of the experimental data of the embodiment and the comparative example in Table 2, it can be found that the present invention utilizes a titanium carbide alloy with a small specific gravity, high strength, high heat resistance and corrosion resistance, and adopts a submerged arc surfacing process. In a nitrogen environment, the welding slag is firmly adhered to the weld bead, and the uneven surface of the titanium carbide is avoided. Nitrogen is used as an interstitial atom to alloy with some metal elements, thereby improving the resistance to welding hot cracks, abrasion resistance and high-temperature stability. At the same time, under the action of the longitudinal auxiliary magnetic field, the magnetic induction line is parallel to the axis of the welding arc. During the welding process, the morphology of the welding arc will be accompanied by periodic expansion and contraction, which promotes a certain degree of refinement of the organization of the fusion zone, which is beneficial to improve the mechanical properties of the welded joint, thereby extending its service life. Then, tempering treatment is performed to produce a secondary hardening effect, so that the matrix achieves good thermal stability and corrosion resistance.

[0037] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations within the meaning and scope of the equivalent elements of the claims be included in the invention. Any marking in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A method for preparing a titanium-based wear-resistant composite material using submerged arc welding, characterized in that: The method comprises the following preparation steps: (1) High chromium: Cr68, titanium: Ti70, high manganese powder: Mn75, ferrosilicon powder: Si75, ferroboron powder: B18, and ferroniobium powder: NB65 are sieved separately, mixed and stirred to obtain a composite powder; the mass formula of the composite powder is: high chromium: Cr68 is 93.75%, titanium: Ti70 is 4%, high manganese powder: Mn75 is 0.75%, ferrosilicon powder: Si75 is 0.25%, ferroboron powder: B18 is 0.25%, and ferroniobium powder: NB65 is 1%; (2) Silicon oxide, manganese oxide and aluminum oxide are fully mixed in a mass ratio of 35:5:30 to obtain a mixed powder, and the mixed powder is mixed with SJ602 flux in a mass ratio of 1:1 to obtain flux; H08A solid welding wire and the composite powder are laid on the path of the weld to be welded, and submerged arc welding is performed under the action of nitrogen atmosphere and magnetic field and with the assistance of flux. The process parameters are: current 400~430A, voltage 35~40V, surfacing speed 260mm / min, width 26mm, wire feeding rate 80g / min, and water spray cooling is performed to obtain a titanium-based wear-resistant composite material; (3) The titanium-based wear-resistant composite material is cut and leveled, and then tempered at 500-600°C for 1 hour.

2. The method for preparing a titanium-based wear-resistant composite material by submerged arc welding according to claim 1, characterized in that: The mesh size of the sieving in step (1) is 30 to 50 meshes.

3. The method for preparing a titanium-based wear-resistant composite material by submerged arc welding according to claim 1, characterized in that: The stirring rate of step (1) is 100-200 rpm, and the time is 80-120 min.

4. The method for preparing a titanium-based wear-resistant composite material by submerged arc welding according to claim 1, characterized in that: The specification of the H08A solid welding wire in step (2) is Φ2.5mm.

5. The method for preparing a titanium-based wear-resistant composite material by submerged arc welding according to claim 1, characterized in that: In step (2), the mass ratio of the H08A solid welding wire to the composite powder is 1:1.6-2.

6. The method for preparing a titanium-based wear-resistant composite material by submerged arc welding according to claim 5, characterized in that: The mass ratio of the H08A solid welding wire to the composite powder is adjusted according to the thickness of the wear-resistant layer.

7. The method for preparing a titanium-based wear-resistant composite material by submerged arc welding according to claim 1, characterized in that: The magnetic field in step (2) is a longitudinal magnetic field with an intensity of 0.01 T, so that the magnetic induction lines are parallel to the axis of the welding arc.

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