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Microstructure and Mechanical Properties of the Wire Arc Additively Manufactured Sv-08G2S Steel

2020; IOP Publishing; Volume: 969; Issue: 1 Linguagem: Inglês

10.1088/1757-899x/969/1/012005

1757-899X

A. A. Kulikov, A E Balanovskiy, M V Grechneva,

Welding Techniques and Residual Stresses

Abstract Wire arc additive manufacturing enables using almost any grade of metal for the additive production of parts with complex shapes and large sizes. As an increasingly growing number of materials are being used for WAAM, it is necessary to conduct systematic research on the properties of various metals and alloys. This article presents a study of the microstructure and mechanical properties of the wire arc additively manufactured Sv-08G2S steel. Once the wall-shaped sample was deposited, it was cooled in the air at room temperature. The sample for microstructure studies was cut across the central line of the deposited layers. In the sample, three sectors were conditionally distinguished: the lower sector, deposited on a cold substrate, has a ferrite structure with inclusions of lamellar perlite; the middle sector has a purely ferritic structure; the upper sector has a bainite structure. The microstructure study was followed by hardness measurements performed in all sectors of the sample. The hardness values confirmed the presence of different structures in all sectors, the hardest of which was the upper sector with a bainite structure. The last stage of the study was the tensile testing of the sample performed on a test breaking machine. The obtained values of the ultimate tensile strength and yield strength of additively deposited steel are within the range and even exceed the characteristics of wrought low-carbon steels. Therefore, the conducted research proved that the additive manufacturing of parts made of Sv-08G2S steel enables achieving the necessary quality and provides the mechanical properties required for structural steels.