Title: Investigations on machinability and machining stability of turning super duplex stainless steel

Authors: N. Subhash; T. Jagadeesha; Mohit Law

Addresses: Machine Tool Dynamics Laboratory, Department of Mechanical Engineering, Indian Institute of Technology Kanpur, Kanpur 208016, India ' Department of Mechanical Engineering, National Institute of Technology, Calicut, Kerala 673601, India ' Machine Tool Dynamics Laboratory, Department of Mechanical Engineering, Indian Institute of Technology Kanpur, Kanpur 208016, India

Abstract: Super duplex stainless steels (SDSSs) combine austenite and ferrite in near equal proportions along with other alloying elements giving these steels excellent mechanical and chemical properties and making them of much use across industries. The same characteristics that give SDSS advantageous properties impair their machinability and make cutting of SDSS prone to unstable process-induced chatter vibrations. The focus of this paper is to hence investigate the machinability and machining stability of dry turning SDSS. Based on systematic experimental characterisation, we identify cutting force coefficients that characterise machinability and observe these coefficients to be relatively speed independent. We further observe surface characteristics to improve with cutting speeds. Using identified coefficients and measured dynamics, we predict the stability behaviour. Experimental validation confirms that the nose radius on cutting tools plays a significant role in improving the chatter vibration-free turning of SDSS. Our findings can instruct high-performance strategies for turning of SDSS.

Keywords: super duplex stainless steel; SDSS; machinability; cutting force coefficients; dynamics; stability.

DOI: 10.1504/IJMMM.2020.109849

International Journal of Machining and Machinability of Materials, 2020 Vol.22 No.5, pp.386 - 405

Received: 29 Aug 2019
Accepted: 26 Oct 2019
Published online: 28 Sep 2020 *

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