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Registration Number

0223U000698, 0120U100611 , R & D reports

Title

Development of scientific bases of melt complex modifying and refining technologies for structure and properties formation processes control in castings made of ductile cast iron with higher plasticity.

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Head

Bublykov Valentyn B., Доктор технічних наук

Registration Date

19-01-2023

Organization

Physico-technological institute of metals and alloys National academy of Sciences of Ukraine

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Research goal – creation of scientific basis of effective technologies of iron-carbon melts modifying and refining processing and methods of crystallization and structure formation processes control in ductile cast irons with nodular graphite to obtain the predicted high physical, mechanical and service characteristics in products. New scientific results were obtained on the production of ductile iron with increased plasticity by means of complex modifying and refining of the melt with FeSiMgCa master alloys in combination with calcium fluorite, which accelerates the master alloy melting. It has been experimentally confirmed that the formed low-melting oxide-fluoride slag of the CaO-SiO2-CaF2 system performs a refining function, acting as an adhesive filter that reduces the melt pollution with non-metallic inclusions. As a result of increasing the melt refining degree with calcium and the formed liquid slag, the efficiency of the modifying process increases by 25-30 %, which accordingly allows to reduce the master alloy consumption. It was established that at using of in-mold modifying the mass fraction of silicon in ductile iron can be reduced to 1,3 % without the formation of structurally free carbides. This allows to obtain a metal with a relative elongation A = 24-27 %, an impact toughness KC = 115-130 J/cm2 with a tensile strength Rm = 450-500 MPa and improved cutting machinability. The parameters of highly effective technologies of complex melt modifying and refining, methods of structure formation processes control for obtaining products with increased technological, mechanical and functional properties from ferritic high-strength cast irons have been developed. When use the obtained results the strength, plasticity and impact toughness of ferritic high-strength cast iron are increased by 20-30 %, the casting yield increases to 65 %, up to 400 kW/h electricity is saved when producing 1 ton of castings, the service life of cast parts increases in 1,3-1,5 times

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Bachynskyi Yurii D.
Berchuk Dmytro M.
Doroshenko Volodymyr S.
Medvid Serhiy M.
Moiseieva Nataliia P.
Nesteruk Olena P.
Ovsiannykov Volodymyr O.
Сhaplyhina Liudmyla S.
Yasynska Olena O.
Yasynskyi Oleksandr O.

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2023-01-19