A method for measuring the critical strain of crack propagation in the corner of continuous casting slab

A critical strain, corner crack technology, applied in the direction of applying stable tension/pressure to test the strength of materials, measuring devices, instruments, etc., to achieve the effect of accurate test results and simple test process
CN112834339BActive Publication Date: 2022-05-20NORTHEASTERN UNIV LIAONING
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
NORTHEASTERN UNIV LIAONING
Publication Date
2022-05-20

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Abstract

The invention relates to a method for measuring the critical strain of crack propagation at the corner of a continuous casting slab, which belongs to the technical field of continuous casting. The method is as follows: first take samples from the continuous casting slab, and set a reasonable notch depth and angle to prefabricate cracks. Afterwards, the temperature field at the corner of the slab in the continuous casting process is simulated, the crack sensitive area is judged, and the heating system and deformation speed are determined. Finally, an in-situ tensile test was carried out in combination with the actual strain rate in the crack-sensitive area to dynamically observe and analyze the microscopic deformation morphology and fracture mechanism of the material, and record the changes in the metallographic structure during stretching in real time. The critical strain for crack growth at the corner is determined by combining the tensile length when crack growth occurs and the stress-strain curve obtained in the test. This method provides a method for measuring the critical strain of crack propagation at the corner of the continuous casting slab, which is more universal, not limited by the composition, the test process is simple, and the test results are accurate.
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Description

technical field

[0001] The invention relates to the technical field of continuous casting, in particular to a method for measuring the critical strain of crack propagation at the corner of a continuous casting slab. Background technique

[0002] Cracks are one of the main quality problems of continuous casting slabs, and cracks account for about 50% of all kinds of defects. In the continuous casting process, microalloying elements such as Nb, V, Ti in steel form fine dispersed carbides, nitrides and carbonitrides with C and N, and form thin film ferrite at austenite grain boundaries or grain boundaries. Particles precipitate out, which makes the high-temperature thermoplasticity of steel worse, and cracks are prone to occur on the surface of continuous casting slabs, especially the incidence of transverse cracks and transverse cracks at corners is significantly higher than that of ordinary steel slabs. During the continuous casting process, the corners of the slab are coole...

Claims

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