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      The Effects of Austempering Temperature and Time on the Machinability of Vermicular Graphite Iron Translated title: Effekte der Austemperungstemperatur und -zeit auf die Bearbeitbarkeit von Gusseisen mit Vermiculargraphit

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      1 , * , , 1
      Materials Testing
      Carl Hanser Verlag
      Materials testing, machinability, surface roughness, cast iron

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          Abstract

          In this study, the effect of austempering heat treatment on the cutting forces and surface roughness was investigated during the processing of vermicular graphite cast irons (VGCI) which are widely used in the automotive industry due to their high strength properties. The samples were austenitized at 900 °C for 90 minutes and then austempered at different temperatures (320 °C and 370 °C) for 60 min, 90 min, and 120 min. Machinability tests were carried out under dry conditions at the CNC machining center with the cutting parameters selected in accordance with ISO 3685. As a result of processing of austempered vermicular graphite cast irons with different characteristics the formed cutting forces, surface roughness, cylindricity, and circularity were measured and compared. At the end of the tests, it turned out that the ausferrite morphology (fine or coarse structure) can to be controlled with the austempering heat treatment as well as cutting forces and surface roughness were optimized, respectively. The best surface roughness value was obtained for the austempering parameters of 370 °C and 120 minutes.

          Kurzfassung

          In der diesem Beitrag zugrunde liegenden Studie wurde die Wirkung des Austemperns auf die Schnittkräfte und Oberflächenrauheit während des Verarbeitungsprozesses von Gusseisen mit Vermiculargraphit (VGCI), das aufgrund seiner Festigkeit breitflächig in der Automobilindustrie verwendet wird, untersucht. Die Proben wurden bei 900 °C für 90 min austenitisiert und dann bei verschiedenen Temperaturen (320 °C und 370 °C) für 60 min, 90 min und 120 min ausgetempert. Die Verarbeitbarkeitsversuche wurden unter trockenen Einsatzbedingungen in einer CNC-Bearbeitungsstation übereinstimmend mit ISO 3685 durchgeführt. Als ein Ergebnis der Bearbeitung von ausgetemperten Gusseisen mit Vermiculargraphit mit unterschiedlichen Eigenschaften wurden die verschiedenen Schnittkräfte, die Oberflächenrauheit, die Rundheit, sowie die Zylindrizität gemessen und verglichen. Am Ende der Versuche stellte sich heraus, dass die Ausferritmorphologie (feine oder grobe Struktur) mittels Austemperns kontrolliert werden kann und die Schnittkräfte sowie Oberflächenrauheit entsprechend optimiert werden können. Der beste Wert der Oberflächenrauheit ergab sich für die Parameter 370 °C und 120 min.

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          Most cited references15

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          Surface integrity in finish hard turning of case-hardened steels

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            Development of austempered ductile cast iron (ADI) with simultaneous high yield strength and fracture toughness by a novel two-step austempering process

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              Turning of hardened 100Cr6 bearing steel with ceramic and PCBN cutting tools

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                Author and article information

                Journal
                mp
                Materials Testing
                Carl Hanser Verlag
                0025-5300
                2195-8572
                1 April 2014
                : 56
                : 4
                : 289-293
                Affiliations
                1 Ankara, Turkey
                Author notes
                [* ] Correspondence Address, Ahmet Mavi, Gazi University, OSTIM Vocational School, Mechatronics Program and Faculty of Technology, Manufacturing Engineering, Ankara, Turkey, E-mail: amavi@ 123456gazi.edu.tr

                Ahmet Mavi was born in 1981 in Mersin, Turkey. He received his PhD from Gazi University Institute of Science and Technology, Ankara, Turkey in 2014. He still works as lecturer at Gazi University, Turkey. His research interests concentrate on machinability of materials.

                İhsan Korkut was born in 1964 in Osmaniye, Turkey. He received his PhD from Gazi University Institute of Science and Technology, Ankara, Turkey in 1996. He still works as professor at Gazi University, Turkey. His research interests concentrate on machinability of materials. His work area also includes computer aided design, computer aided manufacturing and mechanics.

                Article
                MP110559
                10.3139/120.110559
                3cd5a1c2-18b0-48a0-a31c-d1f322c58e0b
                © 2014, Carl Hanser Verlag, München
                History
                Page count
                References: 19, Pages: 5
                Categories
                Fachbeiträge/Technical Contributions

                Materials technology,Materials characterization,Materials science
                cast iron,machinability,surface roughness,Materials testing

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