Possibility of Determining Steel Grain Size Using Ultrasonic Waves

The microstructure of steel is decisive for its chemical, physical and mechanical properties. Depending on the parameters characterising liquid metal as well as the parameters of the steel casting influencing the crystallisation process, the macrostructure of casts and ingots consist of three, two or only one crystallisation zone. In steel ingots, its most frequent by consist of three zones: chill, columnar and equiaxed grains. The structure of finished hot worked steel depends to a considerable extent on the primary structure of cast steel. Therefore, the knowledge of the microstructure of cast steel is very important on each stage of the steel products manufacturing.