Abstract
The methodology of calculating parameters of the primary and secondary non-metallic inclusion formation in thermite alloys is offered. The regularities of the growth time of non-metallic inclusion in the form of corundum depending on its size, mass and quantity are analysed. It is shown that in the thermite alloy obtained by self-propagating high-temperature synthesis, the average size of corundum inclusions, surrounding the heterogeneous inclusions of chromium carbide, is 15.4 μm. It is shown that during the process of aluminothermic reactions of the SHS process a significant number of small inclusions of corundum is formed. It is shown that the alumina particles are dissolved in the alloy and they are the centers of crystallization and play the role of inoculating modifier.
Highlights
Today, one of the main indicators of metal quality and, correspondingly, the quality of final products is the contamination of non-metallic inclusions, and both the number of inclusions and their nature and physicochemical composition matter [1]
It is known that in order to obtain a dense SHS-material with high physical and mechanical characteristics, it is necessary to take into account the patterns of combustion of the reaction mixture, the formation of chemical and phase compositions of the final product, the crystallization behavior of the alloy [31]
As it is noted in [32] during the formation of a thermite alloy layer of the Fe-Cr-C system on a metal-based SHS process, the layer formation zone is characterized by macrostructure stability and positive effect of oxidative nonmetallic inclusion in the form of corundum
Summary
One of the main indicators of metal quality and, correspondingly, the quality of final products is the contamination of non-metallic inclusions, and both the number of inclusions and their nature and physicochemical composition matter [1]. Non-metallic inclusions significantly reduce the technological and mechanical properties of steels, contributing to the formation of various defects. The author shows the influence of the non-metallic inclusions nature on the mechanism of microdestruction formation in steel under the different deformation conditions; and - inactive areas. The authors in [19] proposed measures to reduce the size and number of non-metallic inclusions in the cord steel. They used the method of estimating non-metallic inclusions, which was developed by the author [20]. The issue of calculating the parameters of formation of non-metallic inclusions is insufficiently studied, so it seems appropriate to propose a method of calculating the parameters of formation of non-metallic inclusions, as the primary as secondary in thermite alloys
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
