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Meeting Materials Science & Technology 2020
Symposium Advanced Steel Metallurgy
Presentation Title Triple Nano-precipitate Strengthened Austenitic Steel
Author(s) Colin A. Stewart, Richard W Fonda, Keith E Knipling
On-Site Speaker (Planned) Colin A. Stewart
Abstract Scope FCC austenitic steels lack the ability to achieve significant solid solution strengthening, thus precipitate phases may instead be employed to achieve alloy strengthening upon ageing. A cost-effective Mn-stabilized austenitic steel has been engineered via an ICME approach, which demonstrates precipitation of three nano-scale phases: (i) insoluble Cu (FCC) particles; (ii) ordered intermetallic β-NiAl (B2) precipitates; and (iii) carbides. The evolution and interaction of these precipitates has been investigated across ageing times by atom probe tomography (APT) in combination with transmission electron microscopy (TEM) and electron backscatter diffraction (EBSD). These techniques help elucidate the mechanisms of particle formation, as well as the crystallographic relationships between platelet-shaped β-NiAl odered BCC precipitates and the FCC matrix. Results are discussed in the context of refining computational models for an efficient ICME alloy design approach.


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Effect of Coiling and Annealing Temperature on Nb precipitation, Microstructure and Mechanical Properties of HSLA
Microstructure Characterization and Post-heat Treatment Design for High-Strength Low-alloy Steels Strengthened with Fe2SiTi-L21 Precipitates
Microstructure Property Relationships of Al- alloyed Medium Manganese Steels
Modeling and Experimental Validation of the Precipitation Kinetics of Vanadium Carbide in Austenitic Steel
Modelling of Precipitation and Grain Growth in Ti-Nb Microalloyed Steels
Relationship between Microstructure and Tensile Properties on High Strength Medium Carbon Mo-Nb-B Microalloyed Q/Q&T Steels
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Strain Aging Embrittlement of Structural Steel
Study of the Effect of Accumulative Angular Drawing Process Conditions on Grain Refinement in Selected Stainless Steel Grade
Triple Nano-precipitate Strengthened Austenitic Steel

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