# Surface properties of laser processed ductile iron

Gadag, SP and Srinivasan, MN (1996) Surface properties of laser processed ductile iron. In: Applied Physics A:Materials Science and Processing, 63 (4). pp. 409-414.

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## Abstract

On laser melt treatment, Sliding Wear of pearlitic ductile iron reduced from severe metallic wear to oxidative mild wear by nearly two orders of magnitude at $7.5 ms^{-1}$ over a load range of $14-31 kg cm^{-2}$; resistance to Cavitation Erosion improved by a factor of seven in corrosive media and surface hardness increased from 20-22 to 40-58 $HR_c$. Laser melting could effectively reduce Corrosion rates in dilute acids by nearly 40%. These improvements were caused by the ultrafine microstructure $(1-4 \mu, DAS)$, microhardness $(700-900, HV_{0,1})$ and the consequent high resistance to plastic flow and subsurface crack initiation. In this investigation, pin-on-disc adhesive wear, ultrasonic vibratory cavitation erosion and potentiodynamic corrosion in synthetic sea water and 0.01 $NH_2SO_4$, were assessed after laser surface melting or transformation hardening of hyper-eutectic ductile iron, typically employed in automotive and marine engine components by using $CO_2$ CW or Nd-YAG pulsed high power laser. Also the processing parameters viz, beam power (P), scan rate (U), and specific energy intensity $(P/UD_b^2)$ for threshold and specific depth of transformation hardening or melting have been determined.

Item Type: Journal Article Copyright of this article belongs to Springer. Division of Mechanical Sciences > Mechanical Engineering 07 Mar 2007 19 Sep 2010 04:34 http://eprints.iisc.ernet.in/id/eprint/9612