Method for improving hardness of 0Cr12Mn5Ni4Mo3Al material

Abstract

The invention provides a method for improving the hardness of a 0Cr12Mn5Ni4Mo3Al material, and belongs to the technical field of heat treatment.The method comprises the steps that 1, adjustment treatment is conducted on a 0Cr12Mn5Ni4Mo3Al part, so that carbide is separated out from austenite; 2, the adjusted part is subjected to cold treatment and then dried, and martensite transformation treatment is completed; and 3, aging treatment is conducted on the part subjected to cold treatment, so that the hardness of the part meets the requirement. 0Cr12Mn5Ni4Mo3Al belongs to precipitation hardening stainless steel, the supply state is a hard state or a semi-hard state, precipitation hardening is generated through heat treatment aging, and the strength, hardness and elasticity of the material are improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of heat treatment, and particularly relates to a method for improving the hardness of 0Cr12Mn5Ni4Mo3Al material. BACKGROUND

[0002] The brace used for the aviation electric architecture product is made of 0Cr12Mn5Ni4Mo3Al, and the hardness of the part is insufficient after the heat treatment according to the prior art.

[0003] Solving the hardness problem of the part, stabilizing the process, improving the product quality and saving the material are of great significance to the development of enterprise research. SUMMARY

[0004] In order to solve the problem that the hardness of 0Cr12Mn5Ni4Mo3Al material cannot meet the design requirement after the heat treatment and aging, and the hardness of the part is insufficient, the application provides a method for improving the hardness of 0Cr12Mn5Ni4Mo3Al material, and the technical scheme is as follows. The application provides a method for improving the hardness of 0Cr12Mn5Ni4Mo3Al material, which comprises the following steps: Step 1, adjusting and processing 0Cr12Mn5Ni4Mo3Al parts, After the adjusting and processing, the austenite precipitates carbide, the composition changes, and the residual stress of the cold deformation is reduced; Step 2, cold processing the parts after the adjusting and processing to complete the martensite transformation processing, After the martensite transformation processing, most of the organization is transformed into low-carbon tempered martensite with good toughness; Step 3, aging the parts after the cold processing to make the hardness of the parts meet the requirement, After the aging processing, high strength and certain elasticity are obtained, the corrosion resistance and oxidation resistance are improved, and good comprehensive mechanical properties are obtained.

[0005] Optionally, in step 1, the 0Cr12Mn5Ni4Mo3Al parts are placed in a vacuum furnace, heated according to a first preset temperature and a first preset time length, then taken out and cooled in a tank for a second preset time length, and then air-cooled after taking out according to a first preset parameter.

[0006] Optionally, in step 2, the parts after the adjusting and processing are cold processed according to a second preset parameter.

[0007] Optionally, in step 3, the parts are placed in a vacuum furnace, heated and kept warm according to a second preset temperature and a third preset time length, and then air-cooled.

[0008] Optionally, the first preset temperature is 760±10℃, the first preset time length is 120-150 minutes, and the second preset time length is 5-10 minutes.

[0009] Optionally, the first preset parameter is that the part is cooled to below 15℃ within 1 hour and maintained for 30 minutes.

[0010] Optionally, the second preset parameter is that the temperature is -73±6℃ and the holding time length is 4-8 hours.

[0011] Optionally, the second preset temperature is 520±10℃, and the third preset time length is 90-120 minutes.

[0012] The present application has at least the following beneficial effects: The delivery state of the material is heat treatment solid solution treatment + cold deformation calendering, and the structure still has austenite structure, which ensures better plasticity under a greenhouse, thus being beneficial to the processing and forming of the part, and then through heat treatment aging, precipitation hardening is generated to improve the strength, hardness and elasticity of the material. After the solid solution treatment, the austenite structure is unstable, has good plasticity and processability, after the adjustment treatment of the present application, the austenite precipitates carbide, the composition changes, the residual stress of the cold deformation is reduced, and then through the martensite transformation treatment, most of the structure is transformed into low-carbon tempered martensite with better toughness, high strength and certain elasticity are obtained, and the corrosion resistance and oxidation resistance are improved, and better comprehensive mechanical properties are obtained.

[0013] After the part is heat treated by the method of the present application, the hardness of the part is greatly improved and can reach HRC52-53. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 is a heat treatment process schematic diagram of 0Cr12Mn5Ni4Mo3Al material provided by the present application; Figure 2 is a method flowchart for improving the hardness of 0Cr12Mn5Ni4Mo3Al material provided by the present application. DETAILED DESCRIPTION

[0015] To make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0016] The features and illustrative embodiments of various aspects of the present invention will now be described in detail. Numerous specific details are set forth in the following detailed description to provide a thorough understanding of the invention. However, it will be apparent to those skilled in the art that the invention may be practiced without requiring some of these specific details. The following description of embodiments is merely intended to provide a better understanding of the invention by illustrating examples of the invention. The invention is by no means limited to any specific setups and methods set forth below, but covers any improvements, substitutions, and modifications to structures, methods, and devices without departing from the spirit of the invention. Well-known structures and techniques are not shown in the drawings and the following description to avoid unnecessarily obscuring the invention.

[0017] It should be noted that, unless otherwise specified, the embodiments of the present invention and the features thereof can be combined with each other, and the various embodiments can be referenced and cited from each other.

[0018] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0019] This invention provides a heat treatment method for hardening 0Cr12Mn5Ni4Mo3Al material, which solves the problem that the hardness of 0Cr12Mn5Ni4Mo3Al material supplied in a semi-hard state does not meet the design requirements after standard heat treatment and aging, resulting in insufficient hardness of parts.

[0020] 0Cr12Mn5Ni4Mo3Al is a precipitation hardening stainless steel, supplied in a hard or semi-hard state. It has a low carbon content and a high content of alloying elements. Precipitation hardening occurs during heat treatment and aging, which improves the strength, hardness and elasticity of the material.

[0021] The heat treatment method for 0Cr12Mn5Ni4Mo3Al material provided by the present invention specifically includes adjustment treatment, cold treatment, and aging treatment of 0Cr12Mn5Ni4Mo3Al material parts.

[0022] See Figure 1 and Figure 2 The method for hardening 0Cr12Mn5Ni4Mo3Al material provided in this embodiment of the invention includes the following steps: Step 1: Adjust the 0Cr12Mn5Ni4Mo3Al part to induce austenite carbide precipitation, which changes the composition and reduces the residual stress from cold deformation.

[0023] Step 2: Perform cold treatment on the adjusted parts to complete the martensitic transformation treatment, and most of the structure is transformed into low-carbon tempered martensite with better toughness.

[0024] Step 3, the aged parts after cold treatment, the hardness of the parts meet the requirements, and the aged parts after cold treatment obtain high strength and certain elasticity, and improve the corrosion resistance and oxidation resistance, and obtain good comprehensive mechanical properties.

[0025] The material delivery state is heat treatment solid solution treatment + cold deformation calendering, and the structure still has austenite structure, so that good plasticity is ensured under a greenhouse, which is beneficial to the processing and forming of the parts, and then precipitation hardening is generated through heat treatment aging, so that the strength, hardness and elasticity of the material are improved.

[0026] After the solid solution treatment, the unstable austenite structure has good plasticity and processability, after the austenite precipitates carbides, the composition changes, the residual stress of cold deformation is reduced, and then the most of the structure is transformed into low-carbon tempered martensite with good toughness, so that high strength and certain elasticity are obtained, and the corrosion resistance and oxidation resistance are improved, and good comprehensive mechanical properties are obtained.

[0027] Referring to Figure 1 and Figure 2 , another embodiment of the present application provides a method for improving the hardness of 0Cr12Mn5Ni4Mo3Al material, which can include the following steps: Step 1, the 0Cr12Mn5Ni4Mo3Al parts are placed in a vacuum furnace, heated at 760±10℃ for 120-150 minutes, then taken out of the furnace and cooled for 5-10 minutes, then taken out of the tank and air-cooled, the parts are cooled to below 15℃ within 1 hour, and kept for 30 minutes, so that the austenite precipitates carbides, the composition changes, and the residual stress of cold deformation is reduced.

[0028] Step 2, the parts after the adjustment treatment are cold treated at a temperature of -73±6℃ for 4-8 hours, and the most of the structure is transformed into low-carbon tempered martensite with good toughness.

[0029] Step 3, the parts are placed in a vacuum furnace, heated and kept at 520±10℃ for 90-120 minutes, and then air-cooled, so that the hardness of the parts meets the requirements, and the aged parts after cold treatment obtain high strength and certain elasticity, and improve the corrosion resistance and oxidation resistance, and obtain good comprehensive mechanical properties.

[0030] The hardness of the parts after heat treatment is greatly improved and can reach HRC52-53. The 0Cr12Mn5Ni4Mo3Al material heat treatment method provided by the present application has been applied to an electric mechanism of an aviation product, and the problem of insufficient hardness of the stay bar parts is solved, so that the product can work normally.

[0031] The above merely expresses the embodiments of the present application, the description is more specific and detailed, but cannot be understood as the limitation of the patent scope. It should be noted that for ordinary skilled in the art, several modifications and improvements can be made without departing from the concept of the present application, which all belong to the protection scope of the present application. In addition, the unexplained part of the present application is all the routine technology.

Claims

1. A method for improving the hardness of 0Cr12Mn5Ni4Mo3Al material, characterized in that, The method includes: Step 1: Adjust the 0Cr12Mn5Ni4Mo3Al parts to induce carbide precipitation from the austenite. Step 2: Perform cold treatment on the adjusted parts, then dry them to complete the martensitic transformation treatment; Step 3: Perform aging treatment on the cold-treated parts to ensure that the hardness of the parts meets the requirements.

2. The method according to claim 1, characterized in that, In step 1, the 0Cr12Mn5Ni4Mo3Al part is placed in a vacuum furnace and heated according to the first preset temperature and the first preset time. Then it is taken out of the furnace and cooled in the can for the second preset time, and then air-cooled out of the can according to the first preset parameters.

3. The method according to claim 1, characterized in that, In step 2, the adjusted parts are subjected to cold treatment according to the second preset parameters.

4. The method according to claim 1, characterized in that, In step 3, the parts are placed in a vacuum furnace and heated and kept warm according to the second preset temperature and the third preset time, and then air-cooled.

5. The method according to claim 2, characterized in that, The first preset temperature is 760±10℃, the first preset duration is 120~150 minutes, and the second preset duration is 5~10 minutes.

6. The method according to claim 2, characterized in that, The first preset parameter is: the part is cooled to below 15°C within 1 hour and maintained for 30 minutes.

7. The method according to claim 3, characterized in that, The second preset parameters are: temperature -73±6℃, heat preservation time 4~8 hours.

8. The method according to claim 4, characterized in that, The second preset temperature is 520±10℃, and the third preset duration is 90-120 minutes.

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