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Effects of Heat-Treatment Temperature on the Microstructure and Mechanical Properties of Steel by MgO Nanoparticle Additions

1
School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China
2
School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
*
Authors to whom correspondence should be addressed.
Materials 2018, 11(9), 1707; https://doi.org/10.3390/ma11091707
Received: 9 August 2018 / Revised: 4 September 2018 / Accepted: 9 September 2018 / Published: 13 September 2018
The characteristics and formation mechanisms of intragranular acicular ferrite (IAF) in steel with MgO nanoparticle additions were systematically investigated for different isothermal heat-treatment temperatures, and its influence on mechanical properties was also clarified. The results indicate that the inclusions were finely dispersed and refined after adding MgO nanoparticles. In addition, with decreasing heat-treatment temperature, the microstructure changed from grain boundary ferrite (GBF) and polygonal ferrite (PF) to intragranular acicular ferrite. Moreover, the steel with MgO additions had excellent mechanical properties in the temperature range of 973 to 823 K and an average Charpy absorbed energies value of around 174 J at 873 K due to the significant refinement of the microstructure and nucleation of intragranular acicular ferrite. View Full-Text
Keywords: microstructure; oxide metallurgy; mechanical properties; intragranular acicular ferrite microstructure; oxide metallurgy; mechanical properties; intragranular acicular ferrite
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Zhou, Y.; Yang, S.; Li, J.; Liu, W.; Dong, A. Effects of Heat-Treatment Temperature on the Microstructure and Mechanical Properties of Steel by MgO Nanoparticle Additions. Materials 2018, 11, 1707.

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