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Xu B.-S.,National Key Laboratory for Remanufacturing
Surface Engineering | Year: 2010

Professor Tom Bell dedicated himself to the establishment of the discipline of surface engineering and contributed greatly to the development of surface engineering in China. This paper briefly overviews the four important stages in the development of surface engineering in China, i.e. single surface engineering, duplex surface engineering, nanosurface engineering and automation. © 2010 Maney Publishing. Source


Cheng J.B.,Hohai University | Cheng J.B.,National Key Laboratory for Remanufacturing | Liang X.B.,National Key Laboratory for Remanufacturing | Xu B.S.,National Key Laboratory for Remanufacturing
Journal of Thermal Spray Technology | Year: 2014

FeBSiNb coatings with a primarily glassy structure were prepared by arc spray processing. The as-sprayed coating was devitrified at various annealing temperatures to form different portions of crystalline phase. The effect of crystallization on the corrosion resistance of the coatings was systematically studied by potentiodynamic polarization and electrochemical impedance spectroscopy analysis in 3.5 wt.% NaCl solution. The results indicate that the as-sprayed coatings exhibit a superior corrosion resistance to the crystallized coatings with high polarization resistance, and the corrosion resistance of the coating deteriorates with the increase in the amount of crystalline phase. The corrosion resistance of both as-sprayed and devitrified coatings is explained in terms of chemical and structural characteristics of the alloys. © 2013 ASM International. Source


Cheng J.B.,Hohai University | Cheng J.B.,National Key Laboratory for Remanufacturing | Liang X.B.,National Key Laboratory for Remanufacturing | Xu B.S.,National Key Laboratory for Remanufacturing
Surface and Coatings Technology | Year: 2014

The microstructure and mechanical properties of the CoCrCuFeNiNb high-entropy alloy coating prepared by plasma transferred arc cladding process were investigated. Two phases are found in the prepared coating with Nb: one is face-centered-cubic solid solution phase; the other is the Laves phase of (CoCr) Nb type. The nano-indentation testing indicates that the microhardness (H), elastic modulus (E), the hardness/modulus of elasticity ratio (H/E ratio) and high resistance to plastic deformation (H3/E2) of the coating with Nb are 6.13GPa, 221GPa, 0.028 and 4.7×10-3 respectively. The CoCrCuFeNiNb coating displays excellent wear and corrosion resistance. The wear resistance of the coating with Nb is about 1.5 times higher than that of the coating without Nb under the same wet sand rubber wheel abrasion testing conditions. Compared with the coating without Nb and as-cast 304 stainless steel, the coating with Nb shows the lowest icorr values in polarization curves and the highest fitted Rf values in EIS plots in 6N hydrochloric acid solution. © 2013 Elsevier B.V. Source


Cheng J.B.,Hohai University | Cheng J.B.,National Key Laboratory for Remanufacturing | Liang X.B.,National Key Laboratory for Remanufacturing | Xu B.S.,National Key Laboratory for Remanufacturing
Surface and Coatings Technology | Year: 2013

FeBSiNb amorphous coatings were synthesized by arc spray processing. The effects of annealing treatments on the microstructure, elastic and mechanical properties of the coatings were investigated. Annealing below 650°C induces the formation of α-Fe phase nanocrystals. Annealing at 650°C promotes the formation of Fe3B, Fe23B6 phases and α-Fe solid solution. The as-sprayed coating displays ultra-high hardness (H>16GPa), high reduced Young's modulus (Er>210GPa) and good wear resistance. These properties are further improved after annealing treatments (H>20GPa and Er>260GPa are achieved in the fully crystallized coating). The mechanical hardening is accompanied with an increase of the ratio of hardness to elastic modulus (H/Er), the yield pressure (H3/Er2) and the elastic recovery (η value). The different microstructural mechanisms responsible for these annealing-induced changes in mechanical and elastic properties are discussed. © 2013 Elsevier B.V. Source


Cheng J.B.,Hohai University | Cheng J.B.,National Key Laboratory for Remanufacturing | Wang Z.H.,Hohai University | Xu B.S.,National Key Laboratory for Remanufacturing
Journal of Thermal Spray Technology | Year: 2012

FeCrBSiNbW coatings were synthesized using robotically manipulating twin wires arc spraying system. The microstructure and mechanical properties of the coating were characterized. The coating has a laminated structure, and its porosity is 2.8%. The microstructure of the coating consists of amorphous and α-(Fe,Cr) nanocrystalline. The nanocrystalline grains with a scale of 20-75 nm are homogenously dispersed in amorphous matrix. The results show that FeCrBSiNbW coating has excellent wear and corrosion resistance. The wear resistance of the coating is about 4.6 times higher than that of 3Cr13 coating under the same testing condition. In 3.5% NaCl aqueous solution, the amorphous/nanocrystalline coating presents lower I corr values in polarization curves and higher fitted R t values in EIS plots than that of the 0Cr18Ni9 coating (chemical composition by EDAX analysis: C1.07-O12.38-Si0.49-Cr15.18-Mn0.89-Ni7.09-Fe62.24 at.%). © 2012 ASM International. Source

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