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Laser irradiation of AISI 316L stainless steel coated with Si3N4 and Ti |
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| Authors: | A Viswanathan D Sastikumar P Rajarajan Harish Kumar AK Nath |
| Institution: | aDepartment of Physics, National Institute of Technology, Tiruchirappalli 620 015, India bIndustrial CO2 Laser Section, Raja Ramanna Centre for Advanced Technology, Indore 452 013, MP, India |
| Abstract: | AISI 316L stainless steel was laser surface treated with different compositions of Si3N4 and Ti under various laser-processing parameters to improve its surface hardness through reinforcement of Ti-based silicides. The laser-treated regions exhibited improved surface hardness (250–1000 HV), variations in the surface morphology (smooth and bowl like) and presence of cracks and pores depending upon the Si3N4–Ti composition and laser-processing parameters. The study shows that when the Si3N4–Ti composition is 75–25 wt% and laser parameters are 1.5 kW laser power and 1.0 m min?1 scan speed, a laser-treated region with high hardness of about 800 HV and smooth surface morphology as well as free from pores and cracks is observed. The X-ray diffractometer (XRD) and Energy-Dispersive Spectroscopy (EDS) analyses show that the laser surface-treated region has reinforced phase of Ti5Si3 and retained austenitic structure. The reinforced phase gives rise to very high hardness (or wear resistance) and also a corrosion resistance. |
| Keywords: | Laser surface modification Si3N4–Ti coating Ti5Si3 reinforcement |
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