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In-situ synthesized WC particles reinforced Fe-based composite coating was prepared by argon arc cladding on Q235 with mixture of tungsten powders, graphite and iron powders mainly. Microstructures of coating were investigated using SEM, EDS and XRD. Micro-hardness and wear resistance were also studied. The result showed that the main phases of coating were WC, Fe3W3C, martensite and residual austenite. The WC particles were well distributed in matrix and appeared significant growth and reunion from bottom to top of coating. Hardness of the coating ranged between HV0.2 1102.2 to 1863.5. The wear loss of Q235 steel was 37.2 times than that of the coating.

      Genetic algorithm is a combinatorial optimization problem solving in the field of search algorithm, because of its versatility and robustness, it has been widely used in various fields of science. However, there are some defects in traditional genetic algorithm. for its shortcomings, this paper proposed an improved genetic algorithm for multi-objective Flexible JSP (job shop scheduling) problem. The algorithm construct the initial solution based on judging similarity strategy and immune mechanisms, proposed a self-adaptation cross and mutation operator, and using simulated annealing algorithm strategy combined with immune mechanisms in the selection operator, the experiment proof shows that, the improved genetic algorithm can improve the performance.

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