Gases constitute a number of threats to the good quality of steel castings.
Therefore, changes in the solubility of oxygen, nitrogen and hydrogen during
solidification and defects, caused by rapid reduction of solubility in the liquidus
temperature: microshrinkage, microporosity and non-metallic inclusions, have been
presented. The types of inclusions and their dependences on the chemical composition
of cast steel have been defined. The examples of adverse effect of inclusions on
mechanical properties of cast steel have been given. To reduce their impact on the
quality of castings, examples of modifications of inclusions and elements leading to
changes in the morphology of inclusions, have been identified.
Keywords: Hydrogen, Inclusions morphology, Mechanical properties, Nitrogen,
Solubility.
