Hastelloy C-276 is a nickel-based super alloy which has inbuilt corrosion resistance and exhibits low wear resistance. In this work, an attempt has been made to improve the tribological properties of this alloy without sacrificing the corrosion properties by laser surface melting in argon atmosphere. The results indicated better grain refinement at optimum laser parameters of 1.5 kW and 300 mm/min thereby exhibiting a maximum hardness of 447 HV.The corrosion rate for the entire laser treated samples showed a decreasing trend with a minimum value of 2.07172 x10-2 mm/year, compared to base alloy. This paper demonstrates that laser surface melting is a viable method to improve the wear and corrosion properties of Hastelloy C-276.
Hastelloy C-276 was laser surface melted in a nitrogen environment in order to improve the wear resistance. The metallurgical characterisation was performed using optical microscopy, scanning electron microscopy with electron dispersive spectroscopy (EDS) and X-ray diffraction analysis. At a particular laser power and scan speed combination, significant grain refinement was achieved with finely dispersed cell-like structure which improved the hardness up to 390 HV0?3. The EDS point analysis indicated nitrogen diffusion at the cost of nickel depletion. The absence of Cr 2 N or CrN is a positive aspect in preserving the intrinsic corrosion characteristics of the alloy. The wear rates of the laser treated specimens were significantly lower by a factor of 2?5. Potentiodynamic polarisation corrosion test on the laser treated specimens also exhibited reduced corrosion rates compared to the base material.
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