Austenite alloy EBSD sample preparation method

Abstract

The invention discloses an austenite alloy EBSD sample preparation method. The preparation method comprises austenite alloy sample preparation, grinding, polishing, fine polishing, two-step ultrasonictreatment and drying steps, wherein for the fine polishing step, in the fine polishing process, silica suspension liquid with particle size of 20-50nm is used, the rotation speed of a metallographical polishing machine is smaller than or equal to 100 turn / min, and fine polishing time is larger than or equal to 10 min; and for the two-step ultrasonic treatment step, the first ultrasonic treatmentstep is characterized by placing the samples in a 10%NaOH aqueous solution, which is 10-45 DEG C, for ultrasonic cleaning, the cleaning time being larger than or equal to 3 min. Compared with the national standard GBT19501, the method does not need the electropolishing process and does not need to purchase special equipment, thereby reducing preparation steps, making preparation simple and convenient and reducing cost; and the problems that an existing electropolishing method needs special equipment, is high in sample preparation cost and is long in polishing process exploration time, and electrolyte pollutes the environment and the like are overcome effectively.

Description

technical field [0001] The invention belongs to the field of preparation of electron microscope samples, and in particular relates to a preparation method of austenitic alloy EBSD samples. Background technique [0002] Austenitic alloys, including stainless steel and nickel-based alloys, are widely used as key structural materials in petroleum, chemical, nuclear power and other industrial sectors. The coupling effect of corrosion and complex stress in the service environment greatly increases the sensitivity of the material to environmental damage, and the grain boundary is the weak link of the material, which is prone to failure. [0003] The electron backscatter diffraction (EBSD) technique is based on the Kikuchi pattern formed by electrons acting on the inclined sample surface in the scanning electron microscope to determine the crystal structure, orientation and other information. It can be used to study the grain boundary characteristics of austenitic alloys and struc...

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Problems solved by technology

[0004] The Kikuchi pattern obtained by the EBSD experiment requires the sample surface to be flat, clean, and free of strain layers, while the surface of the sample that is generally mechanically polished cannot meet the experimental needs

The national standard GBT19501 recommends the electrolytic polishing method for sample preparation for metal materials. The sample preparation process of this method is complex and requires special equipment. It takes a lot of time to explore the electrolyte ratio and current and voltage in the early stage, and low-temperature polishing consumes a lot of energy, and the electrolyte pollutes the environment.

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