A kind of simulated ultrafast cooling test device and test method

Abstract

The invention discloses a simulation ultrafast cold test device and a simulation ultrafast cold test method. The simulation ultrafast cold test device consists of a vacuum tank, a U-shaped groove, a chunk, a clamping fixture, a spray nozzle as well as a support thereof, a gas storage tank, a cold water tank and a water pump. The simulation ultrafast cold test method particularly comprises the steps of arranging an electromagnetic valve installed on a wedge-shaped block in an open state; drawing up and running a test program; taking a test sample as a resistor for electrifying and heating; after heat deformation, cooling the test sample fast for a period of time before the target temperature; starting up the water pump and a gas valve which controls the gas flowing of the gas storage tank, so as to enable cooling water to run in a pipeline and cooling gases to flow out from the gas storage tank, and control the particular advanced time and the sequence for starting up the water pump and the gas valve; and closing the water pump and the gas valve which controls the gas flowing of the gas storage tank. The ultrafast cold simulation device provided by the invention is scientific and reasonable in design, is simple, convenient and feasible to control, improves the cooling capability through three modes of heat transfer, convection as well as radiation, achieves the actual ultrafast cooling technology requirement of simulation production, and provides an effective means for the application and research of the ultrafast cold technology in actual production.

Description

technical field [0001] The invention belongs to the technical field of thermal simulation tests, and in particular relates to a simulated ultrafast cooling test device and a test method. Background technique [0002] Ultra-rapid cooling technology is based on the provision of work-hardened austenite in the modern continuous rolling process, with ultra-rapid cooling as the core, ultra-rapid cooling of post-rolling hardened austenite and termination of cooling at the dynamic phase transformation point, followed by Slower cooling control. The application of the rolling cooling process of this technology reduces micro-alloying elements and alloying elements, and avoids low-temperature and high-pressure rolling. The obtained steel materials have the characteristics of excellent performance, resource-saving and energy-saving. [0003] The general unit of Gleeble-3800 thermal simulation testing machine consists of a movable U-shaped groove in a vacuum tank, a sample, an anvil, and...

AI Technical Summary

Problems solved by technology

The disadvantage of this device is that the pressure and flow rate of the cooling medium after being divided is limited, the increase in the cooling speed of the sample is limited, and because it occupies a large space, it is not suitable for application in general units.

[0005] The chuck device proposed in the patent "A Thermal Simulator Chuck Device" (Patent No.: ZL201120088251.1) achieves the effect of rapidly cooling the sample through heat radiation and heat conduction, but it is difficult to achieve rapid cooling only through heat radiation and heat conduction. The slow cooling function immediately after cooling cannot simulate the ultra-fast cooling process. This patent does not propose a cooling control method for simulating ultra-fast cooling technology

[0006] The ultra-fast cooling technology requires precise control of the starting cooling temperature and the final cooling temperature, and the cooling time is only a short period of 1-2s. In this control process, it is often required to wait at a certain temperature after rapid cooling. Although the above-mentioned sample cooling device can realize the rapid cooling of the sample, it does not propose the control of the precise time of cooling start and end. During cooling, the delay effect of the control often delays the implementation of the cooling action, resulting in untimely cooling. When it is necessary to wait for the temperature, it is often due to the delay in ending the cooling action, resulting in cooling overshoot

However, the realization of ultra-fast cooling technology is often completed in a very short period of time. If the conventional control method is still used, it will inevitably affect the accuracy of experimental parameter control and affect the subsequent tissue inspection work.

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