V. P. Kuznetsov, I. A. Vorontsov, V. A. Khotinov, I. S. Kamantsev

ENHANCING THE MECHANICAL PROPERTIES OF THE HEAT-AFFECTED ZONE OF A 09G2S STEEL WELDED JOINT DURING FRICTION STIR PROCESSING

The paper proves the effectiveness of the friction stir processing of the heat-affected zone in a 09G2S steel welded joint by a carbide tool with a spherical tip having a radius of 10 mm, a normal force of 3000 N, a rotation speed of 2500 rpm, and feeds of 50, 75, and 100 mm/min. During processing, the mixed structure of the upper bainite, Widmanstӓtten ferrite, and ferrite grains changes to a globular ferrite-pearlite structure when the grains are refined in the stir zone up to 96%. The practical application of friction stir processing by a tool with a spherical tip for the hardening of the heat-affected zone of the 09G2S steel welded joint is demonstrated. As a result of the processing, the yield strength and the ultimate strength increased by 15.5% and 23.3%, respectively, the specific elongation increased by 78.6%, and the maximum recorded average increase in microhardness was 171%.

Acknowledgment: The study was performed by the Youth Laboratory of Material Surface Modification at the Yeltsin UrFU under the agreement with the Ministry of Science and Higher Education of the Russian Federation, № 075-03-2024-009/4 dated April 11, 2024 (FEUZ-2024-0020).

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