Effect of Quenching Strategy and Nb-Mo Additions on Phase Transformations and Quenchability of High-Strength Boron Steels

Abstract The application of direct quenching after hot rolling plates is being employed in the production ultra-high-strength rolled plates. When heavy gauge are produced, complexity involve achieving high cooling rates plate core increased and formation undesirable soft phases within martensite common. In current paper, both conventional (DQ CQ) processing routes were reproduced by dilatometry tests continuous transformation (CCT) diagrams built for four different high-strength boron steels. results indicate that addition Mo Nb-Mo suppresses ferritic region considerably shifts CCT diagram to lower temperatures. combination DQ strategy Mo-alloying concept provides best option ensure hardenability a fully martensitic microstructure, avoid presence center thick