Influence of repeated tempering on the machinability and microstructure of an AISI 52100 steel

Engin Tan; Ismail Ovali; Ahmet Mavi; Mücahit Kaplan; Şenol Okay

doi:10.3139/120.110805

Published by De Gruyter November 18, 2015

Influence of repeated tempering on the machinability and microstructure of an AISI 52100 steel

Einfluss des wiederholten Temperns auf die maschinelle Bearbeitbarkeit und die Mikrostruktur eines AISI 52100 Stahls

Engin Tan , Ismail Ovali , Ahmet Mavi , Mücahit Kaplan and Şenol Okay

From the journal Materials Testing

https://doi.org/10.3139/120.110805

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Abstract

The effects of repeated tempering process on the microstructure and machinability of AISI 52100 steel in terms of cutting force, cylindricity and surface roughness were investigated in the present study. Specimens were annealed at 850 °C for 60 minutes. The specimens were then rapidly quenched in oil. Quenched samples were tempered at various tempering temperatures (175, 225, 300 and 400 °C) and numbers of passes (1 and 2) in a tempering furnace. Machining tests were carried out at various cutting speeds (30, 45, 60 and 70 m × min⁻¹), various feed rates (0.15, 0.20 and 0.25 mm × rev⁻¹) and at a constant depth of cut at 0,4 mm after repeated tempering. The experimental results show that repeated tempering temperature and number of passes significantly affect microstructure and machinability of AISI 52100 steel. The hardness of the AISI 52100 steel decreases with increasing number of temperings and temperature. The lowest cutting force was obtained at the highest cutting speed and the lowest feed rates. The machinability of AISI 52100 can be optimized by repeated tempering heat treatment.

Kurzfassung

In der diesem Beitrag zugrunde liegenden Studie wurden die Auswirkungen wiederholten Temperns auf die Mikrostruktur und die maschinelle Bearbeitbarkeit eines AISI 52100 Stahls bezüglich Schnittkraft, Rundheit und Oberflächenrauheit untersucht. Hierzu wurden Proben bei 850 °C über 60 Minuten geglüht. Die Proben wurden dann rapide in Öl abgeschreckt. Die abgeschreckten Proben wurden bei verschiedenen Temperaturen (175, 225, 300 bzw. 400 °C) in ein und zwei Durchgängen getempert. Die Versuche zur maschinellen Bearbeitung wurden bei verschiedenen Schnittgeschwindigkeiten (30, 45, 60 und 70 m × min⁻¹), Vorschubraten (0,15, 0,20 und 0,25 mm pro Umdrehung) und bei einer konstanten Schnitttiefe von 0,4 mm nach dem wiederholten Tempern durchgeführt. Die experimentellen Ergebnisse zeigen, dass die Temperatur des wiederholten Temperns und die Zahl der Durchgänge die Mikrostruktur und die maschinelle Bearbeitbarkeit des AISI 52100 Stahls signifikant beeinflussen. Die Härte nimmt mit zunehmender Anlasstemperatur und Anzahl der Durchgänge ab. Die niedrigste Schnittkraft ergab sich für die höchste Schnittgeschwindigkeit und die niedrigste Vorschubrate. Die maschinelle Bearbeitbarkeit des AISI 52100 Stahls kann somit mit wiederholtem Tempern optimiert werden.

§Correspondence Address, Assistant Prof. Dr. İsmail Ovali, Department of Manufacturing Engineering, Faculty of Technology, Pamukkale University, Denizli, Turkey. E-mail: iovali@pau.edu.tr

Dr. Engin Tan graduated from Mechanical Engineering Department of Pamukkale University, Denizli, Turkey, in 2001. He received his MSc and PhD from the same university in 2005 and 2011, respectively. He is Assistant Professor in the Department of Materials Science and Engineering, Faculty of Technology, Pamukkale University, Denizli. His main interests include heat treatment and aluminum alloys.

Dr. Ismail Ovali, born in 1981, studied Materials Science and Metallurgy at Gazi University, Ankara, Turkey. He received his PhD for his work on the topic of chilled ductile iron from the Metallurgy and Materials Science Engineering Institute of Science and Technology, University of Gazi in 2012. He is working as Assistant Professor at Pamukkale University, Denizli, Turkey. His current field of research is heat treatment of steel and machinability of steel.

Dr. Ahmet Mavi, born in 1981, received his PhD for his work on the topic of machinability of titanium alloy from the Manufacturing Engineering Institute of Science and Technology, University of Gazi in Ankara, Turkey in 2014. He worked as a lecturer at Gazi University. He is currently working as a lecturer at the Vocational School, Ankara. His main research area is machinability of materials.

Dr. Şenol Okay, born in 1976, received his PhD for his work on the topic of total quality management from the Manufacturing Engineering Institute of Science and Technology, University of Gazi in Ankara, Turkey in 2004. His main research areas are total quality management and innovations.

Mücahit Kaplan, born in 1972, received his MSc from Middle East Technical University, Ankara, Turkey in 2006. His main research areas are heat treatment of steel, bearing steel and production of knives.

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Published Online: 2015-11-18

Published in Print: 2015-11-16

Influence of repeated tempering on the machinability and microstructure of an AISI 52100 steel

Abstract

Kurzfassung

References

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