Method for detecting formation of nanocrystals on 690 high-strength steel surfaces

Abstract

The invention discloses a method for detecting formation of nanocrystals on 690 high-strength steel surfaces. The method comprises the following steps of carrying out extreme plastic strain on a plurality of 690 high-strength steel samples under the same process and different process parameters; carrying out X-ray diffraction on the samples after extreme plastic strain to obtain a group of X-ray diffraction patterns; calculating the full width at half maximum of the same crystal surface under each process parameter; and drawing a curve graph of the full width at half maximum changing along with each process parameter and finding out an increase inflection point and verifying that the process parameter of the extreme plastic strain corresponding to the increase inflection point is the minimal process parameter for forming the nanocrystals on the 690 high-strength steel surfaces through a transmission electron microscope and an electron diffraction experiment. According to the method for detecting formation of the nanocrystals on the 690 high-strength steel surfaces, the nanocrystals can be formed on the 690 high-strength steel surfaces through the extreme plastic strain carried out by adopting the process parameter exceeding the minimal process parameter for forming the nanocrystals on the 690 high-strength steel surfaces; detection is carried out without destroying the 690 high-strength steel surfaces; and the method is suitable for the practical production process.

Description

technical field [0001] The invention relates to a material detection method, in particular to a detection method for forming nanocrystals on the surface of 690 high-strength steel. Background technique [0002] With the continuous growth of population and the continuous consumption of onshore oil and gas resources, the ocean has become the main field of oil and gas development in the world. Offshore platform is a comprehensive offshore engineering equipment integrating oilfield exploration, oil and gas processing, power generation, heating, storage and transportation of crude oil products, and personnel residence. It is a working base for subsea oil and gas exploration and exploitation. At present, the world's offshore oil and gas development has shown a tendency to enter the deep sea and the polar regions, which puts forward higher requirements for the comprehensive performance of offshore platform steel. In addition to high strength, high toughness, fatigue resistance, and...

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a detection method for the formation of nanocrystals on the surface of 690 high-strength steel, which is used to solve the problem of long inspection period, damage to the surface of the material, large chance, and measurement of crystals in the existing detection technology of nanocrystals on the surface of 690 high-strength steel. Technical problems with large particle size errors

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