Journal article
Microstructural Features Controlling Mechanical Properties in Nb-Mo Microalloyed Steels. Part I: Yield Strength
Metallurgical and materials transactions. A, Physical metallurgy and materials science, v 45A(11), pp 4960-4971
01 Oct 2014
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Abstract
Low carbon Nb-Mo microalloyed steels show interesting synergies between the "micro"-alloying elements when high strength-high toughness properties are required. Strain accumulation in austenite is enhanced, and therefore grain sizes are refined in the final microstructures. The presence of Mo facilitates the presence of non-polygonal phases, and this constituent modification induces an increment in strength through a substructure formation as well as through an increase in the dislocation density. Regarding fine precipitation and its strengthening effect, the mean size of NbC is reduced in the presence of Mo and their fraction increased, thus enhancing their contribution to yield strength. In this paper, a detailed characterization of the microstructural features of a series of microalloyed steels is described using the electron-backscattered diffraction technique. Mean crystallographic unit sizes, a grain boundary misorientation analysis, and dislocation density measurements are performed. Transmission electron microscopy is carried out to analyze the chemical composition of the precipitates and to estimate their volume fraction. In this first part, the contribution of different strengthening mechanisms to yield strength is evaluated and the calculated value is compared to tensile test results for different coiling temperatures and compositions.
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Details
- Title
- Microstructural Features Controlling Mechanical Properties in Nb-Mo Microalloyed Steels. Part I: Yield Strength
- Creators
- Nerea Isasti - Universidad de NavarraDenis Jorge-Badiola - Universidad de NavarraMitra L. Taheri - Drexel UniversityPello Uranga - Universidad de Navarra
- Publication Details
- Metallurgical and materials transactions. A, Physical metallurgy and materials science, v 45A(11), pp 4960-4971
- Publisher
- Springer Nature
- Number of pages
- 12
- Grant note
- PI2011-17 / Basque Government MAT2009-09250; MAT2012-31056 / Spanish Ministry of Economy and Competitiveness; Spanish Government
- Resource Type
- Journal article
- Language
- English
- Web of Science ID
- WOS:000341086700029
- Scopus ID
- 2-s2.0-84906778696
- Other Identifier
- 991019330913304721
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Materials Science, Multidisciplinary
- Metallurgy & Metallurgical Engineering