Journal article
Effect of Composition and Deformation on Coarse-Grained Austenite Transformation in Nb-Mo Microalloyed Steels
Metallurgical and materials transactions. A, Physical metallurgy and materials science, v 42A(12), pp 3729-3742
01 Dec 2011
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Abstract
Thermomechanical processing of microalloyed steels containing niobium can be performed to obtain deformed austenite prior to transformation. Accelerated cooling can be employed to refine the final microstructure and, consequently, to improve both strength and toughness. This general rule is fulfilled if the transformation occurs on a quite homogeneous austenite microstructure. Nevertheless, the presence of coarse austenite grains before transformation in different industrial processes is a usual source of concern, and regarding toughness, the coarsest high-angle boundary units would determine its final value. Sets of deformation dilatometry tests were carried out using three 0.06 pct Nb microalloyed steels to evaluate the effect of Mo alloying additions (0, 0.16, and 0.31 pct Mo) on final transformation from both recrystallized and unrecrystallized coarse-grained austenite. Continuous cooling transformation (CCT) diagrams were created, and detailed microstructural characterization was achieved through the use of optical microscopy (OM), field emission gun scanning electron microscopy (FEGSEM), and electron backscattered diffraction (EBSD). The resultant microstructures ranged from polygonal ferrite (PF) and pearlite (P) at slow cooling ranges to bainitic ferrite (BF) accompanied by martensite (M) for fast cooling rates. Plastic deformation of the parent austenite accelerated both ferrite and bainite transformation, moving the CCT curves to higher temperatures and shorter times. However, an increase in the final heterogeneity was observed when BF packets were formed, creating coarse high-angle grain boundary units.
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Details
- Title
- Effect of Composition and Deformation on Coarse-Grained Austenite Transformation in Nb-Mo Microalloyed Steels
- Creators
- N. Isasti - Universidad de NavarraD. Jorge-Badiola - Universidad de NavarraM. L. Taheri - Drexel UniversityB. Lopez - Universidad de NavarraP. Uranga - Universidad de Navarra
- Publication Details
- Metallurgical and materials transactions. A, Physical metallurgy and materials science, v 42A(12), pp 3729-3742
- Publisher
- Springer Nature
- Number of pages
- 14
- Grant note
- NSF; National Science Foundation (NSF) MAT2009-09250 / Spanish Science and Innovation Department TMS University of Navarra
- Resource Type
- Journal article
- Language
- English
- Web of Science ID
- WOS:000297252800025
- Scopus ID
- 2-s2.0-83155188319
- Other Identifier
- 991019335235204721
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Materials Science, Multidisciplinary
- Metallurgy & Metallurgical Engineering