INVESTIGATION AND COMPUTER ANALYSIS OF THE MECHANICAL PROPERTIES OF THE 08GDNFL STEEL BY MODELING THE STRUCTURAL PARAMETERS

Due to the extensive use of the 08GDNFL cast steel in shipbuilding for fabricating massive sections with thicknesses up to 500 mm, it is necessary to carry out a comprehensive study on the solidification and formation of the mechanical properties of essential basic components with combination walls. The parameters for the local crystallization time and the sizes of the forming dendritic structure were obtained on extended 100-500 mm-thick sections for a large-scale cast 08GDNFL steel probe weighing 9.3 tons solidifying in a sand form with the help of industrial thermal analysis and computer simulation of thermal processes. Based on the experimental data on a set of mechanical characteristics of the cast metal in different parts of the sample with a thickness of 100 to 500 mm, a uniform distribution of properties meeting the GOST requirements was shown. Similar results were obtained, using the AusEvol Pro software, by simulating the evolution of the structure due to solid-phase transformations and predicting the mechanical properties during casting cooling and by heat treatment under normalization.