Conclusions
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1.
The zone formed in the surface layer of steel 35 with laser treatment at speeds of 10–40 mm/sec consists of four layers. The surface (first) and transition (second) layers are completely quenched and consist of martensite differing in dispersity. Incomplete quenching occurs in the third and fourth layers.
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2.
The hardness is highest in the first and especially the fourth layer, while the hardness of ferrite in the zones of incomplete quenching is somewhat higher than the hardness of ferrite in the original structure.
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3.
The differences observed in the structure and hardness of the layers are explained by differences in the heating and cooling conditions.
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Literature cited
M. A. Krishtal et al., Structure and Properties of Alloys Treated with a Laser Beam [in Russian], Metallurgiya, Moscow (1973).
N. N. Rykalin, et al. Laser Treatment of Materials [in Russian], Mashinostroenie, Moscow (1975).
S. I. Anisimov et al., Effect of High-Power Radiation on Metals [in Russian], Nauka, Moscow (1970).
Additional information
Moscow Automobile Factory. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 1, pp. 53–55, January, 1978.
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Goryushin, V.V., Mart'yakova, A.V. Effect of laser treatment on the structure and properties of steel 35. Met Sci Heat Treat 20, 53–57 (1978). https://doi.org/10.1007/BF00670444
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DOI: https://doi.org/10.1007/BF00670444