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    ABSTRACT: Fe/SiC bulk nanocomposites were fabricated by selective laser melting (SLM) directly from a simple mixture of microsized Fe and SiC. Uniformly dispersed nanosized SiC particles with a mean particle size of 78 nm were obtained and fine homogeneous needle-shaped martensite and partial pearlitic microstructures were observed in different planes of the SLM-fabricated Fe/SiC composites. The Fe/SiC nanocomposite exhibits much higher strength than pure Fe sample, with an ultimate tensile strength of up to 753 ± 49 MPa.
    Scripta Materialia 03/2014; 75:90–93.
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    ABSTRACT: In this paper, a novel adaptive-gain Second Order Sliding Mode (SOSM) observer is proposed for multicell converters by considering it as a class of hybrid systems. The aim is to reduce the number of voltage sensors by estimating the capacitor voltages only from the measurement of load current. The proposed observer is proven to be robust in the presence of perturbations with \emph{unknown} boundary. However, the states of the system are only partially observable in the sense of observability rank condition. Due to its switching behavior, a recent concept of $Z(T_N)$ observability is used to analysis its hybrid observability, since its observability depends upon the switching control signals. Under certain condition of the switching sequences, the voltage across each capacitor becomes observable. Simulation results and comparisons with Luenberger switched observer highlight the effectiveness and robustness of the proposed observer with respect to output measurement noise and system uncertainties (load variations).
    Control Engineering Practice 11/2013;
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    ABSTRACT: A commercially pure Ti part was produced using self-developed vacuum selective laser melting system. A smooth surface with roughness Ra 5 μm can be obtained due to avoiding balling process. The density value of the samples with low laser scanning velocity was the same as the theoretical density value. The evolution of microstructural feature is also observed with increasing scanning velocity. The phase transformation was shown as follows: fine and homogenous α → irregular acicular martensite α′ → refined zigzag martensite a″.
    Vacuum 09/2013; 95:25–29.

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    Belfort, France
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