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| 1 | NON-EQUILIBRIUM SOLUTE SEGREGATION TO AUSTENITIC GRAIN BOUNDARY IN FERRUM-NICKLE ALLOY显示文摘The development of non-equilibrium segregation of boron at grain boundaries in Fe-4 0%Ni alloy during continuous cooling process was experimentally observed with boron Particle Tracking Autoradiography (PTA) and Transmission Electron Microscopy (TEM,). The samples with 10ppm boron were cooled at 2℃/s to 1040, 980, 920, 860, 780 and 640℃ respectively after pre-heat treatment of 1150℃ for 15mm with a Gleeble-1500 heat simulating machine, then water quenched to room temperature. The width of segregation layer and boron depletion zone, rich factor and other parameters were measured by a special image analysis system. The experimental results of PTA show that the grain boundary segregation of boron during cooling process is a dynamic process and the development of the non-equilibrium segregation experiences three stages: first increases rapidly from 1150 to 1040℃, then gently from 1040 to 860℃, and rapidly again from 860℃ to 640℃. The width of boron depletion zone increases from about 11μm at 1040℃ to 26μm at 640℃. TEM observation shows that boron precipitates exist at grain boundaries when the samples are cooled to below 860℃. The experimental phenomena are briefly discussed. | P. Wu, D.Y. Yu and X.L. He (Department of Material Physics, University of Science & Technology Beijing, Beijing 100083, China) | 2001 | Acta Metallurgica Sinica(English Letters)2001，14，6： | 2 |
| 2 | THERMAL STABILITY OF NON-EQUILIBRIUS MICROSTRUCTURE IN MICROALLOYED STEEL DURING REHEATING显示文摘Cooled in water after isothermal relaxation of deformed austenite for different times, an Nb-bearing microalloyed steel always exhibits synthetic microstructures, in which bainitic ferrite dominates. Dislocation configurations and distributions of strain induced precipitates inside bainitic ferrite of samples relaxed for different times were distinct. When compared with the austenite model steel, which maintained fcc structure even at room temperature, the strain induced precipitates were not found in the sample without relaxation whereas these were distributed outside dislocations in sample relaxed for 1000s. Most of the strain induced precipitates distribute along dislocations and pin dislocations in sample relaxed for appropriate time. After bainitic transformation, the dislocations formed in deformed austenite remain to be pinned by the precipitates. When these samples were reheated to and held at 650 or 700℃, the non-equilibrious microstructures tended to evolve into equilibrious ones. The sample relaxed for 60s displayed the highest thermo-stability, whereas microstructure evolution was the quickest in the sample relaxed for 1000s even though it was the softest prior to reheating. Dislocations inside laths got rid of pinning of precipitates, and their polygonization became the precursor to the evolution of microstructures during reheated and held, followed by gradual disappearance of lath boundaries caused by dislocation climbing. Finally, recrystallization occurred and polygonal ferrite appeared. By hardness measurement, it was found that softening is not a single process occurring during reheated, in which hardness fluctuates with time. There were two peaks in the hardness-time curve of each sample having undergone relaxation, while single peak occured in the curve of the sample not being relaxed. These results indicated that the thermo-stability of microstructures was determined by their history of formation to a considerable degree. | H.B. Wu H.T. Jiang S.W. Yang D. Tang X.L. He | 2007 | Acta Metallurgica Sinica(English Letters)2007，20，5： | 2 |
| 3 | Experimental study on the performance of a novel structure for two-phase flow distribution in parallel vertical channels显示文摘 | P. Yuan G.B. Jiang Y.L. He X.L. Yi W.Q. Tao | 2012 | International Journal of Multiphase Flow2012，，： | 1 |
| 4 | 查看详情显示文摘 | Zhai X Zhang C.L He L Li Q. Wang J.L.Shen X.L. Gong P | | 0，，04： | 1 |
| 5 | CORROSION BEHAVIORS OF THE EXPOSED SIDE AND UNDERSIDE OF LOW ALLOY WEATHERING STEEL IN QINGDAO AND WANNING FOR 18 MONTHS显示文摘For 18 months, a newly developed low alloy weathering steel has been exposed in two coastal sites (Qingdao in the north China, Wanning in the south China). The different corrosion behaviors of the exposed side and the underside of the samples were characterized by X-ray diffraction (XRD), polarization curve, electrochemical impedance spectroscopy (EIS), scanning electron microscopy (SEM), and N2 adsorption approach. It was found that the samples exhibited higher corrosion rate in Wanning than that in Qingdao. The underside of the samples corrodes more seriously than the exposed side in Qingdao, whereas the result in Wanning is just the reverse. The protection performance of rust layers mainly depends on its compactness and the enrichment of Cu and Cr is a secondary causation. The different compactness of rust layers in the exposed side and the underside originates from different corrosion conditions of the two sides. | S. T. Wang S. W. Yang K. W. Gao X.L. He | 2008 | Acta Metallurgica Sinica(English Letters)2008，21，6： | 1 |
| 6 | Effect of zirconium addition on the impact toughness of the heat affected zone in a high strength low alloy pipeline steel显示文摘 | A.M. Guo S.R. Li J. Guo P.H. Li Q.F. Ding K.M. Wu X.L. He | 2006 | Materials Characterization2006，，2： | 1 |
| 7 | 查看详情显示文摘 | Wan Q Li Q.H Chen Y.J Wang T.H. He X.L. Li J.P.Lin C.L | | 0，，： | 1 |
| 8 | Combined evaluation of centromere protein H and Ki-67 as prognostic biomarker for patients with gastric carcinoma显示文摘 | W.L. He Y.H. Li D.J. Yang W. Song X.L. Chen F.K. Liu Z. Wang W. Li W. Chen C.Y. Chen Y.L. He W.H. Zhan | 2012 | European Journal of Surgical Oncology2012，，： | 1 |
| 9 | Combined evaluation of centromere protein H and Ki-67 as prognostic biomarker for patients with gastric carcinoma显示文摘 | W.L. He Y.H. Li D.J. Yang W. Song X.L. Chen F.K. Liu Z. Wang W. Li W. Chen C.Y. Chen Y.L. He W.H. Zhan | 2012 | European Journal of Surgical Oncology2012，，： | 1 |
| 10 | Cloning, expression and functional analysis of HMW glutenin subunit 1By8 gene from Italy pasta wheat ( Triticum turgidum L. ssp. durum )显示文摘 | Y.M. Yan Y. Jiang X.L. An Y.H. Pei X.H. Li Y.Z. Zhang A.L. Wang Z. He X. Xia F. Bekes W. Ma | 2009 | Journal of Cereal Science2009，，3： | 1 |
| 11 | Effect of zirconium addition on the impact toughness of the heat affected zone in a high strength low alloy pipeline steel显示文摘 | A.M. Guo S.R. Li J. Guo P.H. Li Q.F. Ding K.M. Wu X.L. He | 2006 | Materials Characterization2006，，2： | 1 |
| 12 | The metastable austenite transformation in Mo–Nb–Cu–B low carbon steel显示文摘 | Y.T. Zhao C.J. Shang S.W. Yang X.M. Wang X.L. He | 2006 | Materials Science & Engineering A2006，，： | 1 |
| 13 | An experimental investigation on a novel high-performance integrated heat pipe–heat sink for high-flux chip cooling显示文摘 | X.L. Xie Y.L. He W.Q. Tao H.W. Yang | 2007 | Applied Thermal Engineering2007，，5： | 1 |
| 14 | A Quantitative Analysis of Mn Segregation at Partitioned Ferrite/Austenite Interface in a Fe-C-Mn-Si Alloy显示文摘Mn segregation at austenite/ferrite interface is studied in a Fe-C-Mn-Si alloy held at 656℃. Mn is partitioned during the growth of ferrite and as a result, a Mn pile-up exists in front of interface on the matrix side. An approach to evaluate Mn segregation quantitatively is developed by combining STEM raster window scanning and simulation of the interaction of the electron beam with the sample to subtract the contribution of Mn pile-up and obtain pure Mn segregation value. The evaluated maximum Mn interfacial segregation is in the order of a half-monolayer. | H. Guo S.W. Yang C.J.Shang X.M. Wang X.L. He | 2009 | Journal of Materials Science & Technology2009，25，3： | 0 |
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