Hongying Sun
University of Science and Technology Beijing
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Publication
Featured researches published by Hongying Sun.
Journal of Iron and Steel Research International | 2014
Hongying Sun; Zhangjian Zhou; Man Wang; Xiao Li
Hot compression tests were conducted in a temperature range of 800 – 1100 °C and strain rate range of 0. 1 – 10 s−1 using a Gleeble 3500 thermomechanical simulator to investigate the influence of hot deformation parameters (temperatures, strain rates and strains) on the grain boundary network evolution of a new grade Fe-Cr-Ni superaustenitic stainless steel. The results showed that a dominant effect of deformed temperature is Σ3n (n=0, 1, 2, 3) boundaries population increased with decreasing temperature, while they first increased and then reduced with in-creasing strain and strain rate. Interestingly, besides Σ3n (n=0, 1, 2, 3) twin grain boundaries, some Σ1 boundaries could interrupt grain boundaries network effectively, which enhance material performances. But they are scarcely reported. The misorientation of some segments LAGBs in the deformed microstructure (pancaked grains) increased and slid to high angle grain boundaries with increasing the fraction of recrystallized grains during hot deformation.
Journal of Iron and Steel Research International | 2016
Hongying Sun; Qiang He; Zhangjian Zhou; Man Wang; Guangming Zhang; Shao-fu Li
The oxidation morphologies of modified 310 steel exposed in 900 and 1100 °C air were investigated. A double layer morphology consisting of a (Cr, Mn)-rich outer layer and a fine Cr-rich inner layer was formed at 900 °C. It was related to the breakaway oxidation induced by the Cr-depletion and the Mn-segregation in inner layer. Some Cr-rich oxides with amorphous state were formed along grain boundaries. And some new finer oxide grains, voids and Cr-rich precipitates were observed in spallation areas at 1100 °C. Correspondingly, the oxidation kinetic curve dropped with the spallation of scale and increased with the formation of some new oxide grains. It was caused by segregation of Cr and the transformation of oxides from Cr2O3 to the volatile oxides at elevated temperature. XRD analysis showed that the precipitates were mainly composed of CrO3. Segregation and depletion for solutions were also discussed by oxidation diffusion mechanisms.
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing | 2013
Man Wang; Zhangjian Zhou; Hongying Sun; Helong Hu; Shaofu Li
Materials & Design | 2015
Hongying Sun; Yongduo Sun; Ruiqian Zhang; Man Wang; Rui Tang; Zhangjian Zhou
Materials & Design | 2014
Hongying Sun; Yongduo Sun; Ruiqian Zhang; Man Wang; Rui Tang; Zhangjian Zhou
Materials & Design | 2016
Shun Li; Z.J. Zhou; P.H. Wang; Hongying Sun; M. Wang; Guangming Zhang
Journal of Nuclear Materials | 2012
Man Wang; Zhangjian Zhou; Hongying Sun; Helong Hu; Shaofu Li
Powder Technology | 2015
Man Wang; Hongying Sun; Lei Zou; Guangming Zhang; Shaofu Li; Zhangjian Zhou
Journal of Nuclear Materials | 2014
Guangming Zhang; Zhangjian Zhou; Hongying Sun; Lei Zou; Man Wang; Shaofu Li
Journal of Nuclear Materials | 2014
Shaofu Li; Zhangjian Zhou; Jinsung Jang; Man Wang; Helong Hu; Hongying Sun; Lei Zou; Guangming Zhang; Liwei Zhang