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Laser Hardfacing of 1050 Mild Steel Using NiCoCrB for Enhancing Cavitation Erosion-corrosion Resistance
C. T. Kwok1; F. T. Cheng2; H. C. Man3
2001
Conference Name20th International Congress on Applications of Lasers and Electro-Optics (ICALEO 2001)
Source Publication20TH ICALEO 2001, VOLS 92 & 93, CONGRESS PROCEEDINGS
Conference Date15-18 October 2001
Conference PlaceJacksonville, Florida, USA
PublisherLASER INST AMERICA, 12424 RESEARCH PKWY, STE 130, ORLANDO, FL 32826 USA
Abstract

Laser surface modification of mild steel AISI 1050 was achieved using a hardfacing powder NiCoCrB. NiCoCrB was flame-sprayed on the substrate and then consolidated by a 2-kW NdYAG laser. The microstructures of the laser-modified specimens were studied by SEM, optical microscopy and XRD. The modified layers contained austenite as the main phase, with carbides and borides as the minor phases. The maximum hardness of the specimens was increased to 545 Hv. The cavitation erosion resistance in deionized water and 3.5% NaCl was improved by a factor of 4.4 and 8.3, respectively. The increase in erosion resistance was attributed to the presence of Co, which decreased the stacking-fault energy and enhanced the strain-induced martensitic transformability, and to the presence of carbides and borides, which resulted in an increase in hardness. On the other hand, the presence of Cr and Ni, together with a refined microstructure, led to an improvement in the corrosion resistance.

DOIhttps://doi.org/10.2351/1.5059940
Indexed BySCI
Language英语
WOS Research AreaMaterials Science ; Optics ; Physics
WOS SubjectMaterials Science, Multidisciplinary ; Optics ; Physics, Applied
WOS IDWOS:000177444200090
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Document TypeConference paper
CollectionDEPARTMENT OF ELECTROMECHANICAL ENGINEERING
Affiliation1.Faculty of Science and Technology, University of Macau, P.O. Box 3001, Taipa, Macau, China
2.Department of Applied Physics, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China
3.Department of Manufacturing Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China
First Author AffilicationFaculty of Science and Technology
Recommended Citation
GB/T 7714
C. T. Kwok,F. T. Cheng,H. C. Man. Laser Hardfacing of 1050 Mild Steel Using NiCoCrB for Enhancing Cavitation Erosion-corrosion Resistance[C]:LASER INST AMERICA, 12424 RESEARCH PKWY, STE 130, ORLANDO, FL 32826 USA,2001.
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