Springer Online Journal Archives 1860-2000
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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 m s-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 HRc. Laser melting could effectively reduce Corrosion rates in dilute acids by nearly 40%. These improvements were caused by the ultrafine microstructure (1–4 μ, 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 N H2SO4, were assessed after laser surface melting or transformation hardening of hyper-eutectic ductile iron, typically employed in automotive and marine engine components by using CO2 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 2 b) for threshold and specific depth of transformation hardening or melting have been determined.
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