Determination method for 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 precisely, it is a method for calculating the dislocation density by measuring the magnetic parameters of large-scale block iron and steel materials by using an electromagnetic method. Background technique [0002] Dislocation density is an important microscopic parameter in material science, which is closely related to the mechanical properties, magnetic properties, and electrical properties of materials. According to the reports in the existing literature, the methods for measuring the dislocation density in iron and steel materials mainly include grid method, erosion method, X-ray line shape analysis method and so on. [0003] The grid method is usually to make the sample into a metal thin film with a diameter of about Ф3mm and a thickness of about 100-200nm, take a transmission electron microscope photo, and then measure the dislocation density...

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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 anal

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