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Status | 已發表Published |
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 Publication | Surface and Coatings Technology |
ISSN | 0257-8972 |
Volume | 166Issue: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. |
Keyword | Laser Surface Melting Martensic Stainless Steel Nd Pitting Corrosion Yag Laser |
DOI | 10.1016/S0257-8972(02)00782-X |
URL | View the original |
Indexed By | SCIE |
Language | 英語English |
WOS Research Area | Materials Science ; Physics |
WOS Subject | Materials Science, Coatings & Films ; Physics, Applied |
WOS ID | WOS:000180761800017 |
Publisher | ELSEVIER SCIENCE SA, PO BOX 564, 1001 LAUSANNE, SWITZERLAND |
The Source to Article | Scopus |
Scopus ID | 2-s2.0-0037464377 |
Fulltext Access | |
Citation statistics | |
Document Type | Journal article |
Collection | DEPARTMENT OF ELECTROMECHANICAL ENGINEERING |
Corresponding Author | F.T. Cheng |
Affiliation | 1.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 Affilication | Faculty 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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