Method for evaluating grain structure uniformity in alloy steel forgings

Abstract

The invention provides a method for evaluating the uniformity of grain structure in alloy steel forgings. The specific implementation steps are as follows: first, perform a hot compression test on the alloy steel forgings on a thermal simulation testing machine; according to the obtained flow stress curve, establish Constitutive model of alloy steel forgings; according to the obtained compressed samples, metallographic tests of alloy steel forgings are carried out, and a dynamic recrystallization related model of alloy steel forgings is established; then, dynamic recrystallization of obtained alloy steel forgings is formed after forming The integral number distribution is divided into the fully recrystallized area and the incompletely recrystallized area, and the evaluation function M of the uniformity of the grain structure in the fully recrystallized area and the evaluation function K of the uniformity of the incompletely recrystallized grain structure are established; finally, according to the value of M or K The value of the value is used to judge the uniformity of the grain structure. The smaller the function value, the better the grain structure uniformity, and vice versa. The invention provides a reference basis for formulating, optimizing and quantitatively evaluating the alloy steel forming process.

Description

technical field [0001] The invention relates to the field of evaluation of the uniformity of grain structure of forgings, in particular to a method for evaluating the uniformity of grain structure in alloy steel forgings. Background technique [0002] With the vigorous development of society and the advancement and innovation of science and technology, new alloy steels have become the best choice for many industrial applications due to their excellent properties, such as high strength, ultimate tensile strength, high temperature resistance and good formability and weldability. It is widely used in automobiles, high-rise buildings, automobiles, construction machinery, oil and gas and other manufacturing fields all over the world. Therefore, many products on the market can be made of alloy steel forgings. [0003] There is a close relationship between the comprehensive properties of alloy steel forgings and the microscopic grain structure inside the material. The uniformity o...

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Problems solved by technology

[0004] Aiming at the problem of non-uniform grain structure of alloy steel forgings, the present invention provides a method for evaluating the uniformity of grain structures in alloy steel forgings, so as to realize a reasonable evaluation of the overall and local grain structure uniformity of alloy steel forgings. Quantitative evaluation, so as to provide a reference for formulating, optimizing, and quantitatively evaluating the forming process of alloy steel forgings

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