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Влияние условий плавки на выделение кислорода из порошка природнолегированного чугуна

Влияние условий плавки на выделение кислорода из порошка природнолегированного чугуна

Abstract

Temperature dependences of kinematic viscosity of naturally alloyed iron in a liquid state have been studied. Temperatures, the heating to which transforms the melt into a homogeneous state have been assigned. The polytherm has a complicated type showing the presence of several stages of structural transformations. It was established that the maximum temperature of the heating melt during the experiment greatly affects the type of the polytherm hysteresis. Based on the quasi-chemical model of micro-inhomogeneous melt structure, physical substantiation of transformations occurring during heating and cooling of liquid metal was offered. The results obtained were used in the production of powders from naturally alloyed iron. Pilot melting during which liquid metal was heated above and below its structural reorganizations was carried out. In addition, the temperature of liquid metal spraying by nitrogen was varied. The influence of the melting regimes of naturally alloyed iron on the oxygen content in the obtained powder was studied. Research by the method of vacuum melting using the equipment “O-N-mat 822” showed that the process of oxygen deposition from powder particles has a complicated type. It was found out that the oxygen content in iron powder depends on the particle size and conditions of melt preparation to spraying. Formation of the homogeneous condition during melting leads to the decrease of oxygen concentration in the powder and to the change of its deposition spectrum. It turns out that in such melts oxygen is in a solid solution or is bound in iron oxides.

Изучены температурные зависимости кинематической вязкости природнолегированного чугуна в жидком состоянии. Установлены температуры, нагрев до которых переводит расплав в гомогенное состояние. Политерма имеет сложный характер, свидетельствующий о наличии нескольких этапов структурных превращений. Установлено, что температура максимального нагрева расплава в ходе опыта существенно влияет на вид гистерезиса политерм. На основании квазихимической модели микронеоднородного строения расплава предложено физическое обоснование происходящих при нагреве и охлаждении жидкого металла превращений. Полученные результаты использованы при получении порошка природнолегированного чугуна. Проведены опытные плавки, в которых жидкий металл нагревали выше и ниже интервала его структурных перестроек. Кроме этого варьировали температуру распыления жидкого металла азотом. Изучено влияние условий плавки природнолегированного чугуна на содержание кислорода в полученном порошке. Исследования методом вакуум-плавления на установке «O-N-mat 822» показали, что процесс выделения кислорода из частиц порошка носит сложный характер. Установлено, что содержание кислорода в порошке чугуна зависит от размера частиц и условий подготовки расплава к диспергированию. Формирование в ходе плавки гомогенного состояния приводит к снижению концентрации кислорода в порошке и изменению спектра его выделения. Оказывается, что в таком расплаве кислород находится в твердом растворе или связан в оксиды железа.

Keywords

ПРИРОДНОЛЕГИРОВАННЫЙ ЧУГУН,РАСПЛАВ,ФИЗИКО-ХИМИЧЕСКИЕ СВОЙСТВА,СОДЕРЖАНИЕ КИСЛОРОДА,NATURALLY ALLOYED IRON,MELT,PHYSICO-CHEMICAL PROPERTIES,OXYGEN CONTENT

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    This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
Average
Average
gold