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Meeting MS&T21: Materials Science & Technology
Symposium New Frontiers in Physical Metallurgy of Steels
Presentation Title Microstructure and Toughness Correlation in High Strength Q&T Boron Steels Microalloyed with Nb and Mo
Author(s) Irati Zurutuza, Nerea Isasti, Eric Detemple, Volker Schwinn, Hardy Mohrbacher, Pello Uranga
On-Site Speaker (Planned) Pello Uranga
Abstract Scope Suitable combination between alloy concept and processing is required for meeting the challenging market requirements for high strength steels produced by Direct Quenching (DQ) and tempering treatments. Even though the synergetic effect on tensile property improvement by combining boron and microalloying elements (Nb, Mo and Nb+Mo) is well-known, the impact of different microstructural aspects on Charpy impact toughness remains unclear. In the current presentation, the contribution of different microstructural aspects on toughness is evaluated, after DQ and tempering laboratory tests. Martensite unit size and dislocation density quantification was performed using EBSD. The detrimental effect of microstructural heterogeneity and carbides is also quantified. Additionally, an approach for impact transition temperature prediction is proposed for tempered martensite. Unit size refinement is shown to be the most effective mechanism for controlling simultaneously strength and toughness. The results suggest that Mo-B alloying concept shows the best yield strength-toughness balance.

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

Austenite Decomposition during Hot-strip Rolling of Microalloyed Low-carbon Steel
Austenite Decomposition in the Coarse Grain Heat Affected Zone of X80 Line Pipe Steel
Improving the Fatigue Performance of Nitrided Steels with Amorphous and Crystalline Precipitates
Microstructural Engineering and Accelerated Test Method Development to Achieve Low Cost, High Performance Solutions for Hydrogen Storage and Delivery
Microstructural Modeling and Design in Triple Nano-precipitate Strengthened Austenitic Steel
Microstructure and Toughness Correlation in High Strength Q&T Boron Steels Microalloyed with Nb and Mo
Nano-precipitation and Resultant Surface Hardening by Nitriding of Ferrous Alloys
Nanoscale Investigation of Austenite/ferrite Interfaces in Medium Carbon Fe-Mn-C Steels at Different Inter-critical Temperatures
New Approach to Producing High Alloy Steels
Obtaining High Strength Ductility Combination by Quenching and Partitioning of Rolled Low Carbon Steel Sheet
Relationship between Fatigue Strength and Microstructure of Carburized Steel Tempered at Different Temperature
Simulation of the Nitriding and Ferritic Nitrocarburizing (FNC) Processes
Tribological Characterization of Silicon Stainless Steel Alloys

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