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CN-121992185-A - High-strength and high-toughness armored steel heat treatment method and application method thereof in special vehicle

CN121992185ACN 121992185 ACN121992185 ACN 121992185ACN-121992185-A

Abstract

The invention discloses a heat treatment method of high-strength and toughness armored steel and an application method thereof on special vehicles, belonging to the technical field of application of metal armored materials, wherein the high-strength and toughness armored steel is DF1600A series armored steel A with independent intellectual property rights, and different hardness and toughness are obtained through different heat treatment methods; the heat treatment method adopts a common austenitizing and tempering process scheme, wherein the austenitizing process has the same process parameters, the main difference is that the special vehicle generally refers to a 4X 4 or 6X 6 wheel type special vehicle through the process parameters of high, medium and low temperature tempering, the application method on the special vehicle disclosed by the invention is to apply DF1600A series armor steels with different hardness and toughness at different positions of a vehicle body, and the application method adopting the same alloy component and different heat treatment process armor steels has wide application prospect on crawler type special vehicles and civil vehicles due to the fact that the alloy components are the same and the manufacturability of connection at different positions is good.

Inventors

  • ZHOU HUAHAI
  • XU LU
  • CHEN SHENGCHAO
  • LU HAIYAN
  • WANG SHIPING

Assignees

  • 湖北长平汽车装备有限公司

Dates

Publication Date
20260508
Application Date
20260203

Claims (10)

  1. 1. A heat treatment method of high-strength and high-toughness armored steel and an application method of the high-strength and high-toughness armored steel on special vehicles are characterized by comprising the following steps of: Selecting a high-strength and high-toughness armored steel raw material, and determining an application scene of an adapted special vehicle; step two, austenitizing the selected armor steel raw material; Selecting corresponding tempering processes according to performance requirements of different parts of the special vehicle to treat the austenitized armored steel, wherein the tempering processes comprise three types of high-temperature tempering, medium-temperature tempering and low-temperature tempering, and the requirements of protection and support of different parts are respectively matched; Step four, planning specific application positions of the armored steel after heat treatment on special vehicles, and determining matching rules of each position and the armored steel corresponding to tempering technology; step five, according to the preset armor steel performance standard reference value (including core parameters such as hardness, impact toughness and the like) of the invention, carrying out preliminary inspection on the tempered armor steel sample, carrying out the assembly work of a sample car after passing the inspection, and returning to the step three to adjust tempering process parameters for reprocessing if failing the inspection; Step six, assembling the armored steel treated by different tempering processes to corresponding positions of the special vehicle, and completing connection and fixation; and seventhly, verifying the performance of the assembled armored steel component, and confirming to meet the preset application performance requirements and the related protection standards of the special vehicle.
  2. 2. The heat treatment method of high strength and toughness armored steel and the application method thereof on special vehicles as claimed in claim 1, wherein in the first step, the process of selecting raw materials of the armored steel and determining application scenes is as follows: s1, selecting DF1600A series armor steel (comprising A, B, C types) as a raw material, wherein the series armor steel has basic high-strength and high-toughness characteristics and meets the protection requirements of special vehicles; s2, defining a vehicle body structural part of the 4X 4 or 6X 6 wheeled special vehicle as a target application scene, and specifically covering core parts such as a vehicle body side wall, a front windshield frame, a floor, a bottom lightning protection bottom plate and the like.
  3. 3. The heat treatment method of high strength and toughness armored steel and the application method thereof on special vehicles according to claim 1, wherein in the second step, the austenitizing treatment process is as follows: S1, placing DF1600A series armored steel raw materials into a heat treatment furnace, and heating to 900-950 ℃; s2, preserving heat for 1-2 hours at the temperature, and ensuring complete austenitization of the armor steel through accurate temperature control and heat preservation duration; And S3, cooling the armored steel to room temperature in an oil cooling mode, wherein the cooling rate can ensure that austenite is fully transformed into martensite, and austenitizing treatment is completed.
  4. 4. The heat treatment method of high strength and toughness armored steel and the application method thereof on special vehicles as claimed in claim 1, wherein in the third step, the high temperature tempering process is performed as follows: S1, placing austenitized armored steel into a tempering furnace, and heating to 600 ℃ (preferably) temperature; s2, preserving heat for 2-3 hours to fully transform the armor steel structure; s3, cooling to room temperature along with the furnace to obtain the armored steel finished product with low hardness and high toughness.
  5. 5. The heat treatment method of high strength and toughness armored steel and the application method thereof on special vehicles as claimed in claim 1, wherein in the third step, the middle temperature tempering process is performed as follows: s1, placing austenitized armored steel into a tempering furnace, and heating to 400 ℃ (preferred temperature); S2, preserving heat for 1.5-2.5 hours, and regulating and controlling the property balance of the armored steel; s3, air cooling to room temperature to obtain the armor steel finished product with medium hardness and medium toughness.
  6. 6. The heat treatment method of high strength and toughness armored steel and the application method thereof on special vehicles as claimed in claim 1, wherein in the third step, the low temperature tempering process is performed as follows: S1, placing austenitized armored steel into a tempering furnace, and heating to 200 ℃ (preferably) temperature; s2, preserving heat for 1-1.5 hours, and reducing the internal stress of the armor steel; S3, air cooling to room temperature to obtain the armor steel finished product with high hardness and medium toughness.
  7. 7. The heat treatment method of high strength and toughness armored steel and the application method thereof on special vehicles according to claim 1, wherein in the fourth step, the process of applying position planning is as follows: s1, dividing the body of a special vehicle into a part, namely a critical stress part and a protection part, and particularly dividing the part into a bulletproof protection core part and a structural support bearing part; S2, analyzing the core requirements of all parts, determining that the core requirements of the bulletproof protection part are high-hardness penetration resistance, and the core requirements of the structural support part are high-strength toughness deformation resistance; S3, matching the hardness and toughness parameters of the armor steel required by each part to form an armor performance parameter table of each position, wherein the corresponding table contains key information such as part names, core performance requirements, adaptation tempering process, hardness range, impact toughness range and the like.
  8. 8. The heat treatment method of high-strength and high-toughness armored steel and the application method thereof on special vehicles according to claim 1 or 7, wherein in the fourth step, the armored steel at different positions is selected by the following steps: s1, selecting high-hardness and medium-toughness armored steel obtained after low-temperature tempering processing according to the side wall position of a vehicle body and the front windshield frame position of the vehicle body because the bulletproof protection requirement is met; s2, aiming at the floor position of the automobile body and the lightning protection bottom plate position of the automobile bottom, selecting low-hardness and high-toughness armored steel obtained after high-temperature tempering because the requirements of molding manufacturability and structural support are met; S3, checking the armor parameter table at each position with the corresponding standard reference table to ensure that the performance numerical values of the steel materials selected at each position are matched without errors.
  9. 9. The method for heat treatment of high strength and toughness armored steel and application method thereof to special vehicles according to claim 1, wherein in the sixth step, the assembling and connecting process of the armored steel is as follows: S1, preprocessing armored steel treated by different tempering processes, and removing surface oxide skin and greasy dirt by adopting a sand blasting mode; s2, connecting the parts in a welding mode, and welding with high consistency by using a welding material with the same alloy composition as the armored steel; S3, carrying out multi-angle and multi-time flaw detection on the welded joint by adopting an ultrasonic flaw detection mode, wherein the detection standard is that the welded joint has no defects such as cracks and air holes, and the connection strength is ensured to meet the connection strength requirement of the special vehicle body structure.
  10. 10. The heat treatment method of high strength and toughness armored steel and the application method thereof on special vehicles according to claim 1, wherein in the seventh step, the performance verification process is as follows: S1, performing hardness test and impact toughness test on armor steel at each part, and verifying whether a test result accords with a preset design parameter range; S2, performing bulletproof and lightning protection performance simulation test on the whole vehicle by using an experimental vehicle according to the relevant standard of the protection grade of the special vehicle, and checking the actual application effect of the armored steel; and S3, if all the test items reach the standard, finishing application, and if not, returning to related steps to check the problems and reprocessing.

Description

High-strength and high-toughness armored steel heat treatment method and application method thereof in special vehicle Technical Field The invention relates to the technical field of application of metal armor materials, in particular to a heat treatment method of high-strength and high-toughness armor steel and an application method of the high-strength and high-toughness armor steel to special vehicles. Background With the continuous upgrading of national defense construction and special operation demands, special vehicles such as 4 multiplied by 4, 6 multiplied by 6 wheels and the like have strict requirements on the protection performance, structural strength and service reliability of structural components of a vehicle body, and core parts such as side walls, front windshield frames, floors, bottom lightning protection bottom plates and the like of the vehicle body serve as key protection and bearing components of the special vehicles, and different performance suitability is considered, wherein the bulletproof protection core parts such as the side walls, the front windshield frames and the like are required to have high hardness to resist ammunition penetration, and the structural support bearing parts such as the floors, the bottom lightning protection bottom plates and the like are required to have excellent toughness to cope with impact loads and adapt to molding processing demands. At present, the application of the armor steel for special vehicles has a plurality of technical bottlenecks, on one hand, the existing armor steel materials are mostly imported, the general armor steel is difficult to meet the performance requirements of different position differentiation, if the armor steel with single performance parameters is adapted to the key parts of the whole vehicle, the problems of insufficient protection or brittle fracture of the structure and the like are easy to occur, on the other hand, the existing heat treatment process system is imperfect, the accurate tempering process design aiming at different application scenes is lacking, the accurate matching of the hardness and the toughness of the armor steel is difficult to realize through heat treatment regulation and control, the discreteness of the performance of the armor steel finished product is large, and the protection grade requirements of the special vehicles cannot be met stably. Disclosure of Invention The invention aims to develop a heat treatment process which is based on independent intellectual property armored steel raw materials and can realize accurate regulation and control of performance, and establish adaptation and application systems of different parts of the heat treatment process and special vehicles, thereby becoming the key for solving the pain point of the armor protection technology of the current special vehicles and improving the core competitiveness of domestic special vehicles and having important national defense and industrial application values. The invention provides a heat treatment method of high-strength and high-toughness armored steel and an application method of the high-strength and high-toughness armored steel on a special vehicle, and specifically comprises the following steps: Selecting a high-strength and high-toughness armored steel raw material, and determining an application scene of an adapted special vehicle; step two, austenitizing the selected armor steel raw material; Selecting corresponding tempering processes according to performance requirements of different parts of the special vehicle to treat the austenitized armored steel, wherein the tempering processes comprise three types of high-temperature tempering, medium-temperature tempering and low-temperature tempering, and the requirements of protection and support of different parts are respectively matched; Step four, planning specific application positions of the armored steel after heat treatment on special vehicles, and determining matching rules of each position and the armored steel corresponding to tempering technology; step five, according to the preset armor steel performance standard reference value (including core parameters such as hardness, impact toughness and the like) of the invention, carrying out preliminary inspection on the tempered armor steel sample, carrying out the assembly work of a sample car after passing the inspection, and returning to the step three to adjust tempering process parameters for reprocessing if failing the inspection; Step six, assembling the armored steel treated by different tempering processes to corresponding positions of the special vehicle, and completing connection and fixation; and seventhly, verifying the performance of the assembled armored steel component, and confirming to meet the preset application performance requirements and the related protection standards of the special vehicle. Preferably, in the first step, the process of selecting the armor steel raw material and determi