Titanium-steel composite structure track shoe and preparation method thereof

Abstract

The invention relates to a titanium-steel composite structure track shoe. The titanium-steel composite structure forged track shoe comprises a titanium alloy plate and an alloy steel plate. Wherein the titanium alloy plate is a base body, and the alloy steel plate is arranged on the lower surface of the titanium alloy plate and makes contact with the ground. The titanium-steel composite structure track shoe can make up the defects of a track shoe made of a single metal material, the weight of the track shoe can be reduced, and the track shoe can obtain good comprehensive mechanical property, durability and low cost.

Description

Technical Field

[0001] The present application relates to the technical field of track plate manufacturing, and in particular to a track plate with a titanium-steel composite structure and a preparation method thereof. Background Art

[0002] At present, track plates for special vehicles are mainly made of single metal materials through casting or die forging. Commonly used single metal materials are alloy steel, high-strength aluminum alloy, and titanium alloy. Alloy steel can meet the comprehensive mechanical performance requirements of track plates, such as high strength, high hardness, high wear resistance, and impact resistance, but alloy steel track plates are heavy; high-strength aluminum alloys and titanium alloys can meet the requirements of weight reduction for track plates of special vehicles, but aluminum alloys and titanium alloys have relatively low strength and poor wear resistance, and cannot meet the requirements of high stiffness, wear resistance, and high durability of track plates. In addition, the cost of alloy steel is higher than that of alloy steel. In summary, the use of single metal materials often cannot meet both the high mechanical performance requirements of track plates and the lightweight, high durability, and low cost requirements of track plates. Summary of the invention

[0003] The present application provides a titanium-steel composite structure track plate and a preparation method thereof, so as to solve the technical problem that it is difficult to simultaneously take into account both the lightweight effect and the mechanical properties of the existing track plates.

[0004] In a first aspect, the present application provides a titanium-steel composite structure track plate, wherein the titanium-steel composite structure forged track plate comprises a titanium alloy plate and an alloy steel plate; wherein the titanium alloy plate is a substrate, and the alloy steel plate is arranged on the lower surface of the titanium alloy plate and contacts the ground.

[0005] Optionally, the titanium alloy plate is a TC4 titanium alloy plate.

[0006] Optionally, the alloy steel plate includes one of the following: 42CrMo alloy steel plate and 38CrSi alloy steel plate.

[0007] In a second aspect, the present application provides a method for preparing a titanium-steel composite structure track shoe, which is used to prepare the titanium-steel composite structure track shoe according to any embodiment of the first aspect, and the method comprises:

[0008] Heating titanium alloy plates and alloy steel plates;

[0009] Under vacuum protection or inert gas protection, the heated titanium alloy plate and the heated alloy steel plate are stacked and forged to obtain a semi-finished titanium-steel composite structure track plate;

[0010] The semi-finished titanium-steel composite structure track shoe is heat treated to obtain the titanium-steel composite structure track shoe.

[0011] Optionally, the forging process parameters include: a start forging temperature of 890-920° C., a final forging temperature of 810-850° C., and a forging ratio of ≥40%.

[0012] Optionally, the heating process parameters include: heating temperature 900-920° C., heating and holding time (1T-1.5T) min / mm, and T represents the thickness of the titanium alloy plate.

[0013] Optionally, the heat treatment of the semi-finished titanium-steel composite structure track shoe to obtain the titanium-steel composite structure track shoe comprises:

[0014] The semi-finished titanium-steel composite structure track shoe is heat treated to obtain a titanium-steel composite structure track shoe; wherein the heat treatment includes solution treatment and tempering treatment.

[0015] Optionally, the process parameters of the solution treatment include: a solution temperature of 900-920° C., a solution holding time of (2t-2.2t) min / mm, and t represents the thickness of the semi-finished titanium-steel composite structure track shoe.

[0016] Optionally, the process parameters of the tempering treatment include: a tempering temperature of 400-500° C., a tempering holding time of (2.5t-3t) min / mm, and t represents the thickness of the semi-finished titanium-steel composite structure track shoe.

[0017] Optionally, the semi-finished titanium-steel composite structure track shoe is subjected to heat treatment to obtain a titanium-steel composite structure track shoe, and then the process further includes:

[0018] The alloy steel plate of the titanium-steel composite structure track shoe is post-processed, and the post-processing includes one of the following: surface quenching, carburizing and nitriding.

[0019] The above technical solution provided by the embodiment of the present application has the following advantages compared with the prior art:

[0020] The titanium-steel composite structure track plate provided in the embodiment of the present application can make up for the shortcomings of the track plate made of single metal materials, which can not only reduce the weight of the track plate, but also enable the track plate to obtain good comprehensive mechanical properties, durability and low cost. In addition, using near-net-shape plates as raw materials can reduce the process costs and losses caused by forging square billets when round bars are used as raw materials; using plates as raw materials can further meet the requirements of the force direction of the track plate by utilizing the characteristics of the longitudinal (rolling direction) and transverse (perpendicular to the rolling direction) mechanical properties of the plates, and improve the strength and rigidity of the track plate; the shape adaptability is good, and it can adapt to the design requirements of different track plate shapes such as with ground bars, and the titanium-steel bonding interface can achieve good metallurgical bonding with high bonding strength. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0022] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0023] Figure 1 A schematic diagram of a titanium-steel composite track shoe provided in an embodiment of the present application;

[0024] Figure 2 A schematic flow chart of a method for preparing a titanium-steel composite structure track shoe provided in an embodiment of the present application. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0026] Various embodiments of the present application may be presented in the form of a range; it should be understood that the description in the form of a range is only for convenience and brevity, and should not be understood as a rigid limitation on the scope of the present application; therefore, the range description should be considered to have specifically disclosed all possible sub-ranges and single numerical values ​​within the range. For example, the range description from 1 to 6 should be considered to have specifically disclosed sub-ranges, such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., as well as single numbers within the range, such as 1, 2, 3, 4, 5 and 6, which apply regardless of the range. In addition, whenever a numerical range is indicated herein, it is meant to include any cited number (fractional or integer) within the indicated range.

[0027] In the present application, in the absence of any contrary description, the directional words used, such as "upper" and "lower", are specifically the directions of the drawings in the accompanying drawings. In addition, in the description of the present specification, the terms "including", "comprising", etc. refer to "including but not limited to". In this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. In this article, "and / or" describes the association relationship of the associated objects, indicating that there may be three relationships, for example, A and / or B, which can represent: A exists alone, A and B exist at the same time, and B exists alone. Wherein A, B can be singular or plural. In this article, "at least one" refers to one or more, and "plural" refers to two or more. "At least one", "at least one of the following" or similar expressions refer to any combination of these items, including any combination of singular or plural items. For example, "at least one of a, b, or c", or "at least one of a, b and c", can both mean: a, b, c, ab (i.e. a and b), ac, bc or abc, where a, b, c can be single or plural, respectively.

[0028] Unless otherwise specified, various raw materials, reagents, instruments and equipment used in this application can be purchased from the market or prepared by existing methods.

[0029] In the first aspect, the present application provides a titanium-steel composite structure track plate, wherein the titanium-steel composite structure forged track plate comprises a titanium alloy plate and an alloy steel plate; wherein the titanium alloy plate is a substrate, and the alloy steel plate is arranged on the lower surface of the titanium alloy plate and contacts the ground, see Figure 1 Schematic diagram of the titanium-steel composite structure track shoe shown.

[0030] In some embodiments, the titanium alloy plate is a TC4 titanium alloy plate.

[0031] In the embodiment of the present application, the positive effect of selecting TC4 titanium alloy plate is that the TC4 titanium alloy plate has high strength and toughness after reasonable heat treatment, which can ensure the mechanical property requirements of the track plate and play a good lightweight effect as the track plate substrate.

[0032] In some embodiments, the alloy steel plate includes one of the following: a 42CrMo alloy steel plate and a 38CrSi alloy steel plate.

[0033] In the embodiment of the present application, one of 42CrMo alloy steel plate and 38CrSi alloy steel plate is selected as the alloy steel plate. The positive effects are: the above two alloy steels have excellent hot working properties and excellent strength and toughness after heat treatment.

[0034] In the second aspect, the present application provides a method for preparing a titanium-steel composite track shoe, see Figure 2 , used to prepare the titanium-steel composite structure track shoe according to any one of the embodiments of the first aspect, the method comprising:

[0035] S1. heating the titanium alloy plate and the alloy steel plate;

[0036] In the embodiment of the present application, before step S1, the steps include: calculating the required length, width and thickness of the TC4 titanium alloy plate material and the required length, width and thickness of the 42CrMo or 38CrSi alloy steel plate according to the track shoe size requirements; and removing the iron oxide and oil stains on the surface of the above raw materials by machining and chemical methods.

[0037] In some embodiments, the heating process parameters include: heating temperature 900-920° C., heating and holding time (1T-1.5T) min / mm, and T represents the thickness of the titanium alloy plate.

[0038] In the embodiment of the present application, the positive effect of controlling the heating temperature to 900-920°C and the heating and holding time to (1T-1.5T) min / mm is: this heating temperature can take into account the thermophysical parameters of the titanium alloy and the alloy steel and make both have excellent thermoplasticity, meet the subsequent forging processing requirements while not coarsening the titanium alloy and alloy steel grains, and ensure the strength and toughness of the finished track plate. Specifically, the heating temperature can be 900°C, 905°C, 910°C, 915°C, 920°C, etc.; the heating time can be 1T, 1.1T, 1.2T, 1.3T, 1.4T, 1.5T, etc.

[0039] S2. Under vacuum protection or inert gas protection, the heated titanium alloy plate and the heated alloy steel plate are stacked and forged to obtain a semi-finished titanium-steel composite structure track plate; the semi-finished product can be roughly machined as needed;

[0040] In some embodiments, the forging process parameters include: a start forging temperature of 890-920° C., a final forging temperature of 810-850° C., and a forging ratio of ≥40%.

[0041] In the embodiment of the present application, the positive effect of controlling the start forging temperature to 890-920°C is that it is conducive to the control of the strength and toughness of titanium alloys and alloy steels and reduces the difficulty of forging. If the start forging temperature is too low, the thermoplasticity of the titanium alloy and alloy steel will be reduced to a certain extent, increasing the equipment load and the difficulty of forging deformation. Specifically, the start forging temperature can be 890°C, 895°C, 900°C, 905°C, 910°C, 915°C, 920°C, etc. The positive effect of controlling the final forging temperature to 810-850°C is that it is conducive to the control of the strength and toughness of titanium alloys and alloy steels and reduces the difficulty of forging. If the final forging temperature is too high, it will make the titanium alloy and alloy steel grains grow easily to a certain extent, which is not conducive to the subsequent strength and toughness of titanium alloys and alloy steels; if the final forging temperature is too low, it will increase the forging load to a certain extent and have an adverse effect on the equipment. Specifically, the final forging temperature can be 810°C, 820°C, 830°C, 840°C, 850°C, etc. The positive effect of controlling the forging ratio ≥ 40% is that it can ensure good interface bonding and refine the titanium alloy and alloy steel structure, which is beneficial to improving the overall mechanical properties of the track plate. If the forging ratio is too small, the interface bonding force will be reduced to a certain extent, which is not conducive to the control of the mechanical properties of the track plate. Specifically, the forging ratio can be 40%, 42%, 43%, etc. The forging is carried out in a forging die with vacuum protection or inert gas protection conditions, and the die forging groove can be pre-made according to the shape and size requirements of the track plate.

[0042] Another way to implement step S2 is to stack the TC4 titanium alloy sheet material with the 42CrMo or 38CrSi alloy steel sheet material with the appropriate size, weld and seal the four sides under vacuum conditions or evacuate the interface between the two raw materials to ensure that the vacuum degree between the interfaces of the two raw material sheets reaches 10 -3 Pa, there is no need for a forging die with vacuum protection or inert gas protection conditions.

[0043] S3. Heat-treating the semi-finished titanium-steel composite structure track shoe to obtain a titanium-steel composite structure track shoe.

[0044] After step S3 is completed, the track shoe is cooled to room temperature after heat preservation, and fine machining is performed as needed to obtain a finished track shoe.

[0045] In some embodiments, the heat treatment of the semi-finished titanium-steel composite structure track shoe to obtain the titanium-steel composite structure track shoe comprises:

[0046] The semi-finished titanium-steel composite structure track shoe is heat treated to obtain a titanium-steel composite structure track shoe; wherein the heat treatment includes solution treatment and tempering treatment.

[0047] In some embodiments, the process parameters of the solution treatment include: a solution temperature of 900-920° C., a solution holding time of (2t-2.2t) min / mm, and t represents the thickness of the semi-finished titanium-steel composite structure track shoe.

[0048] In the embodiment of the present application, the solution temperature is controlled to be 900-920°C, and the solution holding time is (2t-2.2t)min / mm, which has the positive effect of ensuring the mechanical properties of the track shoe. Specifically, the solution temperature can be 900°C, 905°C, 910°C, 915°C, 920°C, etc.; the solution holding time can be 2t, 2.1t, 2.2t, etc.

[0049] In some embodiments, the process parameters of the tempering treatment include: a tempering temperature of 400-500° C., a tempering holding time of (2.5t-3t) min / mm, and t represents the thickness of the semi-finished titanium-steel composite structure track shoe.

[0050] In the embodiment of the present application, the tempering temperature is controlled to be 400-500°C, and the tempering holding time is (2.5t-3t)min / mm. The positive effect is: by combining the solution treatment with the tempering treatment, the titanium alloy and the alloy steel are fully guaranteed to obtain good strength, toughness and hardness, thereby ensuring the application performance of the track plate. Specifically, the tempering temperature can be 400°C, 420°C, 440°C, 460°C, 480°C, 500°C, etc.; the tempering holding time can be 2.5t, 2.6t, 2.7t, 2.8t, 2.9t, 3t, etc.

[0051] In some embodiments, the step of heat treating the semi-finished titanium-steel composite structure track shoe to obtain the titanium-steel composite structure track shoe further comprises:

[0052] The alloy steel plate of the titanium-steel composite structure track shoe is post-processed, and the post-processing includes one of the following: surface quenching, carburizing and nitriding.

[0053] Post-processing of the medium alloy steel plate portion of the titanium-steel composite structure track shoe has the positive effect of further improving its hardness and wear resistance.

[0054] The track plate substrate is made of high-strength titanium alloy, and the high-strength alloy steel is the part connected to the substrate and in contact with the ground. The composite track plate is made of titanium alloy plate and alloy steel plate as raw materials, and is forged by stacking raw materials and reasonably controlling forging temperature and forging ratio under vacuum conditions or inert gas protection conditions. The composite track plate overcomes the shortcomings of single metal track plates and has a simple manufacturing process, good shape adaptability, and obvious weight reduction effect. The combination of the two materials has high strength, which can effectively ensure the durability and life of the track plate.

[0055] The preparation method of the titanium-steel composite structure track plate is implemented based on the composition of the above-mentioned titanium-steel composite structure track. The composition of the titanium-steel composite structure track can refer to the above-mentioned embodiment. Since the preparation method of the titanium-steel composite structure track plate adopts part or all of the technical solutions of the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here one by one.

[0056] The present application will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are intended only to illustrate the present application and are not intended to limit the scope of the present application. The experimental methods for which specific conditions are not specified in the following examples are usually measured according to national standards. If there is no corresponding national standard, then the conditions recommended by the manufacturer are followed.

[0057] The present application provides a method for preparing a titanium-steel composite track shoe, the method comprising:

[0058] S11, heating the titanium alloy plate and the alloy steel plate;

[0059] S21. Under vacuum protection or inert gas protection, the heated titanium alloy plate and the heated alloy steel plate are stacked and forged to obtain a semi-finished titanium-steel composite structure track plate;

[0060] S31, heat-treating the semi-finished titanium-steel composite structure track shoe to obtain a titanium-steel composite structure track shoe. For specific process parameters, please refer to Example 1-2.

[0061] Example 1

[0062] TC4 titanium alloy plate is selected as raw material, and the chemical composition of TC4 meets the composition requirements of GB / T3621-1994. 42CrMo alloy steel plate is selected as raw material, and the composition of 42CrMo alloy steel meets the composition requirements of GB / T3077-2015. The above titanium alloy plate and alloy steel are used as raw materials to manufacture split titanium-steel composite structure forged crawler plates.

[0063] 1) The dimensions of TC4 titanium alloy plate are 301×117×53 (length×width×thickness) mm, and the dimensions of 42CrMo alloy steel plate are 301×117×32 (length×width×thickness) mm;

[0064] 2) Remove the iron oxide scale and oil stains on the surface of TC4 titanium alloy plate and 42CrMo alloy steel plate;

[0065] 3) heating the TC4 titanium alloy plate and the 42CrMo alloy steel plate at a heating temperature of 900° C. for a holding time of 53 minutes;

[0066] 4) quickly placing the heated TC4 titanium alloy plate and 42CrMo alloy steel plate into a pre-made forging die with vacuum protection or inert gas protection conditions;

[0067] 5) Pressurized forging, the start forging temperature is controlled at 890°C, the final forging temperature is controlled at 830°C, the forging ratio is 43.5%, and the semi-finished product is obtained after forging;

[0068] The forged semi-finished product is subjected to overall heat treatment, including solution treatment and tempering treatment. The solution heating temperature is 900°C, the holding time is 80 minutes, and after the holding is completed, it is quickly cooled to room temperature using water at room temperature; the tempering temperature is 400°C, the holding time is 100 minutes, and after the holding is completed, it is air-cooled to room temperature. The track shoe after heat treatment is sandblasted to obtain a finished track shoe.

[0069] Example 2

[0070] TC4 titanium alloy plate is selected as raw material, and the chemical composition of TC4 meets the composition requirements of GB / T3621-1994. 42CrMo alloy steel plate is selected as raw material, and the composition of 42CrMo alloy steel meets the composition requirements of GB / T3077-2015. The above titanium alloy plate and alloy steel are used as raw materials to manufacture split titanium-steel composite structure forged crawler plates.

[0071] 6) The dimensions of TC4 titanium alloy plate are 290×126×43 (length×width×thickness) mm, and the dimensions of 42CrMo alloy steel plate are 290×126×22 (length×width×thickness) mm;

[0072] 7) Remove iron oxide scale and oil stains on the surface of TC4 titanium alloy plate and 42CrMo alloy steel plate;

[0073] 8) heating the TC4 titanium alloy plate and the 42CrMo alloy steel plate at a temperature of 910° C. for a holding time of 43 minutes;

[0074] 9) quickly placing the heated TC4 titanium alloy plate and 42CrMo alloy steel plate into a pre-made forging die with vacuum protection or inert gas protection conditions;

[0075] 10) Pressurized forging, the start forging temperature is controlled at 890°C, the final forging temperature is controlled at 850°C, the forging ratio is 40%, and the semi-finished product is obtained after forging;

[0076] The forged semi-finished product is subjected to overall heat treatment, including solution treatment and tempering treatment. The solution heating temperature is 900°C, the holding time is 55 minutes, and after the holding is completed, it is quickly cooled to room temperature using water at room temperature; the tempering temperature is 400°C, the holding time is 70 minutes, and after the holding is completed, it is air-cooled to room temperature. The track shoe after heat treatment is sandblasted to obtain a finished track shoe.

[0077] Table 1 Mechanical properties of the examples

[0078]

[0079] The above-mentioned embodiment 1-2 uses TC4 titanium alloy plate and 42CrMo alloy steel plate as raw materials, and is forged by superimposing the raw materials and reasonably controlling the forging temperature and forging ratio and other parameters. The composite structure track plate overcomes the shortcomings of the single metal track plate and has a simple manufacturing process, good shape adaptability, obvious weight reduction effect, and the combination of the two materials has high strength, which can effectively ensure the durability and life of the track plate.

[0080] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A titanium-steel composite track shoe, characterized in that: The titanium-steel composite structure forged track plate comprises a titanium alloy plate and an alloy steel plate; wherein the titanium alloy plate is a matrix, and the alloy steel plate is arranged on the lower surface of the titanium alloy plate and contacts the ground.

2. The titanium-steel composite track shoe according to claim 1, characterized in that: The titanium alloy plate is a TC4 titanium alloy plate.

3. The titanium-steel composite track shoe according to claim 1 or 2, characterized in that: The alloy steel plate includes the following: 42CrMo alloy steel plate and 38CrSi alloy steel plate.

4. A method for preparing a titanium-steel composite track shoe, characterized in that: For preparing the titanium-steel composite track shoe according to any one of claims 1 to 3, the method comprises: Heating titanium alloy plates and alloy steel plates; Under vacuum protection or inert gas protection, the heated titanium alloy plate and the heated alloy steel plate are stacked and forged to obtain a semi-finished titanium-steel composite structure track plate; The semi-finished titanium-steel composite structure track shoe is heat treated to obtain the titanium-steel composite structure track shoe.

5. The method according to claim 4, characterized in that The forging process parameters include: the starting forging temperature is 890-920° C., the final forging temperature is 810-850° C., and the forging ratio is ≥40%.

6. The method according to claim 4, characterized in that The heating process parameters include: heating temperature 900-920° C., heating and heat preservation time (1T-1.5T) min / mm, and T represents the thickness of the titanium alloy plate.

7. The method according to claim 4, characterized in that The heat treatment of the semi-finished titanium-steel composite structure track shoe to obtain the titanium-steel composite structure track shoe comprises: The semi-finished titanium-steel composite structure track shoe is heat treated to obtain a titanium-steel composite structure track shoe; wherein the heat treatment includes solution treatment and tempering treatment.

8. The method according to claim 7, characterized in that The process parameters of the solution treatment include: a solution temperature of 900-920° C., a solution holding time of (2t-2.2t) min / mm, and t represents the thickness of the semi-finished titanium-steel composite structure track shoe.

9. The method according to claim 7 or 8, characterized in that: The process parameters of the tempering treatment include: a tempering temperature of 400-500° C., a tempering holding time of (2.5t-3t)min / mm, and t represents the thickness of the semi-finished titanium-steel composite structure track shoe.

10. The method according to claim 4, characterized in that The semi-finished titanium-steel composite structure track shoe is subjected to heat treatment to obtain the titanium-steel composite structure track shoe, and then the process further comprises: The alloy steel plate in the titanium-steel composite structure track shoe is post-processed, and the post-processing includes one of the following: surface quenching, carburizing and nitriding.

Images