Automatic Welding, 2022, №06



2022 №06 (01)

DOI of Article 10.37434/as2022.06.02

2022 №06 (03)

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Avtomaticheskaya Svarka (Automatic Welding), #6, 2022, pp. 11-16

Heat-resistant pearlitic steels using an improved analysis method

V.V. Dmytryk¹, O.S. Garashchenko¹, O.M. Berdnikova²

¹National Technical University «Kharkiv Polytechnic Institute», 2 Kyrpychova Str., 61002, Kharkiv
²E.O. Paton Electric Welding Institute of the NAS of Ukraine. 11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine. E-mail: garashchenko.helena@gmail.com

The paper presents the results of determination of the quantity and dimensions of grains of the structural components of steam pipeline welded joint metal. The above determination was performed using an improved method of analysis of the structuralphase state of welded joints. It was found that during long-term operation of welded joints the grains of α-phase increase in size. Structural analysis was performed for base metal of welded joints, HAZ regions, as well as weld metal. It was established that at long-term operation of steam pipeline welded joints grain dimensions are increased in their HAZ regions. It was found that the boundaries between individual grains are partially eliminated. Based on analysis of statistical data, grain dimensions, as well as their shape and distribution were determined at application of the secant method. 9 Ref., 1 Tabl., 7 Fig.
Keywords: steam pipeline welded joints, metallographic analysis, grain size, grain quantity, pixels


Received: 19.05.2022

References

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