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Research method for microcosmic and macroscopic crack germination and expansion of continuous casting special-shaped blank

A special-shaped blank and macroscopic technology, which is applied in the fields of instruments, electrical digital data processing, geometric CAD, etc.

Pending Publication Date: 2020-03-31
NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology

There are few studies on the crack initiation and propagation process in the production process of profiled billets, and based on the stress genetic characteristics of the continuous casting billet shell, there are almost no studies on the establishment of thermal-mechanical coupling models to analyze crack initiation and propagation, especially for cracks in crystal models. Extending the analog aspect is even more negligible

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  • Research method for microcosmic and macroscopic crack germination and expansion of continuous casting special-shaped blank
  • Research method for microcosmic and macroscopic crack germination and expansion of continuous casting special-shaped blank
  • Research method for microcosmic and macroscopic crack germination and expansion of continuous casting special-shaped blank

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Embodiment 1

[0045] A research method for the initiation and propagation of micro and macro cracks in continuous casting profiled billets, including the following steps:

[0046] Step 1) Combine figure 1 It can be seen that the thermal-mechanical coupling analysis in the continuous casting mold of the profiled billet is based on the genetic characteristics of the continuous casting shell stress, that is, considering the continuous inheritance of the stress field in the continuous casting, so that the defects generated in the upper part of the mold can be reflected in the lower part. At the same time, considering the fact that the change of the slab body when the loading temperature and the static pressure of the molten steel are applied, the thermal-mechanical coupling model of the slab solidification in the mold is established by using the multi-load step method. In the case of considering the taper and the air gap, the temperature simulated by ANSYS field and stress field, calculate the ...

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Abstract

The invention discloses a research method for microcosmic and macroscopic crack germination and expansion of a continuous casting special-shaped blank, which comprises the following steps of: simulating a temperature field and a stress field of the special-shaped blank in a crystallizer through ANSYS so as to find out a position where a casting blank crack is most easy to initiate and expand; then, adopting ABAQUS finite element software and an extension finite element method, and through a high-temperature fracture experiment, simulating the extension behavior of cracks on the surface of thecasting blank based on XFEM; and finally, simulating the initiation and expansion behaviors of crystal cracks under a microscopic condition by taking the stress and displacement of the crack tip unitcalculated in the previous step as boundary conditions. Optimization suggestions on production process conditions can be provided to reduce defects, especially cracks, on the surface of the casting blank, and the problem that the surface cracks of the special-shaped blank are difficult to effectively solve in the current engineering is solved.

Description

technical field [0001] The present invention relates to metal continuous casting, specifically to the research method of microscopic and macroscopic crack initiation and expansion of continuous casting profile billets. Background technique [0002] In the continuous casting process, various defects are inevitably produced, and the proportion of slab cracks in various defects is as high as about 50%. This problem is even more serious due to the complex cross-sectional shape of the profiled billet. The generation of slab cracks seriously affects production efficiency and product quality. In order to improve this situation, many scholars have done a lot of work on the reasons for the formation of cracks on the surface of continuous casting slabs and their control methods. The research on the influence of cracks on the billet surface has proposed the use of progressive straightening technology for the continuous casting process equipment, and measures such as protecting the ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/20G06F30/17G06F111/10G06F119/14
Inventor 陈伟王宝祥陈颖马劲红杨改彦李耀
Owner NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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