Laser surface hardening of AISI 420 stainless steel treated by pulsed Nd:YAG laser |
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| Authors: | B. Mahmoudi M.J. Torkamany A.R. Sabour Rouh Aghdam J. Sabbaghzade |
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| Affiliation: | 1. Department of Materials Engineering, Tarbiat Modares University, PO Box 14115-111, Tehran, Iran;2. Iranian National Centre for Laser Science and Technology, PO Box 14665-576, Tehran, Iran |
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| Abstract: | The AISI 420 martensitic stainless steel was surface-hardened by a pulsed Nd:YAG laser. The influences of process parameters (laser pulse energy, duration time and travel speed) on the depth and hardness of laser treated area and its corrosion behavior were Investigated. In the optimum process parameters, maximum hardness (490 VHN) in the laser surface treated area was achieved. The pitting corrosion behavior was studied by potentiodynamic polarization technique in 3.5% NaCl solution at 25 °C. Metallographical and electrochemical corrosion studies illustrated beneficial effects of laser surface hardening by refining the microstructure and enhancing the pitting corrosion resistance of the martensitic stainless steel. The pitting corrosion resistance of laser surface treated samples in 3.5% NaCl solution depends on the overlap ratio clearly. The pitting potential (Epp) decreased significantly by increasing the ratio of pulse overlapping. |
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| Keywords: | AR, as received CHT, conventional heat treated EDS, energy dispersive spectroscopy Epp, pitting potential LHT 25%, laser heat treated sample with 25% overlap LHT 50%, laser heat treated sample with 50% overlap LHT 75%, laser heat treated sample with 75% overlap MSS, martensitic stainless steel OM, optical microscopy OCP, open circuit potential SEM, scanning electron microscopy SCE, saturated calomel electrode SHE, saturated hydrogen electrode VHN, vickers hardness number |
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