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Method for preparing super martensitic stainless steel EBSD sample

A martensitic stainless steel and sample technology is applied in the field of preparing super martensitic stainless steel EBSD samples, which can solve the problem of insufficient calibration rate, and achieve the effects of easy temperature control, time-saving and convenient electropolishing process, and fast cooling rate.

Active Publication Date: 2021-01-01
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] When preparing EBSD samples by electropolishing, it has the characteristics of simple sample preparation, time saving and low cost. However, the calibration rate of super martensitic stainless steel EBSD samples prepared by electrolytic polishing is not high enough, so a new method is urgently needed. Method to prepare super martensitic stainless steel EBSD samples with higher calibration rate

Method used

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  • Method for preparing super martensitic stainless steel EBSD sample
  • Method for preparing super martensitic stainless steel EBSD sample
  • Method for preparing super martensitic stainless steel EBSD sample

Examples

Experimental program
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Effect test

Embodiment 1

[0044]In this embodiment, the surface of a 10×10 sample of 0.03C13Cr0.23N super martensitic stainless steel is polished.

[0045] Step 1. Mechanically grind the surface of the sample, and use 400#, 600#, 1000#, 1500#, 2000# water-based sandpaper to grind in sequence. Each time you grind, put a sandpaper vertically until the last grinding mark is removed. until it wears off. Then use a polishing machine to polish, and the polishing time is set to 2 minutes to obtain a mechanically polished sample, and the polishing solution is an alumina polishing agent.

[0046] Step 2. Pour 240ml C into the beaker 2 h 5 OH and 120ml CH 3 COOH, then add 40ml HCLO 4 Drain with a glass rod and mix evenly to obtain a polishing solution.

[0047] Step 3. Put the polishing solution into the beaker and place it on a magnetic stirrer. The stirrer speed is set to 120r / min. Then put the stainless steel plate into the beaker and connect it to the negative pole of the power supply. Use the stainless...

Embodiment 2

[0052] In this embodiment, the surface of a 10×10 sample of 0.03C13Cr0.3N super martensitic stainless steel is polished.

[0053] Step 1. Mechanically grind the surface of the sample, and use 400#, 600#, 1000#, 1500#, 2000# water-based sandpaper to grind in sequence. Each time you grind, put a sandpaper vertically until the last grinding mark is removed. until it wears off. Then use a polishing machine to polish, and the polishing time is set to 2.5 minutes to obtain a mechanically polished sample, and the polishing solution is an alumina polishing agent.

[0054] Step 2. Pour 240mlC into the beaker 2 h 5 OH and 120mlCH 3 COOH, then add 40ml HCLO 4 Drain with a glass rod and mix evenly to obtain a polishing solution.

[0055] Step 3. Put the polishing solution into the beaker and place it on a magnetic stirrer. The stirrer speed is set to 140r / min. Then put the stainless steel plate into the beaker and connect it to the negative pole of the power supply. Use the stainless...

Embodiment 3

[0060] In this embodiment, the surface of a 10×10 sample of 0.03C13Cr0.35N super martensitic stainless steel is polished.

[0061] Step 1. Mechanically grind the surface of the sample, and use 400#, 600#, 1000#, 1500#, 2000# water-based sandpaper to grind in sequence. Each time you grind, put a sandpaper vertically until the last grinding mark is removed. until it wears off. Then use a polishing machine to polish, and the polishing time is set to 3 minutes to obtain a mechanically polished sample, and the polishing solution is aluminum oxide polishing agent.

[0062] Step 2. Pour 240mlC into the beaker 2 h 5 OH and 120mlCH 3 COOH, then add 40ml HCLO 4 Drain with a glass rod and mix evenly to obtain a polishing solution.

[0063] Step 3. Put the polishing solution into the beaker and place it on a magnetic stirrer. Set the stirrer speed to 120r / min. Then put the stainless steel plate into the beaker and connect it to the negative pole of the power supply. Use the stainless...

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Abstract

The invention discloses a method for preparing a super martensitic stainless steel EBSD sample. The method comprises the steps of polishing solution preparation, sample grinding, electrolytic polishing and polished surface cleaning; a polishing solution is prepared by mixing HCLO4, CH3COOH and C2H5OH according to the volume ratio of (1 + / -0.1): (3 + / -0.1): (6 + / -0.1), a stainless steel sheet is used as a cathode, and the super martensitic stainless steel sample serves as an anode; then an electrolysis device is placed on a magnetic stirrer, liquid nitrogen is used for cooling the electrolyte,and the power voltage is adjusted; finally, a stainless steel clamp is used for immersing the sample into the electrolyte, the grinding face is parallel to the cathode stainless steel sheet, the powercurrent is adjusted, and polishing is started; and after polishing is completed, the sample is taken out to be wiped and dried. According to the method, the polishing time is short, the polishing efficiency is high, and the EBSD collecting and calibrating rate can reach 95% or above.

Description

technical field [0001] The invention belongs to the technical field of electrolytic polishing methods, in particular to a method for preparing super martensitic stainless steel EBSD samples. Background technique [0002] Super martensitic stainless steel not only has the characteristics of traditional martensitic stainless steel, but also has good corrosion resistance in carbon dioxide environment or carbon dioxide and hydrogen sulfide environment, and excellent welding performance. It is widely used in key structures and components, such as , turbines, ship propellers, aircraft parts and oil and gas field pipelines. There are lath martensite and retained austenite in super martensitic stainless steel. Different heat treatment processes will change the structure and state of the steel. Study the orientation relationship between martensite and austenite and the structure of retained austenite. Content, shape and size are of great significance. Using TEM technology is not on...

Claims

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Application Information

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IPC IPC(8): C25F3/24G01N1/32
CPCC25F3/24G01N1/32
Inventor 庞阳邹德宁李苗苗佟立波赵碧芳闫星宇
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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