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Изучение влияния внепечной обработки на величину зерна аустенита цементуемых марок стали

Изучение влияния внепечной обработки на величину зерна аустенита цементуемых марок стали

Abstract

Для ряда цементуемых низкоуглеродистых сталей (16MnCrS5, 20MnV6, 18ХГТ, 25ХГТ, Е470) в зависимости от требований потребителя, необходимо получение стабильного мелкого аустенитного зерна при высокотемпературном нагреве и длительной выдержке. Для обеспечения стабильности величины аустенитного зерна необходимо минимально достаточное количество ниобия в пределах согласно спецификации потребителя. В работе представлены исследования по освоению технологии производства цементуемых сталей со стабильной величиной аустенитного зерна с апробацией внесения изменений в технологию внепечной обработки. После корректировки технологии внепечной обработки стали максимальный размер аустенитного зерна в исследуемых образцах соответствовал 3-5 баллу. Результаты металлографических исследований показывают, что корректировка технологии внепечной обработки стали марки 16MnCrS5 не позволила в полной мере добиться поставленной цели, то есть получить величину зерна аустенита в цементуемой стали не крупнее 5 балла. Принимая во внимание полученные результаты металлографических исследований после корректировки технологии внепечной обработки и микролегирования стали ниобием, выработана дальнейшая стратегия по совершенствованию технологии производства цементуемых марок стали, устойчивых к росту аустенитного зерна при высокотемпературном нагреве и длительной выдержке в условиях ОАО «БМЗ - управляющая компания холдинга «БМК». For a number of carburized low-carbon steels (16MnCrS5, 20MnV6, 18CrMnTi, 25CrM-nTi, E470), depending on the requirements of the consumer, it is necessary to obtain stable fine austenite grains during high-temperature heating and long-term holding. To ensure the stability of the austenite grain size, a minimum sufficient amount of niobium is required within the limits according to the customer’s specification. The paper presents studies on the development of the technology for the production of case-hardened steels with a stable austenite grain size with approbation of changes in the out-of-furnace processing technology. After adjusting the technology of out-of-furnace processing of steel, the maximum size of austenite grains in the studied samples corresponded to 3–5 points. The results of metallographic stud- ies show that the adjustment of the technology of out-of-furnace processing of steel grade 16MnCrS5 did not allow to fully achieve the goal, that is, to obtain an austenite grain size in case-hardened steel no larger than 5 points. Taking into account the results of metallographic studies after adjusting the technology of out-of-furnace processing and microalloying of steel with niobium, a further strategy has been developed to improve the technology for the production of carburized steel grades that are resistant to the growth of austenite grains during high-temperature heating and long-term holding in the conditions of JSC «BMZ – the managing company of the holding» BMK».

Keywords

Длительная выдержка, Embryos, Величина аустенитного зерна, Modification, Микроструктура, Модифицирование, Out-of-furnace processing, Высокотемпературный нагрев, Внепечная обработка, Зародыши, High temperature heating, Аustenite grain size, Microstructure, Long exposure

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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
Green