Method and device for extracting carbides in martensitic stainless steel

Abstract

The invention belongs to the technical field of material analysis, and particularly relates to a method and device for extracting carbides in martensitic stainless steel. The invention provides a method for decomposing martensitic stainless steel through a chemical method. By decomposing an iron matrix, carbides in steel are reserved, and quantitative and qualitative analysis of the carbides in the steel is facilitated. The extraction method provided by the invention is suitable for most martensitic stainless steel, including but not limited to 2Cr13, 3Cr13, 4Cr13, 5Cr15, 5Cr15MoV, 9Cr18, 9Cr18MoV and other martensitic stainless steel.

Description

Technical Field

[0001] The invention belongs to the technical field of material analysis, and in particular relates to a method and a device for extracting carbides from martensitic stainless steel. Background Art

[0002] Martensitic stainless steel is widely used in industry due to its excellent mechanical properties and corrosion resistance. However, carbides in steel have a significant impact on its properties, so quantitative and qualitative analysis of carbides is essential. Traditional methods make it difficult to effectively separate and observe carbides without destroying their structure. Summary of the invention

[0003] The present invention provides a method and a device for extracting carbides from martensitic stainless steel, so as to solve the problem in the prior art that it is difficult to effectively separate and observe carbides without destroying the carbide structure.

[0004] To achieve the above object, the present invention proposes the following technical solutions:

[0005] A method for extracting carbides from martensitic stainless steel comprises the following steps:

[0006] Step 1, polishing the martensitic stainless steel sample;

[0007] Step 2, placing the polished martensitic stainless steel sample into a hydrochloric acid solution to dissolve the iron matrix in the martensitic stainless steel sample into the solution;

[0008] Step 3, filtering the dissolved liquid through filter paper into a container;

[0009] Step 4, washing and drying the filter paper to obtain a dry solid precipitate powder on the filter paper, that is, a carbide.

[0010] Preferably, in step 2, the concentration of the hydrochloric acid solution is 20%.

[0011] Preferably, in step 3, a vacuum press is used to speed up the filtration speed.

[0012] Preferably, in step 4, the filter paper is washed with deionized water and alcohol in sequence;

[0013] Preferably, in step 4, the filter paper is dried using an automatic dryer.

[0014] A device for extracting carbides from martensitic stainless steel, used in the method for extracting carbides from martensitic stainless steel, comprising an automatic sample grinder, a chemical dissolution device, a filtering device, a cleaning device and a pumping machine;

[0015] The automatic sample grinding machine, chemical dissolving device, filtering device, cleaning device and pumping machine are connected in sequence;

[0016] The automatic sample grinder is used to grind the martensitic stainless steel sample; the chemical dissolution device is used to put the polished martensitic stainless steel sample into a hydrochloric acid solution to dissolve the iron matrix in the martensitic stainless steel sample in the solution; the filtering device is used to filter the dissolved liquid into a container through filter paper; the cleaning device is used to clean the filter paper; and the pumping machine is used to accelerate the filtering speed of the filter paper.

[0017] Preferably, the device for extracting carbides from martensitic stainless steel further comprises an automatic drying machine;

[0018] The automatic drying machine is connected to the suction and pressing machine and is used for drying the filter paper.

[0019] Preferably, in step 2, the concentration of the hydrochloric acid solution is 20%.

[0020] Preferably, the cleaning device uses deionized water and alcohol to clean the filter paper in sequence.

[0021] The present invention is beneficial in that:

[0022] The present invention decomposes martensitic stainless steel by chemical method, retains carbides in the steel, facilitates quantitative and qualitative analysis of carbides in the steel, can effectively separate and observe carbides in martensitic stainless steel, and is applicable to most martensitic stainless steels, including but not limited to 2Cr13, 3Cr13, 4Cr13, 5Cr15, 5Cr15MoV, 9Cr18, 9Cr18MoV, etc. The method is simple to operate, and the analysis results are accurate and reliable, which provides an important basis for optimizing the performance of martensitic stainless steel. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0024] Figure 1 The figure is a schematic flow chart of a method for extracting carbides from martensitic stainless steel;

[0025] Figure 2 This is a schematic diagram of the structure of a device for extracting carbides from martensitic stainless steel. DETAILED DESCRIPTION

[0026] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be noted that the embodiments and features in the embodiments of the present invention can be combined with each other without conflict.

[0027] The following detailed description is an exemplary description, which is intended to provide further detailed description of the present invention. Unless otherwise specified, all technical terms used in the present invention have the same meaning as those generally understood by those skilled in the art to which the present invention belongs. The terms used in the present invention are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present invention.

[0028] See also Figure 1 As shown, the present invention provides a method for extracting carbides from martensitic stainless steel, comprising the following steps:

[0029] Step 1, polishing the martensitic stainless steel sample;

[0030] Step 2, placing the polished martensitic stainless steel sample into a hydrochloric acid solution, so that the iron matrix in the martensitic stainless steel sample is dissolved in the solution, while precipitates such as carbides are insoluble;

[0031] Step 3, filtering the dissolved liquid through filter paper into a container;

[0032] Step 4, use a pump to speed up the filtration, and then wash the filter paper with deionized water and alcohol in turn;

[0033] Step 5, drying the filter paper using an automatic dryer;

[0034] Step 6, obtaining a dry solid precipitate powder on filter paper, that is, obtaining a carbide.

[0035] In one specific embodiment, the concentration of the hydrochloric acid solution is 20%.

[0036] See also Figure 2 As shown, the present invention also provides a device for extracting carbides from martensitic stainless steel, which is used to implement the above method, comprising:

[0037] Automatic sample grinding machine 1, used for grinding the four sides of the sample;

[0038] A chemical dissolution device 2, comprising a hydrochloric acid solution container, for dissolving the iron matrix;

[0039] A filtering device 3, comprising filter paper and a container, for filtering the dissolved liquid;

[0040] A cleaning device 4, including a deionized water and alcohol supply system, is used to clean the filter paper;

[0041] A pumping machine 5 is used to speed up the filtration speed;

[0042] In a specific embodiment, the device for extracting carbides from martensitic stainless steel further comprises an automatic dryer for drying the filter paper.

[0043] The invention discloses a method and device for extracting carbides from martensitic stainless steel. The invention proposes a method for decomposing martensitic stainless steel by chemical method. By decomposing the iron matrix, carbides in the steel are retained, which facilitates quantitative and qualitative analysis of carbides in the steel. The extraction method of the invention is applicable to most martensitic stainless steels, including but not limited to 2Cr13, 3Cr13, 4Cr13, 5Cr15, 5Cr15MoV, 9Cr18, 9Cr18MoV and other martensitic stainless steels.

[0044] It is known from common technical knowledge that the present invention can be implemented by other embodiments that do not deviate from its spirit or essential features. Therefore, the above disclosed embodiments are only illustrative in all respects and are not exclusive. All changes within the scope of the present invention or within the scope equivalent to the present invention are included in the present invention.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A method for extracting carbides from martensitic stainless steel, characterized in that: The method comprises the following steps: Step 1, polishing the martensitic stainless steel sample; Step 2, placing the polished martensitic stainless steel sample into a hydrochloric acid solution to dissolve the iron matrix in the martensitic stainless steel sample into the solution; Step 3, filtering the dissolved liquid through filter paper into a container; Step 4, washing and drying the filter paper to obtain a dry solid precipitate powder on the filter paper, that is, a carbide.

2. A method for extracting carbides from martensitic stainless steel according to claim 1, characterized in that: In step 2, the concentration of the hydrochloric acid solution is 20%.

3. A method for extracting carbides from martensitic stainless steel according to claim 1, characterized in that: In step 3, a vacuum press is used to speed up the filtration speed.

4. A method for extracting carbides from martensitic stainless steel according to claim 1, characterized in that: In step 4, the filter paper is washed with deionized water and alcohol in sequence.

5. A method for extracting carbides from martensitic stainless steel as claimed in claim 1, characterized in that: In the step 4, the filter paper is dried using an automatic dryer.

6. A device for extracting carbides from martensitic stainless steel, used for implementing a method for extracting carbides from martensitic stainless steel according to any one of claims 1 to 5, characterized in that: It includes automatic sample grinding machine, chemical dissolving device, filtering device, cleaning device and pumping machine; The automatic sample grinding machine, chemical dissolving device, filtering device, cleaning device and pumping machine are connected in sequence; The automatic sample grinding machine is used to grind the martensitic stainless steel sample; The chemical dissolution device is used to place the polished martensitic stainless steel sample into a hydrochloric acid solution to dissolve the iron matrix in the martensitic stainless steel sample into the solution; The filtering device is used to filter the dissolved liquid into a container through filter paper; The cleaning device is used for cleaning the filter paper; the pumping machine is used for accelerating the filtering speed of the filter paper.

7. The device for extracting carbides from martensitic stainless steel according to claim 6, characterized in that: The device for extracting carbides from martensitic stainless steel also includes an automatic dryer; The automatic drying machine is connected to the suction and pressing machine and is used for drying the filter paper.

8. The device for extracting carbides from martensitic stainless steel according to claim 6, characterized in that: In step 2, the concentration of the hydrochloric acid solution is 20%.

9. The device for extracting carbides from martensitic stainless steel according to claim 6, characterized in that: The cleaning device uses deionized water and alcohol to clean the filter paper in sequence.

Images