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Formation of a Martensite-Austenite Constituent in Х65 Low-Carbon Steel Under Thermomechanical Treatment and Welding

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The features of formation of a martensite-austenite (M-A) constituent in the X65 steel after its helical rolling and laser welding are studied using transmission electron microscopy. Four main types of the M-A constituent are identified in the structures. After thermomechanical treatment at low cooling rates, an island type M-A constituent with a complex internal multiphase structure (Types I and III) or a structure consisting entirely of the twinned martensite (Type II) is formed in the X65 steel. The type of the M-A constituent changes after laser welding. The island multiphase areas of the M-A constituent are replaced by dispersed elongated sections in the heat-affected zones (HAZ), consisting of the residual austenite (Type IV) or the twinned martensite. The satellite spots are observed in the microdiffraction patterns taken from the M-A constituent areas in the HAZ of the welded joint. Their formation is attributed to local supersaturation of carbon in the M-A constituent and its inhomogeneous distribution due to the limited diffusion during fast cooling after laser welding.

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Authors and Affiliations

  1. Institute of Strength Physics and Materials Science of the Siberian Branch of the Russian Academy of Sciences, Tomsk, Russia

    A. I. Gordienko, M. N. Volochaev, A. G. Malikov & A. D. Panyukhina

Authors
  1. A. I. Gordienko
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  2. M. N. Volochaev
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  3. A. G. Malikov
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  4. A. D. Panyukhina
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Corresponding author

Correspondence to A. I. Gordienko.

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Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 6, pp. 89–95, June, 2022.

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Gordienko, A.I., Volochaev, M.N., Malikov, A.G. et al. Formation of a Martensite-Austenite Constituent in Х65 Low-Carbon Steel Under Thermomechanical Treatment and Welding. Russ Phys J 65, 1004–1011 (2022). https://doi.org/10.1007/s11182-022-02725-y

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  • DOI: https://doi.org/10.1007/s11182-022-02725-y

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