ВПЛИВ РЕЖИМІВ ЗВАРЮВАННЯ НА ЗНЕВУГЛЕЦЮВАННЯ В ЗОНІ ТЕРМІЧНОГО ВПЛИВУ СТАЛІ Р91 В ЗВАРНИХ З’ЄДНАННЯХ РІЗНОРІДНИХ СТАЛЕЙ ПІСЛЯ ВИСОКОГО ВІДПУСКУ. (Ukrainian)

Carbon migration from the lower-alloyed to the higher-alloyed steel takes place in welded joints of dissimilar steels, as a result of the difference in carbon chemical potential after tempering and in high-temperature service. Decarburization in the HAZ near-weld zone of the lower-alloyed steel can lead to formation of service defects and subsequent failure. From mass transfer theory it is known that in polycrystalline bodies the diffusion of interstitial elements, in particular carbon, occurs most rapidly along the grain boundaries. Theoretically, reduction of carbon diffusion can be achieved by increasing the grain dimensions in the HAZ near-weld zone that will lead to reduction of the overall grain boundary area per a unit of volume in this zone. This work is a study of the influence of the angle of electrode inclination and welding current at deposition of austenitic metal on R91 steel on the width of the decarburized layer, forming at subsequent tempering at the temperature of 700 and 760 C. It is shown that the resultant decarburized layer becomes narrower with increase of the angle of electrode inclination and deposition current. [ABSTRACT FROM AUTHOR]

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