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Corrosion method capable of displaying original austenite grain boundary of high-nitrogen martensite stainless steel

A martensitic stainless steel and austenite grain boundary technology, applied in the preparation of test samples, etc., can solve the problems of failing to measure and evaluate the grain size, not being able to corrode high-nitrogen martensitic stainless steel, and not showing, etc. To achieve the effect of excellent structure and performance

Active Publication Date: 2017-08-04
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, according to the currently published literature and patents, there are few reports on the corrosion method of the prior austenite grain boundary of high nitrogen martensitic stainless steel
In addition, some of the existing corrosion methods cannot corrode high-nitrogen martensitic stainless steel, some preferentially corrode lath martensite structure, the original austenite grain boundary is not displayed or incomplete, and none of them can reach the measurement and evaluation grain size. Purpose

Method used

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  • Corrosion method capable of displaying original austenite grain boundary of high-nitrogen martensite stainless steel
  • Corrosion method capable of displaying original austenite grain boundary of high-nitrogen martensite stainless steel
  • Corrosion method capable of displaying original austenite grain boundary of high-nitrogen martensite stainless steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The chemical composition of the high nitrogen martensitic stainless steel 30Cr15Mo1N sample in this example is shown in Table 1.

[0035] The chemical composition (wt%) of table 1 high nitrogen martensitic stainless steel 30Cr15Mo1N sample

[0036]

[0037] The high-nitrogen martensitic stainless steel 30Cr15Mo1N described in this example is prepared by melting in a 25kg pressurized induction furnace. First, the ingot is forged into a round bar with a diameter of 80mm at 1050-1150°C, and then kept at 800°C for 6 hours and then cooled to room temperature with the furnace.

[0038] (1) Metallographic sample preparation:

[0039] The samples to be tested with the size of 10 mm × 10 mm × 5 mm were cut from the high nitrogen martensitic stainless steel 30Cr15Mo1N round bar by wire cutting machine, and after quenching at different temperatures and oil cooling (quenching temperatures were 1000 ° C, 1020 ° C, 1050 ° C respectively and 1100°C, keep warm for 55-60 minutes), ...

Embodiment 2

[0066] The chemical composition of the high nitrogen martensitic stainless steel 55Cr18Mo1VN sample in this example is shown in Table 2.

[0067] The chemical composition (wt%) of table 2 high nitrogen martensitic stainless steel 55Cr18Mo1VN sample

[0068]

[0069] The high-nitrogen martensitic stainless steel 55Cr18Mo1VN described in this example is prepared by melting in a 25kg pressurized induction furnace. First, the ingot is forged into a round bar with a diameter of 80mm at 1060-1160°C, and then it is kept at 800°C for 6 hours and then cooled to room temperature with the furnace.

[0070] (1) Metallographic sample preparation:

[0071] A wire cutting machine was used to cut a sample to be tested with a size of 10 mm × 10 mm × 5 mm on a high-nitrogen martensitic stainless steel 55Cr18Mo1V round bar. ~60min), the test surface of the sample to be tested is roughly ground, finely ground, and polished to make the test surface bright without any defects such as scratches...

Embodiment 3

[0082] The chemical composition of the high nitrogen martensitic stainless steel 55Cr18Mo1VN sample in this example is shown in Table 2.

[0083] The chemical composition (wt%) of table 2 high nitrogen martensitic stainless steel 55Cr18Mo1VN sample

[0084]

[0085] The high-nitrogen martensitic stainless steel 55Cr18Mo1VN described in this example is prepared by melting in a 25kg pressurized induction furnace. First, the ingot is forged into a round bar with a diameter of 80mm at 1060-1160°C, and then it is kept at 800°C for 6 hours and then cooled to room temperature with the furnace.

[0086] (1) Metallographic sample preparation:

[0087] The sample to be tested with a size of 10 mm × 10 mm × 5 mm was cut from a high-nitrogen martensitic stainless steel 55Cr18Mo1V round bar by a wire cutting machine. The test surface of the test sample is rough ground, fine ground and polished to make the test surface bright without any defects such as scratches, pits and stains, and ...

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Abstract

The invention discloses a corrosion method capable of displaying an original austenite grain boundary of high-nitrogen martensite stainless steel. The high-nitrogen martensite stainless steel contains the following components by percentages: 0.2-0.6% of C, not greater than 1.0% of Si, not greater than 1.0% of Mn, 15.0-18.0% of Cr, 0.5-1.5% of Mo, 0.25-0.5% of N and the balance of Fe. The corrosion method comprises the following steps: (1) processing a hardened high-nitrogen martensite stainless steel corrosion sample according to a conventional method; (2) putting a polishing surface of the sample into a corrosion solution I heated to 65-75 DEG C, carrying out constant-temperature etching for 20-50min and taking out the polishing surface when the polishing surface of the sample is rusted; and (3) dipping a corrosion solution II by using cotton, repeatedly wiping the polishing surface of the sample treated in the step (2) until the polishing surface of the sample is silver gray, cleaning and drying. The corrosion method is capable of clearly and completely displaying the original austenite grain boundary of the high-nitrogen martensite stainless steel, the requirements of measuring and evaluating the grain sizes are achieved and a technical support is provided for formulation of reasonable heat treatment for the steel.

Description

technical field [0001] The invention belongs to the technical field of metallographic structure observation, and in particular relates to a corrosion method for displaying the original austenite grain boundary of high-nitrogen martensitic stainless steel. Background technique [0002] Nitrogen is added to martensitic stainless steel as an important alloying element. Through the synergistic effect with other elements (Cr, Mn, etc.), it can significantly increase the strength of stainless steel without reducing its toughness, and can also greatly enhance its resistance. abrasion and corrosion resistance. Therefore, as an important engineering material, high-nitrogen martensitic stainless steel has broad application prospects in the fields of aviation, aerospace, electric power, medical equipment and knives. [0003] The heat treatment process can significantly affect the microstructure and properties of high nitrogen martensitic stainless steel. Quenching is a very important...

Claims

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Application Information

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IPC IPC(8): G01N1/32
Inventor 李花兵焦卫超冯浩姜周华韩宇朱红春张树才张彬彬
Owner NORTHEASTERN UNIV
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