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您的检索式：作者名="ShanwuYang"
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| 1 | Behavior of precipitation in bainitic steel during relaxation processing of RPC technique显示文摘Thermal simulation test, TEM (Transmission Electron Microscope) and nanobeam EDS (Energy Dispersed x-ray Spectrum) techniques were used to investigate the precipitation behavior of Nb, Ti, Mo etc. In HSLA (High Strength Low Alloy) steel.The strain induced precipitation occurred during the isothermal relaxation stage after deformed in the non-recrystallization temperature region. After 30% predeformation at 850 and 900℃, there are two kinds of particles, (Ti,Nb)(C,N) and a few Nb(C,N), to precipitate during holding. The content of Nb in particles rises with the relaxation time increasing. During the final holding stage, some Nb and Ti atoms in the lattice sites of the precipitates would be replaced by Mo atoms, and the Mo content in the precipitates increases with the relaxation time. The results were compared with the refinement effect of microstructures caused by relaxationprecipitation controlling transformation (RPC) processing. | ShanwuYang ShaoqiangYuan: XueminWang HuibinWu XinlaiHe | 2004 | Journal of University of Science and Technology Beijing2004，11，3： | 7 |
| 2 | Over-relaxation effect of deformed austenite on ageing behavior of an Nb-bearing microalloyed steel显示文摘The ageing behavior of an Nb-bearing microalloyed steel at 525℃ was investigated by thermo-simulation test, hardness measurements and transmission electron microscopy (TEM). Prior to ageing, the steel was deformed in austenite zone followed by a long relaxation. Experimental results indicate that the hardness decreases gradually in the initial stage until ageing for 120 min, and then increases continuously until 1200 min. The coarsened precipitates (>10 nm) formed in deformed austenite remain nearly unchanged in size, even after ageing for long time, while the further precipitates, which nucleate in α phase, contribute to the increasing of hardness. By comparison, the undeformed samples in austenite subjected to the same ageing process display a very similar hardness change trend to that of over-relaxation ones and have higher hardness values at each corresponding period. | ShaoqiangYuan ShanwuYang XueminWang XinlaiHe | 2005 | Journal of University of Science and Technology Beijing2005，12，3： | 4 |
| 3 | Thermo-stability of ultra-fine non-equilibrium microstructures显示文摘The evolution of the microstructures and hardness of a bainitic plate steel during tempering at 650℃ has been investigated.The steel was manufactured by RPC (relaxation-precipitation controlling phase transformation) technique. A part of the plate was reheated to 930℃ and held for 1 h before quenched into water (RQ). No obvious change was detected by means of optical microscopy in the RPC steel tempering for 0.5 h, while dislocation cells were formed inside the bainite laths, accompanied by an obvious drop of hardness. The bainite laths started to coalesce in some regions, but the sample hardness kept nearly constant during tempering from 1 to 7 h. With further tempering, polygonal ferrite was formed in local regions while the hardness decreased dramatically. The RQ samples softened faster during tempering and finally transformed into the polygonal ferrite completely. These results indicate that the thermo-stability of fine non-equilibrium microstructures is tightly related to their history. | HuibinWu ShanwuYang AiminGuo ShaoqiangYuant ChengjiaShangt XinlaiHe | 2004 | Journal of University of Science and Technology Beijing2004，11，4： | 1 |
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