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Effect of heat treatment and cryogenics on hardness of ductile cast iron microstructure (FCD­50)

Sabarudin, Suriyansyah, Pratikto, Pratikto and Suprapto, Agus ORCID: (2018) Effect of heat treatment and cryogenics on hardness of ductile cast iron microstructure (FCD­50). Eastern-European Journal of Enterprise Technologies, 2 (12(92)). pp. 20-26. ISSN 1729-3774 (p) ; 1729-4061 (e)

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The results of researches of possibilities of increasing the mechanical properties of pig iron with ball-bearing graphite of brand FCD-50 by the combined heat treatment are described. The scheme of multistage heat treatment, the characteristic feature of which is the operation of cooling in liquid nitrogen, is proposed. The use of such a scheme allows for increased HRC hardness characteristics. The study of the microstructure of cast iron treated with this scheme has proved the efficiency of the cryogenic heat treatment stage and determined its rational regimes. To match or approximate the properties of steel, the mechanical properties of this ductile cast iron 50 (FCD-‎‎50) must be ‎enhanced by methods such as ACTDI (austemper cryogenic and temper Ductile Iron). In this procedure, the FCD-50 specimen is inserted into the electric kitchen heater at 350 °C ‎‎(room temperature), heated to 600 °C and held at this temperature for 45 minutes. Next, the ‎specimen is heated to 900 °C and held at this temperature for 1 hour ‎‎(temperature austenisation). Then, the specimen is placed in furnace 2 at 3,000 °C for 45 minutes ‎‎(austempering process). The specimen subsequently is cooled in ‎liquid nitrogen. In this study, additional specimens were obtained for hardness and ‎microstructure tests. The as-cast test yielded a ‎hardness value of 18.39 HRC. In the hardness test for the ACTDI process, 12 ‎hours of submersion yielded the highest hardness result of 24.25 HRC. ‎In terms of the changes in microstructure after soaking changes, the amount of perlite present in the specimen was greater than that of ferrite, and the arrangement of graphite ‎nodules was better than that of the as-cast material.‎

Item Type: Article
Additional Information: Agus Suprapto NIDN: 0707095801
Uncontrolled Keywords: FCD-50, spheroidal graphite cast iron, thermal treatment, cryogenic treatment, hardness, microstructure
Subjects: T Technology > TJ Mechanical engineering and machinery
T Technology > TN Mining engineering. Metallurgy
Divisions: Fakultas Teknik > S1 Teknik Mesin
Depositing User: Rita Juliani
Date Deposited: 03 Apr 2023 06:57
Last Modified: 03 Apr 2023 06:57

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