Search academic texts

Information × Registration Number 0217U000744, 0115U003322 , R & D reports Title Research of physical and chemical processes of aluminium alloy interaction with the modifiers in conditions of pulse stressing and development of efficient complex technological methods of hypereutectic silumins modification popup.stage_title Head Tsurkin Volodymyr Mykolayovych, Registration Date 24-02-2017 Organization Institute of Pulse Research and Engineering popup.description2 The object of research are processes of treatment of silumins whith different modes of electric current. The dependences of positive structural changes in the melt of the Al-Si system under the conductive electric current treatment (CECT) in pulsed mode were defined. The features of the distribution of the electric field in the liquid metal homo- and heterogeneous system and in nucleation are defined. Experimentally, using a pulsed high-voltage and low-voltage power sources, it is shown that a low voltage bipolar pulse repetition frequency of 24 to 40 Hz and current amplitudes 800 A most rational for practical use. When comparing the energy consumption and efficiency of CECT in pulsed mode has almost the same effect on the change of quantitative structure-modifying treatment as ligature AlTiB, but after CECT cast structure becomes homogeneous. When the melt was treated in the form of different cross section, the CECT, unlike melt's treatment of modifiers allows to obtain substantially the same structure parameters in different thickness sections of the casting. Numerically, it is shown that on the background of the electric field distribution in the macro-melt volume distortion of its electric potencial at the microscopic inhomogeneities plays a key role in changing the thermodynamic characteristics of the system. This leads to a rearrangement of the melt crystallization ability. Numerically, the possibility of management with the help of CECT the process of redistribution of the solid phase nucleation in the melt due to "Crystal Rain" effects. This effect contributes its share in the formation of positive changes in the cast metal structure Product Description popup.authors Іванов А.В. Гумененко М.К. Дьогтєв Ю.Н. Федченко Н.А. Харитонова Т.Г. Цуркін В.М. Череповский С.С. Честних М.В. popup.nrat_date 2020-04-02 Close