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Laser-induced micro-pit surface nanoscale detection method applied to offshore platform

A technology of laser induction and detection method, which is applied in the direction of material analysis using radiation diffraction, measuring devices, and material analysis using wave/particle radiation, which can solve problems such as corrosion fatigue fractures, threats to the safety of offshore platforms, and corrosion damage. Reach the effect of grain size refinement

Active Publication Date: 2021-07-23
NANTONG UNIVERSITY
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Problems solved by technology

E690 high-strength steel is an important steel for marine engineering. Under the action of ocean tidal range, it is very prone to corrosion damage or even corrosion fatigue fracture, which will seriously threaten the safety of offshore engineering platforms.

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  • Laser-induced micro-pit surface nanoscale detection method applied to offshore platform
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  • Laser-induced micro-pit surface nanoscale detection method applied to offshore platform

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Embodiment Construction

[0027] In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the following will describe in detail with reference to the drawings and specific embodiments.

[0028] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", " The orientation or positional relationship indicated by "front", "rear", etc. is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, are constructed and operate in a particular orientation and therefore are not to be construed as limiting the invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and shou...

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Abstract

The invention provides a laser-induced micro-pit surface nanometerization detection method applied to an offshore platform, comprising the following steps: using E690 high-strength steel as the base material, and preparing a sample of the lifting mechanism of the offshore platform through a laser shock strengthening process; measuring the offshore platform The residual stress on the surface of the laser shock area of ​​the lifting mechanism sample; calculate the mean and variance of the residual compressive stress in different directions in the lifting mechanism samples of each group of offshore platform; draw the curve of the mean and variance with the number of laser shocks; Diffraction experiment, verified 7.96GW / cm 2 The residual stress in the three directions is approximately equal under the laser power of 182°, the FWHM value is 2.78°, the number of impacts is 2 times, and nanocrystals are formed on the surface of E690 high-strength steel; the present invention adopts the minimum laser shock that exceeds the surface of E690 high-strength steel to form nanocrystals The extreme plastic strain of the strengthening parameters can make the E690 high-strength steel prepare the offshore platform lifting mechanism sample to form nanocrystals without destroying the surface of the E690 high-strength steel material, which is suitable for the actual production process.

Description

technical field [0001] The invention belongs to the technical field of material detection, and in particular relates to a method for detecting the surface nanometerization of laser-induced micro pits applied to offshore platforms. 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...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N23/20G01N23/20008
Inventor 曹宇鹏施卫东花国然葛良辰王恒谭林伟王振刚仇明杨聪张悦曹晨王帅
Owner NANTONG UNIVERSITY
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