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

A technology of interface heat transfer coefficient and rapid cooling, which is applied in the field of measuring the interface heat transfer coefficient in the rapid cooling process of steel, which can solve the problem that the interface heat transfer coefficient is difficult to accurately determine, and achieve the effect of accurate test results.

Active Publication Date: 2012-06-20
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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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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  • Method for measuring interfacial heat transfer coefficient of rapid cooling process of steel
  • Method for measuring interfacial heat transfer coefficient of rapid cooling process of steel
  • Method for measuring interfacial heat transfer coefficient of rapid cooling process of steel

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Embodiment

[0033] The present invention is used to test the interface heat transfer coefficient of the austenitic stainless steel notched disc in Fig. 3 1050°C water cooling, and simulate the temperature field and deformation of the notched disc after water cooling. As shown in Figure 3, the notched disc is a notched disc formed between the outer ring and the inner ring in the outer ring. The main reason for using the notched disc for the test is based on the following two points: one is the shape characteristics of the disc itself , it can be seen that the size of the disc increases continuously from the notch to both sides, which is excessively obvious, and deformation is easy to occur near the notch after water cooling; second, it is convenient to measure the deformation result. In this embodiment, a vernier caliper is used to directly measure the size of the notch, and then Just compare with the original size of the notch.

[0034] The temperature field change after the water cooling...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N25/20
Inventor 程柏松肖纳敏李殿中李依依
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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