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Effect of heat treatment on the wear resistance of cast irons

Published/Copyright: March 29, 2016
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Abstract

In this study, the wear behavior of chilled cast iron and nodular cast iron materials used in camshaft manufacturing has been compared. Nodular cast iron specimens were additionally heat treated at 200 and 300 °C for stress relieving after hardening. Thus, the effect of the stress release treatment on wear behavior was comparatively evaluated with respect to the untreated specimens. The ball-on-disk test described in ASTM G99-05 standard was performed under dry sliding conditions as wear test. The specimens were exposed to dry sliding test under a load of 30 N with a rotational speed of 300 rpm against hardened 100Cr6 counterparts and for the distances of 100, 500 and 1000 m. The results showed two different wear behaviors for the 100 m and 500/1000 m distances, respectively. Under given dry sliding conditions, induction hardened nodular cast iron and slightly stress released specimens exhibited relatively higher wear resistance in the tests over a distance of 500 and 1000 m, while the others showing an increase in wear loss amounts at the same sliding distances.

Kurzfassung

In der diesem Beitrag zugrunde liegenden Studie wurde das Verschleißverhalten von abgeschreckten Gusseisen und Gusseisen mit Kugelgraphit, die in der Nockenwellenfertigung eingesetzt werden, miteinander verglichen. Die Proben aus Gusseisen mit Kugelgraphit wurden zusätzlich bei 200 und 300 °C wärmebehandelt, um einen spannungsarmen Zustand nach dem Härten zu erzielen. Deshalb wurde die Wirkung der Spannungsarmglühung auf das Verschleißverhalten mit den unbehandelten Proben verglichen. Als Verschleißversuch wurde ein Kugel-Scheibe-Versuch entsprechend des ASTM-Standards G99-05 unter Trockenreibbedingungen durchgeführt. Die Proben wurden dem Trockenverschleißversuch unter einer Belastung von 30 N und bei einer Rotationsgeschwindigkeit von 300 U × min−1 sowie gegen gehärtete Gegenstücke aus dem Stahl 100Cr6 über eine Distanz von 100, 500 und 1000 m bei entsprechender Drehung ausgesetzt. Die Ergebnisse zeigen, dass sich zwei verschiedene Verschleißverhalten für die Entfernung von 100 m gegenüber der von 500 und 1000 m ergeben. Unter den gegebenen Trockenreibbedingungen zeigen die induktionsgehärteten Gusseisenproben mit Kuglegraphit und die leicht spannungsarmgeglühten Proben einen entsprechend höheren Verschleißwiderstand in den Versuchen über eine Distanz von 500 und 1000 m, während die übrigen Proben einen Anstieg der Verschleißverlustwerte bei den gleichen Reibdistanzen aufweisen.


*Correspondence Address, Assist. Prof. Dr. Enbiya Türedi, Kocaeli University, Faculty of Engineering, Department of Metallurgical and Materials Engineering, TR-41380 Kocaeli, Turkey. E-mail:

Dr. Enbiya Türedi, born in 1979, graduated from Kocaeli University, Department of Metallurgical and Materials Engineering, Kocaeli, Turkey. He received his MSc and PhD degrees from the Department of Metallurgical and Materials Engineering, Kocaeli University, and from the Institute for Manufacturing Technologies of Ceramic Components and Composites, University of Stuttgart, Germany, respectively. He is working as Assistant Professor at Kocaeli University, Department of Metallurgical and Materials Engineering in Kocaeli, Turkey.


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Published Online: 2016-03-29
Published in Print: 2016-04-04

© 2016, Carl Hanser Verlag, München

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