A test method for simulating slow cooling process

Abstract

The invention discloses a test method for simulating a slow cooling process. The test method comprises the following steps of: processing n samples into round bars with uniform lengths, welding a thermoelectric couple on one of the samples; packaging the sample on which the thermoelectric couple is welded and the other samples together by using a tantalum sheet according to a required cooling speed range, wherein the axes of the samples are parallel and two ends of the samplers are aligned; putting the samples between two pressure heads of a tester, and starting a hydraulic system for clamping; and vacuumizing, starting a heating system to heat and insulate the samples when the vacuum degree is up to 5-20Pa, and directly setting the temperature to be zero, so that the samples are naturally cooled along with the pressure heads, wherein a program still runs in the process, the actual temperature of the samples is collected, and the program run time in the cooling process is t=(3 / n)*(T-T1) / v. Accessories do not need to be added to the original device; the natural cooling phase-change process of the samples can reappear, and an experiment of simulating the slow cooling process is realized.

Description

technical field [0001] The invention relates to a test method for simulating a slow cooling process, and belongs to the technical field of heat treatment. Background technique [0002] Physical simulation in the field of materials and thermal processing is actually a simulation of the thermal / mechanical physical processes that materials undergo. At present, thermal / mechanical simulation experimental devices have high simulation ability and simulation accuracy, and with the demand for physical simulation technology, various types of thermal simulation experimental devices have come out. The thermal simulation device can be divided into single thermal simulation and full simulation device with mechanical simulation function according to the simulation function; according to the heating method, it can be divided into two categories: direct electric heating on the sample and high-frequency induction heating. [0003] Among them, the heating method of the Gleeble series thermal ...

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Problems solved by technology

Because the equipment has good control accuracy on temperature, it is easy to realize slow cooling process control, so there are few researches on the development of slow cooling simulation function

However, whether it is a rapid cooling process or a slow cooling process, the control of the cooling process is carried out according to the preset cooling path (mostly the cooling process simulation is carried out at a constant cooling rate), and it is impossible to heat the simulated sample. Control of the stochastic natural cooling process after

There is an isothermal phase transition process in the sample during the natural cooling process. If a constant cooling rate control is used to replace the natural cooling process, it will cause a large difference in the structure

[0004] After the sample is heated, the power can be cut off to achieve random natural cooling of the sample. However, since the indenter used to hold the sample on the thermal simulation testing machine has a certain thermal conductivity, the sample must obtain a higher cooling rate, especially When the size of the simulated sample is small (small-sized wire rod products), it is difficult to simulate the natural cooling process with a slow cooling rate. Therefore, in order to realize this type of cooling process simulation, it is necessary to find a simulation slow Test method for cooling process

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