Detection method for laser induced micro-pits surface nanocrystallization applied to marine engineering platform
A technology of laser induction and detection method, applied in the direction of material analysis using radiation diffraction, etc., can solve problems such as corrosion fatigue fracture, threat to the safety of offshore platforms, corrosion damage, etc., and achieve the effect of grain size refinement
Active Publication Date: 2019-05-07
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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[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 detection method for laser induced micro-pits surface nano-crystallization, which can be applied to a marine engineering platform. The method comprises using E690 high strength steel as a base material to prepare test pieces of a marine engineering platform lifting mechanism by a laser shock strengthening process; measuring the residual stress on the laser shock area surface of the test pieces of the marine engineering platform lifting mechanism; calculating the mean and the variance of the residual stress in different directions in each set of the test pieces of the marine engineering platform lifting mechanism; drawing a curve graph which reflects that the mean and the variance change over the number of laser shock time; and through transmission electron microscopy and electron diffraction experiments, verifying that the residual stress values in three directions are approximately equal to each other under the laser power of 7.96 GW / cm2; the variance is 182; the FWHM value is 2.78 degree; the number of laser shock time is 2; and nano-crystal is formed on the surface of the E690 high strength steel. According to the detection method for the laser inducedmicro-pits surface nano-crystallization applied to the marine engineering platform, the invention performs exceeding plastic strain by adopting a minimum laser shock strengthening parameter which exceed the parameter for the formation of nano-crystal on the surface of the E690 high strength steel, so that nano-crystal may be formed on the surface of the test pieces of the marine engineering platform lifting mechanism prepared from the E690 high-strength steel; the surface of the E690 high strength steel material does not need to be damaged; the method is suitable for the real 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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IPC IPC(8): G01N23/20
Inventor 曹宇鹏葛良辰施卫东花国然王恒谭林伟王振刚仇明杨聪张悦曹晨王帅
Owner NANTONG UNIVERSITY