Measurement method for effective grain size of structural steel with complex microstructure

A technology of grain size and microstructure, applied in the field of measuring the effective grain size of steel with complex microstructure, can solve the problem that the effective grain size threshold is difficult to measure, and achieve the effect of intuitive and convenient measurement.

Active Publication Date: 2014-01-22
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

[0004] In order to solve the above technical problems, the present invention provides a method for measuring the effective grain size of structural steel with complex microstructure. Solve the problem that the effective grain size threshold of complex microstructure structural steel is difficult to measure due to the diversity and complexity of the structure

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  • Measurement method for effective grain size of structural steel with complex microstructure
  • Measurement method for effective grain size of structural steel with complex microstructure
  • Measurement method for effective grain size of structural steel with complex microstructure

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Embodiment Construction

[0039] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0040] The materials used in the embodiment are X80 grade large deformation straight seam submerged arc welded pipeline steel pipes.

[0041] Sample interception: use wire cutting method to intercept 10×5×3(mm 3 ) size sample, when measuring, the long side of 10mm is parallel to the RD direction of the sample coordinate system, the short side of 5mm is parallel to the TD direction of the sample coordinate system, and the short side of 3mm is parallel to the ND direction of the sample coordinate system (see attached Figure 5 ). The measuring surface is the surface perpendicular to the TD direction, called the TD surface, and the measuring surface size is 10×3(mm 2 ).

[0042] Use No. 600 water sandpaper to polish each section of the sample, and use No. 600, No. 800, No. 1000, No. 1200, No. 1500, No. 2000 water sandpaper t...

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Abstract

The invention relates to a measurement method for the effective grain size of structural steel with a complex microstructure. The method comprises the following steps: acquiring a crystal diffraction pattern by using EBSD; measuring misorientation of crystal boundaries through the diffraction pattern and drafting a misorientation distribution curve chart; calculating threshold values of an effective grain size based on the misorientation distribution curve chart; and measuring transversal or longitudinal space between misorientation of the threshold values of the effective grain size and subjecting space data to statistical treatment so as to obtain average space between misorientation of average threshold values, wherein the average space is the effective grain size of a measured material. According to the invention, misorientation between crystal grains is used as a standard for measurement of the effective grain size, a prediction method for the threshold values of the effective grain size is brought forward, and it is convenient to formulate the threshold values of the effective grain size according to specific conditions of the material.

Description

technical field [0001] The invention relates to the field of grain size measurement, in particular to a method for measuring the effective grain size of structural steel with complex microstructure. Background technique [0002] In order to improve the strength and toughness of materials, steel materials are often designed to have complex microstructures with multiple phases or multiple tissue types. The soft phase and the hard phase in the material guarantee the good plasticity and strength of the material respectively, and the soft and hard phase cooperate with each other to make use of a large number of movable dislocations and tortuous grain boundaries in the structure, so that the material has good crack arrest performance. Due to the inconspicuous characteristics of various structures in this type of material, the shape of the grain is very irregular, the grain boundary is not clear, and the outline of the grain is difficult to distinguish, which brings great difficult...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N23/20
Inventor 李洋孟利张伟卫张继明吉玲康池强李炎华
Owner BC P INC CHINA NAT PETROLEUM CORP
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