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Neutron diffraction method for welding residual stress of duplex stainless steel thick plate

A duplex stainless steel, residual stress technology, applied in force/torque/work measuring instruments, material analysis using wave/particle radiation, measuring devices, etc., can solve the problem of not being able to effectively improve the efficiency of neutron diffraction testing of thick plate residual stress And other issues

Active Publication Date: 2018-09-04
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

However, due to the limitation of resolution and opening time, these two methods cannot effectively improve the efficiency of neutron diffraction testing of residual stress of thick plates

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  • Neutron diffraction method for welding residual stress of duplex stainless steel thick plate
  • Neutron diffraction method for welding residual stress of duplex stainless steel thick plate
  • Neutron diffraction method for welding residual stress of duplex stainless steel thick plate

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Embodiment Construction

[0061] At present, the neutron diffraction test in my country only tests the macroscopic residual stress of single-phase materials, and there is no clear calculation and test method to realize the residual stress test of duplex stainless steel by neutron diffraction. Usually, the method of testing the ratio of two phases, such as EBSD and other electron microscope observation methods, can only realize the phase ratio evaluation of a certain section, and the wide-angle XRD can only realize the phase ratio test of a specific volume range, which is difficult to accurately measure by other methods The ratio of the two phases within the canonical volume in a neutron diffraction test. In general, increasing the gauge volume and test time is a common method for testing the residual stress of thick plates using neutron diffraction. However, the maximum size of the specification volume is limited by the resolution required by the test, and the test time cannot be effectively increased ...

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Abstract

The invention discloses a neutron diffraction method for welding residual stress of a duplex stainless steel thick plate. The method comprises the following steps: determining stress testing crystal faces in different directions and a wavelength changing manner, so that a penetration depth of the neutron in the duplex stainless steel thick plate is increased, and testing time and testing errors are reduced; accurately calculating a two-phase ratio in a standard volume of the neutron diffraction test by virtue of transformation of diffraction peak intensity; and simultaneously testing two-phasestresses under specific equipment and diffraction conditions. According to the method disclosed by the invention, the penetration depth of the neutron can be effectively improved by virtue of a variable wavelength manner; the residual stress time of the duplex stainless steel thick plate in the neutron diffraction test can be reduced; the testing error of the residual stress of the duplex stainless steel thick plate can be reduced; the two-phase ratio in the standard volume can be accurately calculated by utilizing data of the diffraction peak intensity obtained by the neutron diffraction; and the influence produced by micro stress caused by two-phase performance mismatching is clear, and macro welding residual stress distribution of the duplex stainless steel is accurately calculated.

Description

technical field [0001] The invention relates to the technical field of neutron diffraction testing of welding residual stress, in particular to the neutron diffraction testing technology of welding residual stress of duplex stainless steel thick plates. Background technique [0002] Because duplex stainless steel contains austenite (fcc) and ferrite (bcc) duplex structure, it takes into account the excellent toughness and welding performance of austenitic stainless steel and the high strength and chlorine resistance of ferritic stainless steel. Chemical stress corrosion and other properties. These advantages make duplex stainless steel develop rapidly as a weldable structural material, and become a steel grade alongside austenitic, ferritic and martensitic stainless steel. Nowadays, as an important engineering material, duplex stainless steel has been widely used in petroleum, natural gas, chemical industry and papermaking, and has huge potential in emerging green energy an...

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Application Information

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IPC IPC(8): G01N23/207G01L5/00
CPCG01L5/0047G01N23/2073
Inventor 蒋文春万娱李建孙光爱涂善东赵旭凌祥黄娅琳
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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