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Meeting Materials Science & Technology 2014
Symposium Advanced Steel Metallurgy: Products and Processing
Presentation Title Atom Probe Compositional Analysis of Nanoscale Carbide and Carbo-nitride Precipitates in Nb-Ti Micro-alloyed Steels
Author(s) Monica Kapoor, Ron O'Malley, Gregory B Thompson
On-Site Speaker (Planned) Monica Kapoor
Abstract Scope Composition of complex carbide and carbo-nitride precipitates in Ti-Nb micro-alloyed 80-ksi (0.06 wt. % Nb; 0.06 wt. % Ti) and 100-ksi (0.03 wt. % Nb; 0.12 wt. % Ti) steels was studied using atom probe tomography. Fine (~2 nm) and coarse (~8 nm) NbTiC precipitates were identified in the 100 ksi steel with the Fe content decreasing with increasing precipitate size. Both steels had coarse NbTiCN precipitates (~ 80 nm) having ~7 at. % and ~30 at. % Nb in the precipitates for the 100 ksi and 80 ksi steels respectively. Star-shaped TiC precipitates and parallel rows of interphase NbTiC clusters on and near grain boundaries were also identified in the 100 ksi steel. In the 80 ksi steels, uniformly distributed disk-shaped and spherical NbTiC clusters were observed along dislocations. The composition and phase stability of these precipitates are discussed in terms of Thermo-Calc solution thermodynamic modeling.
Proceedings Inclusion? Definite: A CD-only volume

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

Influence of Stored Energy in Cold Rolled Sheet on the Formation of Austenite during the Subsequent Intercritical Annealing of V-bearing Dual-phase Steels
A Comparison of Different Measurement Methods to Evaluate Strain-induced Martensite Formation in a Metastable Austenitic Stainless Steel
A Composition Formula for Maraging Stainless Steels
A New Dispersion Strengthening Mechanism in Ferritic Alloys
A Study on the Strain Ageing Behavior of Steel Plates for Offshore Structure
A Uniaxial Tension/Compression Test to Measure the Bauschinger Effect in High-strength Steel Sheet
Advances in Automated SEM/EDS Technology for the Characterization of Non-metallic Inclusions in Steel
An Insight into Steelmaking Slag Structure from Phosphorus Distribution
Atom Probe Compositional Analysis of Nanoscale Carbide and Carbo-nitride Precipitates in Nb-Ti Micro-alloyed Steels
Austenite Evolution during Limited Roughing of HTP Steel
Austenite Formation and Decomposition in Medium Mn Steels
Back-stress Contribution to the Work Hardening of Dual-phase Steels
Bonding Studies between Fracture Toughened Adhesives and Advanced High Strength Steels
CFD Analysis of Hotmetal Desulfurization Process for Improved Mixing in a Torpedo Vessel
Characterization of Hot Deformation Behavior of Low Carbon Steel Using Processing Maps, Constitutive Equations and Zener-hollomon Parameter
Characterization of L80 Steel Microstructure Using Ultrasonic Measurements
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Comparision of Hot Test with Dross and Glossy Cast Iron Cooling Stave
Concrete Reinforcement Bar Manufacturing Technologies and their Effect on Rebar Performance in Structural Durability
Creation of Light, Ductile, Ultrastrong Steels through Modification of B2-IMC (Intermetallic Compound) Morphology in Austenite Matrix
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Improvement of EW Toughness in High Strength Line Pipes through GleebleŽ Simulations
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In-situ Observation of Acicular Ferrite Formation Using HT-LSCM: Possibilities, Challenges and Influencing Factors
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Microstructural and Computer Modeling Study of the Annealing Behavior of Vanadium Bearing HSLA Steel after Cold Rolling
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New AHSS in Three Distinct Classes
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