Microstructure and properties of high chrome steel roller after laser surface melting |
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Authors: | Meiyan Li Yong Wang Bin Han Weimin Zhao Tao Han |
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Affiliation: | College of Electromechanical Engineering, China University of Petroleum, 271 Bei’er Road, Dongying 257061, China |
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Abstract: | Laser surface melting of high chrome steels was achieved by a 5 kW continuous wave CO2 laser. The microstructure of the laser surface-melted steels was investigated by scanning electron microscopy, transmission electron microscopy and X-ray diffractometry, and the hardness profiles were determined by a Vickers hardness tester. The corrosion behavior in 3.5% NaCl solution was studied by electrochemical corrosion equipment. The large carbides of high chrome steels are completely dissolved and ultrafine dendrites of austenite with submicroscopic M23C6 carbides precipitation are formed in the melted zone. The austenite in the melted zone has a high tempering stability. The corrosion resistance of the laser surface-melted steels is significantly improved due to the dissolution of carbides and the increase of the alloying elements in the solid solution as well as the large amount of austenite. |
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Keywords: | Laser surface melting High chrome steel Microstructure Microhardness Corrosion behavior |
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