Method for eliminating temperature gradient in metal strip sample heat treatment test

Abstract

The invention relates to a method for erasing temperature gradient in mental plate with sample heat treating experiment, which is characterized in that it adds infrared radiation heating means based on the mode of directly using the resistance to heat; it fixes infrared heating apparatus on the two sides of the sample near the clamp, and uses the infrared radiation energy of the infrared heating apparatus to compensate the heat leaked by heat transmitting; it separately controls the directly resistance heating and the infrared radiation heating.

Description

technical field [0001] The invention relates to the technical field of metal heat treatment, in particular to a method for eliminating temperature gradients in heat treatment tests of metal strip samples. Background technique [0002] At present, many material physics simulation equipment, such as thermal simulation test machine, cold-rolled strip continuous annealing simulation test machine, etc., in order to achieve the purpose of rapid metal heating, usually use direct resistance heating, that is, use a heating transformer to provide a certain voltage for the sample. Make a large current pass through the sample, and use the resistance of the sample to achieve the purpose of heating. Since the sample is clamped between two water-cooled fixtures, a large temperature gradient is likely to occur due to heat conduction ΔT = ( 2 x L ...

AI Technical Summary

Problems solved by technology

In the test of the continuous annealing simulation test machine for cold-rolled strip steel, it is often required to carry out the stamping performance test on the plate sample after heat treatment. According to the national standard, the minimum size of the plate sample for the stamping performance test is 300×300mm, so that It is required that the uniform temperature zone length of the sample should be at least 300mm during the test of the cold-rolled strip steel continuous annealing simulation test machine. To achieve this purpose, only increase the length of the sample, such as when the allowable temperature gradient ΔT=±50℃ , the length of the sample should reach 1200mm. When the allowable temperature gradient ΔT=±20℃, the length of the sample should reach 1800mm; however, the test needs to be carried out in a vacuum or a certain protective atmosphere. After the length of the sample increases, the operation The volume of the box and the overall equipment increases, which increases the cost of the equipment and increases the cost of the test; even so, the temperature gradient in the uniform temperature zone is still relatively large, which affects the accuracy of the test

For example, the strip steel continuous annealing simulation test machine produced by voestalpine Company allows the maximum length of the sample to be 600mm, and the length of the uniform temperature zone is difficult to meet the requirements of the stamping performance test. The equipment is very large and expensive

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