Abstract
In the present study, attempts have been made to develop SiC dispersed (5 and 20 wt pct) AISI 316L stainless steel matrix composite by direct laser cladding with a high power diode laser. Direct laser cladding has been carried out by melting the powder blends of AISI 316L stainless steel and SiC (5 and 20 wt pct) and, subsequently, depositing it on mild steel (0.15 pct C steel) in a layer by layer fashion to develop a coupon of 100 mm2 × 10 mm dimension. A continuous, defect-free (microcracks and micro- or macroporosities), and homogeneous microstructure is formed, which consists of a dispersion of partially dissolved SiC (leading to formation of very low fraction of Cr3C2 and Fe2Si) in grain-refined austenite. The microhardness of the clad layer increases from 155 VHN to 250 to 340 VHN (for 5 wt pct SiC dispersed) and 450 to 825 VHN (for 20 wt pct SiC dispersed) as compared to 155 VHN of commercially available AISI 316L stainless steel. The corrosion rate in 3.56 wt pct NaCl solution is significantly reduced in 5 wt pct SiC dispersed steel; however, 20 wt pct SiC dispersed steel showed a similar behavior as the commercially available AISI 316L stainless steel. The processing zone for the development of a defect-free microstructure with improved properties has been established.
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PHILIPS is a trademark of FEI Company, Hillsboro, OR.
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Acknowledgments
Financial support from the Department of Science and Technology (Boyscast Scheme, N. Delhi), Council of Scientific and Industrial Research (N. Delhi), and Board of Research on Nuclear Science (Bombay) for the present study is gratefully acknowledged.
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Manuscript submitted February 28, 2008.
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Majumdar, J.D., Li, L. Studies on Direct Laser Cladding of SiC Dispersed AISI 316L Stainless Steel. Metall Mater Trans A 40, 3001–3008 (2009). https://doi.org/10.1007/s11661-009-0018-8
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DOI: https://doi.org/10.1007/s11661-009-0018-8