Method for measuring interfacial heat transfer coefficient of rapid cooling process of steel

Abstract

The invention relates to a method for measuring interfacial heat transfer coefficient of the rapid cooling process of steel. The method includes the steps: 1 spot-welding a thermoelectric couple on the surface of a workpiece and connecting the thermoelectric couple to a temperature acquisition module; transmitting tested temperature change information to the temperature acquisition module by the aid of the thermoelectric couple when the workpiece is cooled; 3 reading temperature change data of a surface point by the aid of the temperature acquisition module; 4 obtaining the interfacial heat transfer coefficient of the cooling process by means of an interfacial heat transfer coefficient verifying function of heat treatment software; 5 using the obtained interfacial heat transfer coefficient for simulating change of a temperature field of the workpiece in the cooling process, computing the temperature change of a surface testing point, and comparing the temperature change with actual measurement results until computed results are well matched with actual measurement results; and 6 using the interfacial heat transfer coefficient obtained in the step 5 for simulating deformation of the workpiece in the cooling process until computed results are well matched with deformation tendency of actual measurement results. Therefore, the problem of inaccuracy of interfacial heat transfer coefficient is solved.

Description

technical field [0001] The invention relates to a method for determining the interface heat transfer coefficient, in particular to a method for determining the interface heat transfer coefficient in the rapid cooling process of steel. Background technique [0002] Quenching is a commonly used heat treatment process and an effective way to strengthen metal materials. However, the problem of material deformation caused by quenching has long plagued manufacturers and researchers. This is mainly because there are many reasons that affect the quenching deformation. In addition to the chemical composition, size and shape of the material, it is also closely related to the heat treatment process parameters. Recently, numerical simulation technology has played an increasingly important role in the study of heat treatment deformation of metal materials. Among them, the heat transfer behavior between the workpiece and the cooling medium during the quenching process not only affects t...

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Problems solved by technology

[0004] In view of the above problems, the purpose of the present invention is to provide a method that is easy to operate and can accurately measure the interface heat transfer coefficient of the rapid cooling process of steel, so as to solve the problem that the interface heat transfer coefficient of the workpiece existing in the prior art is difficult to be accurate during the rapid cooling process. identified problem

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