|About this Abstract
||MS&T23: Materials Science & Technology
||Advances in Understanding of Martensite in Steels II
||Effect of Thermomechanical Strategy and Ni-Mo Alloying on High Strength Quenched and Tempered Thick Plates
||Xabier Azpeitia, Nerea Isasti, Hardy Mohrbacher, Eric Detemple, Pello Uranga
|On-Site Speaker (Planned)
The addition of Mo and Ni as alloying elements is a common practice for the production of heavy gauge high strength quenched and tempered plates, especially when high strength-good toughness combinations are required. Due to limited cooling rates in the plate center area, the risk of formation of undesirable soft phases within the martensitic matrix increases. In addition, the austenite conditioning and grain size refinement is more limited due to low reductions applied during roughing. With the main objective of exploring the metallurgical mechanisms interacting in the different process steps, laboratory thermomechanical simulations reproducing thick plate hot rolling mill conditions and subsequent conventional quenching were performed using steel grades with different Mo (0.25-0.5%) and Ni additions (0-1%). Phase transformations and hot working behavior was analyzed aiming to correlate the interaction between composition, processing parameters, and mechanical properties in the final quenched and tempered microstructures.