Influence of thermal aging modes on mechanical properties of steel welded joint 03N18K9M5T

Abstract The article presents results of research of the influence of the modes of thermal aging, namely temperature of aging and hold time, on mechanical properties of a weld joint from maraging steel 03H18K9M5T. Aging curves were constructed, that is, the hardness of the metal under study versus the holding time at certain temperatures. Based on the results obtained, an optimal thermal aging regime was proposed for all areas of the welded joint, after which the welded joints were heat-treated by aging in optimal conditions. Hardness distributions were built over the section of the welded joint of martensitic-aging steel samples. Metallographic studies were carried out on the weld microspheres.