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Effect of processing conditions on the corrosion performance of laser surface-melted AISI 440C martensic stainless steel
C.T. Kwok1,2; K.H. Lo2; F.T. Cheng2; H.C. Man3
2003-03-24
Source PublicationSurface and Coatings Technology
ISSN0257-8972
Volume166Issue:2-3Pages:221-230
Abstract

Laser surface melting of AISI 440C martensitic stainless steel was achieved using a 2.5-kW continuous wave Nd:YAG laser. The pitting corrosion behavior of laser surface-melted specimens processed under different processing conditions in 3.5% NaCl solution at 23 °C was studied by potentiodynamic polarization technique. The corrosion resistance of all laser surface-melted specimens was significantly improved, as evidenced by a shift from active corrosion to passivity, a wide passive range and a low passive current density. The pitting potential of the laser surface-melted specimens P08-440C-25 (laser powers = 0.8 kW, scanning speed = 25 mm/s) and P12-440C-25 (laser power = 1.2 kW, scanning speed = 25 mm/s) was increased to 260 and 200 mV (SCE), respectively, and was much higher than that of the conventionally heat-treated AISI 440C. The pitting corrosion characteristics of the laser surface-melted specimens were strongly dependent on the processing conditions which resulted in different microstructures. The enhanced corrosion resistance was attributed to the dissolution or refinement of carbide particles and the presence of retained austenite. The amount of carbides in the melt layer, which indirectly determine the Cr content in solid solution and hence, the corrosion resistance, was related to the amount of C remaining in solid solution and to decarburization. The pit morphology of the laser surface-melted specimen was also studied. 

KeywordLaser Surface Melting Martensic Stainless Steel Nd Pitting Corrosion Yag Laser
DOI10.1016/S0257-8972(02)00782-X
URLView the original
Indexed BySCIE
Language英語English
WOS Research AreaMaterials Science ; Physics
WOS SubjectMaterials Science, Coatings & Films ; Physics, Applied
WOS IDWOS:000180761800017
PublisherELSEVIER SCIENCE SA, PO BOX 564, 1001 LAUSANNE, SWITZERLAND
The Source to ArticleScopus
Scopus ID2-s2.0-0037464377
Fulltext Access
Citation statistics
Document TypeJournal article
CollectionDEPARTMENT OF ELECTROMECHANICAL ENGINEERING
Corresponding AuthorF.T. Cheng
Affiliation1.Department of Electromechanical Engineering, Faculty of Science and Technology, University of Macau, Taipa, Macau, PR China
2.Department of Applied Physics, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, PR China
3.Department of Industrial and Systems Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, PR China c
First Author AffilicationFaculty of Science and Technology
Recommended Citation
GB/T 7714
C.T. Kwok,K.H. Lo,F.T. Cheng,et al. Effect of processing conditions on the corrosion performance of laser surface-melted AISI 440C martensic stainless steel[J]. Surface and Coatings Technology, 2003, 166(2-3), 221-230.
APA C.T. Kwok., K.H. Lo., F.T. Cheng., & H.C. Man (2003). Effect of processing conditions on the corrosion performance of laser surface-melted AISI 440C martensic stainless steel. Surface and Coatings Technology, 166(2-3), 221-230.
MLA C.T. Kwok,et al."Effect of processing conditions on the corrosion performance of laser surface-melted AISI 440C martensic stainless steel".Surface and Coatings Technology 166.2-3(2003):221-230.
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