Method for Determination of Dislocation Density of Large Size Block Iron and Steel Materials

Abstract

The invention provides a determination method for dislocation density of large-size block iron and steel materials, which comprises the following steps of 1 preparing a standard test sample; 2 testing the standard test sample, determining magnetization rate x scale and coercive force Hc scale of the test sample, and further determining constant c scale of a standard test sample; 3 testing the standard test sample, determining the dislocation density rho scale of the standard test sample, and further determining the values of a coefficient b and a coefficient K; 4 preparing a test sample I to be tested; 5 testing magnetization rate x I and coercive force Hc I of the test sample; 6 jointly establish a formula x=c / Hc3 and a formula c=b+Krho, and obtaining the dislocation density rhoI; and repeating step 4-step 6 when testing a test sample II to be tested made of the same material and has the same preparation method with the test sample I to be tested. The determination method for the dislocation density of large-size block iron and steel materials has the advantages that a test result can reflect microscopic distribution of the dislocation density inside the test sample, and the method is simple, fast, easy to grasp and wide in use range.

Description

Technical field [0001] The invention belongs to a method for measuring the dislocation density of iron and steel materials, more specifically, it is a method for measuring the magnetic parameters of large-size bulk iron and steel materials by electromagnetic method, and then calculating the dislocation density. Background technique [0002] Dislocation density is an important microscopic characterization parameter in materials science, which is closely related to the mechanical properties, magnetic properties, and electrical properties of materials. According to reports in the existing literature, the methods for measuring dislocation density in steel materials currently mainly include grid method, erosion method, and X-ray linear analysis method. [0003] The grid method is usually to make the sample into a metal film with a diameter of about Ф3mm and a thickness of about 100-200nm, take a transmission electron microscope picture, and then measure the dislocation density with the ...

AI Technical Summary

Problems solved by technology

Its disadvantage is that the X-ray line shape analysis method requires a deep understanding and knowledge of the X-ray line shape analysis theory, the analysis process is more complicated and difficult to master, and the X-ray irradiation area is still relatively small

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