Abstract
The article is devoted to study of the process of mold inoculation of high manganese steel castings using titanium carbonitride. Introduction considers basic principles, alloying and inoculation of casting alloys. Review of the papers on this topic made by native and foreign researchers was given. Conclusions were made on the materials presented in the studied papers, goals and tasks for studies were formed. Besides, in this part of the article relevance of the conducted researches was substantiated as well as practical significance for casters. The second part of the article describes routine of experiments. Materials involved when conducting experimental works were considered in details: charge materials, treatment agent, materials for foundry molds. Besides, there are also described the way to receive experimental cast products, methodology to determine thermal conditions for forming experimental models in foundry mold and regimen of thermal treatment. Herewith, methodology for conducting metallographical test was considered. The third part of the article mentions the results received during carrying out experimental works on mold inoculation using fine titanium carbonitride powder of high manganese steel castings. Influence of inoculation on the level of performance properties expressed via coefficients of abrasive wear and wear striking resistance was considered as well as change of the indicated peculiarities in relation to not inoculated alloy was evaluated. Besides, results of metallographical tests were given which allowed to substantiate change of the performance properties level of high manganese steel. Influence of thermal conditions of forming cast products was also evaluated, in particular speed of alloy cooling in foundry mold on the level of performance properties of inoculated high manganese steel. In final part of the article conclusions on the results of conducted researches were made as well as manufacturing recommendations were given for practical implementation of the work results to increase the level of performance properties of high manganese steel. Besides, recommendations on the most reasonable expenditure of titanium carbonitride powder ensuring receipt of the necessary characteristics of microstructure and as a consequence, increase of the level of performance properties were given.
Highlights
The article is devoted to study of the process of mold inoculation of high manganese steel castings using titanium carbonitride
Materials involved when conducting experimental works were considered in details: charge materials, treatment agent, materials for foundry molds
The third part of the article mentions the results received during carrying out experimental works on mold inoculation using fine titanium carbonitride powder of high manganese steel castings
Summary
Феоктистов Н.А., к.т.н., доцент кафедры технологий металлургии и литейных процессов Горленко Д.А., к.т.н., старший преподаватель кафедры технологий металлургии и литейных процессов. В третьей части приведены результаты, полученные в ходе проведения экспериментальных работ по внутриформенному модифицированию мелкодисперсным порошком карбонитрида титана отливок из высокомарганцевой стали. Рассмотрено влияние тепловых условий формирования литых изделий, в частности скорости охлаждения сплава в литейной форме, на уровень эксплуатационных свойств модифицированной высокомарганцевой стали. В заключительной части сформулированы выводы по результатам проведенных исследований, а также даны технологические рекомендации для практической реализации результатов работ с целью повышения уровня эксплуатационных свойств литых изделий из высокомарганцевой стали. С позиции сокращения угара дорогостоящих легирующих элементов и повышения эффективности всего процесса в целом, наиболее перспективной является технология внутриформенного модифицирования высокомарганцевой стали мелкодисперсным порошком карбонитрида титана [14 – 17]. Цель работы – исследование процесса внутриформенного модифицирования отливок из высокомарганцевой стали мелкодисперсным порошком карбонитрида титана. Для достижения поставленной цели проведены лабораторные эксперименты по внутриформенному модифицированию отливок из стали Гадфильда мелкодисперсным порошком карбонитрида титана, изучены микроструктура и эксплуатационные свойства полученных сплавов
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