Effect of heat treatment on the tensile properties of cam shaft made of ductile cast iron

• Autorzy: Karaca B. , Şimşir M. , Akkan H.
• Języki publikacji: EN

Abstrakty

EN

Purpose: The aim of this study is to investigate effects of austempering heat treatment on the tensile properties of GGG60 ductile cast iron for cam shaft production. For this purpose, cam shafts have been produced by sand casting method. Design/methodology/approach: For nodulizing process, Fe-Si-Mg alloy has been used and Fe-Si-Ba-Ca-Al alloy for inoculation process. The casting has been done between 1410-1420°C and the pouring time was between 11-13 sec. The casted cam shafts and tensile test samples have been austenitized at two different temperatures (800 and 900°C) and time (60 and 90 min.) under controlled furnace atmosphere. The austenitized cam shafts and tensile test samples have been quenched into the molten salt bath at 360°C temperature and held 90 min. and then cooled in air. By this way, austempering heat treatment has been applied. Microstructure of cam shafts and tensile test samples have been examined by optical and scanning electron microscopy (SEM) and mechanical tests (hardness, and tensile tests) have been performed. Findings: Results show that austempering heat treatment increases the tensile strength of cam shaft as-cast condition. Tensile strength of the cam shaft increases with increasing austenitizing temperature and time. The highest tensile strength, 1165.5 MPa, has been obtained from the cam shaft austenitized at 900°C and 90 min. time. Research limitations/implications: The production of cam shafts used in engines, it is carried out with the casting and machining techniques. Today, cam shafts are produced from gray, nodular graphite cast iron, because of many advantages, and also machining of steel.

Słowa kluczowe

EN

camshaft; austenitizing; austempering; tensile properties; microstructure

PL

austenityzowanie; hartowanie izotermiczne; właściwości wytrzymałościowe; mikrostruktura

• Wydawca: International OCSCO World Press
• Czasopismo: Journal of Achievements in Materials and Manufacturing Engineering
• Rocznik: 2016
• Tom: Vol. 76, nr 1
• Strony: 15--20
• Opis fizyczny: Bibliogr. 7 poz., rys., tab.

Twórcy

autor

Karaca B.

• ESTAŞ Eksantrik San ve Tic A.Ş, Sivas-Turkey

autor

Şimşir M.

• Department of Metallurgy and Materials Engineering, Engineering Faculty, University of Cumhuriyet, Sivas-Turkey

autor

Akkan H.

• Department of Metallurgy and Materials Engineering, Engineering Faculty, University of Cumhuriyet, Sivas-Turkey

Bibliografia

• [1] J. Dodd, High Strength, High Ductility Ductile Irons, Modern Casting 68/5 (1987) 60-66.
• [2] R.B. Gundlach, J.F. Janowak, Austempered Ductile Iron Combined with Toughness and Ductility, Metal Progress 128 (1995) 19-26.
• [3] G.P Faubert, D.J. Moore, K.B. Rundman, Heavy Section ADI: Tensile Properties in the As-Cast and Austempered Condition, AFS Transactions 99 (1999) 551-561.
• [4] D.J. Moore, T.N. Rouns, K.B. Rundman, The relationship between microstructure and tensile properties in austempered ductile irons, AFS Transactions 95 (2005) 765-774.
• [5] K.L. Hayrynen, D.J Moore, K.B. Rundman, Tensile and fatigue properties of relatively pure ADI, AFS Transactions 93 (2002) 93-104.
• [6] V. Kilicli, M. Erdogan, The Nature of the Tensile Fracture in ADI with Dual-Matrix Microstructure, Journal of Materials Engineering and Performance 268/1 (2010) 153-165.
• [7] V. Kilicli, M. Erdogan, Tensile Properties of Partially Austenitized and Austempered Ductile Irons with Dual Matrix Structures, Materials Science and Technology 22/8 (2006) 919-928.