Рідкофазна обробка кондукційним струмом ливарного силуміну АК7пч з підвищеним вмістом заліза
The aim of the work is to determine the main factors of electric current treatment of melt of a hypo-eutectic silumin with an increased Fe content for ensuring such a morphology of its phases that does not reduce the mechanical properties of the casting. Numerical modeling of processes in conductive...
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| Date: | 2023 |
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| Main Authors: | , , , , , , |
| Format: | Article |
| Language: | Ukrainian |
| Published: |
Physico-technological Institute of Metals and Alloys
2023
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| Subjects: | |
| Online Access: | https://www.metalsandcasting.com/index.php/mcu/article/view/76 |
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| Journal Title: | Metal and Casting of Ukraine |
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Metal and Casting of Ukraine| Summary: | The aim of the work is to determine the main factors of electric current treatment of melt of a hypo-eutectic silumin with an increased Fe content for ensuring such a morphology of its phases that does not reduce the mechanical properties of the casting.
Numerical modeling of processes in conductive electric current treatment of a melt was based on the fact that the processing of metal melt by fields of different physical nature (energy treatment), a complex of processes is formed that are multifactorial, multifunctional and multiple purpose. Therefore, this influence has all the criterions of a multiphysical one. On the one hand, the energetic influence makes it possible to obtain a complex of positive effects, in contrast to the reagent treatment, which acts selectively. On the other hand, it becomes much more difficult to simulate treatment processes in order to find its modes that allow obtaining a positive result. For that reason, the problem of finding a favorable combination of multiphysical factors of the electric current influence on a silumin melt with an increased Fe content under conditions when the energy fields cooperative action that are generated in the melt has signs of an extremum is considered topical. It is shown that these necessary conditions are the defined value of the dose of the energy density, which is introduced into the melt and the electrode system with parallel electrodes which has a different immersion depth and insulated lateral surface. The efficiency of these conditions has been experimentally confirmed. As a result of conductive electric current treatment of the liquid state of silumin which contained of Fe up to 2.6 % the primary coarse b-phase of Fe is completely eliminated. In this case, the ultimate strength σв reaches the value determined by the standard (DSTU 2839-94). With a Fe content of up to 3.4 %, the b-phase of Fe is substantially eliminated, σв increases almost 3 times, but the standard value is not reached. |
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