Перераспределение водорода между фазами при кристаллизации алюминия и его сплавов

Abstract

Рассмотрено перераспределение водорода между фазами при кристаллизации алюминия и его сплавов. Получены выражения для расчета текущих значений в процессе затвердевания алюминия и его сплавов концентраций водорода в пограничном диффузионном слое, на фронте кристаллизации, в объеме оставшегося расплава, эффективного коэффициента распределения водорода, толщины пограничного диффузионного слоя, коэффициента массопереноса водорода, критерия Стэнтона. Результаты исследований можно применять на практике с целью оптимизации технологического процесса получения качественных отливок из алюминия и его сплавов.

Questions which are related to the process of redistribution of hydrogen between the phases during crystallization of aluminium and its alloys are examined in the article. A research result is: development of theoretical bases of process of redistribution of hydrogen between the phases during crystallization of aluminium and its alloys. As a scientific novelty the simple are first got and comfortable for practical application of expressions for the calculation of current values in the process of thermosetting of aluminium and his alloys of concentrations of hydrogen in a boundary diffusive layer, at the front of crystallization, in the volume of remaining fusion, effective coefficient of distributing of hydrogen, thickness of boundary diffusive layer, coefficient of mass transfer of hydrogen, criterion of Stentona. The developed theoretical bases of process of redistribution of hydrogen between the phases during crystallization of aluminium and its alloys allow to analyse a conduct at thermosetting of any admixture, when its initial maintenance in fusion exceeds the limit of solubility in a hard phase. Practical value of the got results can be utillized with the purpose of optimization of technological process and more effective use of expensive equipment for the receipt of the high-quality foundings from an aluminium and its alloys.