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| THE EFFECT OF LASER TRANSFORMATION IRRADIATION ON THE CORROSION BEHAVIOUR OF 50CrV STEEL |
| Wang Maoeai Wu Weitao; Niu Yan (Institute of Corrosion and Protection of Metals; Academia Sinica) Zuo Yangxiu and Shen Dehe (Dalian Locomotive and Rolling Stock Works; Ministry of Railways) |
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Abstract Plate of spring steel 50CrV for making driving leafspring of locomotive was surface hardened by CO_2 laser beam. The hardened zonee was characterized by a microstructure with very fine martensite and trace of residual austenite. Measurements of the surface residual stress were performed. The results showed that the surface stress state was compressive in the hardened zone, while it was tensile in the heat effected zone, and that the change of hardness was in good agreement with the change of the stress from compressive to tensile. Obviously, the compressive state of the stress in the hardened zone may be due to the volume expansion associated with the martensitic transformation. Corrosion potential distribution and dynamic potential polarizatign behaviour of the laser hadened zone in dilute solutions of Na_2SO_4, NaOH and H_2SO_4 etc. was studied. It followed that the hardened zone exhibited higher corrosion resistance than both it's vicinity of heat effected zone and the untreated substrate. The passivation range of the laser hardened zone widened significantly and the corrosion current of passivation range decreased greatly, in some, cases, by nearly one order of magnitude as compared with that of untreated substrate. The corrosion behavior was discussed in relation to it's characteristic microstructure and stress state of the laser hardened zone.
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Received: 25 June 1989
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Cite this article:
Wang Maoeai Wu Weitao; Niu Yan (Institute of Corrosion and Protection of Metals; Academia Sinica) Zuo Yangxiu and Shen Dehe (Dalian Locomotive and Rolling Stock Works; Ministry of Railways). THE EFFECT OF LASER TRANSFORMATION IRRADIATION ON THE CORROSION BEHAVIOUR OF 50CrV STEEL. J Chin Soc Corr Pro, 1989, 9(3): 225-230.
URL:
https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1989/V9/I3/225
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