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Laser surface hardening of AISI 420 stainless steel treated by pulsed Nd:YAG laser
AbstractThe 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 (490VHN) 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.
Laser surface hardening of AISI 420 stainless steel treated by pulsed Nd:YAG laser
AbstractThe 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 (490VHN) 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.
Laser surface hardening of AISI 420 stainless steel treated by pulsed Nd:YAG laser
Mahmoudi, B. (author) / Torkamany, M.J. (author) / Aghdam, A.R. Sabour Rouh (author) / Sabbaghzade, J. (author)
2009-11-15
8 pages
Article (Journal)
Electronic Resource
English
AR , as received , CHT , conventional heat treated , EDS , energy dispersive spectroscopy , <italic>E<inf>pp</inf></italic> , 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 , Laser transformation hardening , Corrosion , AISI 420 stainless steel , Nd: YAG pulsed laser
Laser surface hardening of AISI 420 stainless steel treated by pulsed Nd:YAG laser
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