In-situ heating hot crack test device

Abstract

The invention discloses an in-situ heating hot crack test device. The device comprises a furnace body, a stretcher, a connecting rod, a stress sensor, a test rod, a thermocouple, a thermal insulationlayer, a magnetic field coil, a heating ring, an Al2O3 crucible, a base, a connecting chuck and a water-cooled chuck; the base is arranged at the outer bottom of the furnace body; a stretcher rail bracket is arranged under the stretcher, and the stress sensor is connected to the stretcher through the connecting rod; the water-cooled chuck is clamped at the right end of the test rod, and the test rod is placed in the Al2O3 crucible, and is coaxial with the Al2O3 crucible; the heating ring, the magnetic field coil and the thermal insulation layer sequentially sleeve the crucible; and the thermocouple is pre-buried on the outer wall of the crucible. After the test rod is heated and melted, the stretcher is started, the temperature of the heating ring is adjusted, and the water flow rate of the water-cooled chuck is selected or the magnetic field coil is controlled to generate a magnetic field in order to obtain critical conditions for hot cracking of the test rod along different dendritegrowth directions or in an equiaxed crystal form at different cooling rates. The device can quantitatively and accurately study the hot cracking problem of metals in different grain forms.

Description

technical field [0001] The invention relates to the technical field of metal solidification such as casting and continuous casting, in particular to an in-situ heating thermal crack testing device. Background technique [0002] During the solidification process of the metal, there will be solidification shrinkage due to phase change and other reasons. As the solidification progresses, the volume of the metal will change. When it is in the mushy zone during the solidification process, the metal shrinkage is limited, and sometimes it will cause hot cracking of the casting. Therefore, understanding the hot cracking tendency of metal materials and quantitatively measuring the critical conditions for hot cracking (including: critical thermal stress, critical temperature, critical solid phase ratio, critical structure composition, etc.) have become the key to guiding actual production. [0003] Hot cracking of metals and their tendency: During the solidification process, the metal...

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Problems solved by technology

[0008] However, none of the above three methods can control the temperature gradient during solidification of molten steel, so the grain morphology studied is relatively simple.

Due to the constant change of the cooling rate and the large temperature difference between various parts of the pouring method, it is difficult to calculate the strain rate accurately, and it is impossible to quantitatively study the critical conditions of thermal cracking. Poor performance, low measurement accuracy

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