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Effect of Long Time Isothermal After Deformation on Tempering Microstructure and Nanometer Precipitation in Nb-Bearing Micro-Alloyed Steel

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Thermo-simulation test, measurement of hardness and transmission electron microscopy (TEM) were applied to investigate the variation of microstructure along with precipitation behavior during tempering at 525 °C after long time isothemal in deformed Nb-bearing micro-alloyed steel. The results indicate that the microstructure remains nearly unchanged until 1200 min. The hardness decreases gradually after water-quenching tempering for 120 min, and then increases continuously until 1200 min. The coarsened strain-induced nanometer precipitates formed in deformed austenite almost in the same size even tempering for long time. While the further precipitates, which nucleate in phase, contribute to the increasing of hardness curves.
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Keywords: LONG TIME ISOTHERMAL; NANOMETER PRECIPITATION; NB MICRO-ALLOYED STEEL; TEMPERING

Document Type: Research Article

Publication date: September 1, 2012

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  • Journal of Computational and Theoretical Nanoscience is an international peer-reviewed journal with a wide-ranging coverage, consolidates research activities in all aspects of computational and theoretical nanoscience into a single reference source. This journal offers scientists and engineers peer-reviewed research papers in all aspects of computational and theoretical nanoscience and nanotechnology in chemistry, physics, materials science, engineering and biology to publish original full papers and timely state-of-the-art reviews and short communications encompassing the fundamental and applied research.
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