Tailoring Nonmetallic Inclusions in 42CrMo4 as a Preparative Tool for Active and Reactive Steel Melt Filtration

This study investigates the effect of different temperatures during deoxidation 42CrMo4 on nonmetallic inclusions (NMI). Tailoring NMIs by a modified temperature is last step before combination reactive and active steel melt filtration. Extensive investigations metallographic sections together with electrolytic extraction allow analysis inclusions’ size distributions, chemical compositions, morphologies. Reducing from approximately 1630 °C to slightly lower (LT) 1600 leads shift inclusion distribution toward smaller NMIs. Ultrasonic fatigue testing (USFT) reveals largest particles within cyclically loaded volume, showing dendrite (1600 °C) instead plate-like morphology (1630 due LT level. The limit seems be almost unaffected change in NMIs’ morphologies evaluated Murakami's √area parameter model. oxidation found offer promising conditions for application