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Fallah, M. M.
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Publications (4/4 displayed)
- 2020Investigating the Effect of High Power Diode Laser (HPDL) Surface Treatment on the Corrosion Behavior of 17-4 PH Martensitic Stainless Steel
- 2019Nd:YAG laser welding of Ti 6-Al-4V: Mechanical and metallurgical properties
- 2018Multi-response Optimization of CO2 Laser Welding of Rene 80 Using Response Surface Methodology (RSM) and the Desirability Approach
- 2018Experimental Study of Surface Hardening of AISI 420 Martensitic Stainless Steel Using High Power Diode Lasercitations
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article
Investigating the Effect of High Power Diode Laser (HPDL) Surface Treatment on the Corrosion Behavior of 17-4 PH Martensitic Stainless Steel
Abstract
Laser surface treatment conducted using a high power diode laser <br/>(HPDL) to improve the corrosion resistance of AISI 17-4 PH stainlesssteel is conducted and investigated. Based on microstructure and corrosion behavior study, standoff distance (SOD) of 60 to 80 mm, laserpower of 1000 to 1400 W and scanning speed of 5 to 8 mm/s were considered as process parameters. The martensite formed in this alloy is of a lath morphology and has a dislocated substructure. Microscopic studies have revealed the formation of a Cu-rich phase in the samples aged at temperatures below 550°C. The martensite phase was seen to terminate at packet boundaries where two groups of laths belonging to two distinct orientation variants met. After HPDL treatment the microhardness and corrosion resistance of the 17-4 PH stainless steel were examined. Whereas the microhardness was altered accordingly with variation of the chosen laser operating parameters, the corrosion resistance showed no great improvement.