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This study applied friction stir welding to an ultrahigh carbon steel consisting of a (ferrite+cementite) duplex structure using polycrystalline cubic boron nitride tool and successfully produced a defect-free weld. The microstructure and the hardness profile of the weld were examined, and the microstructural evolution during friction stir welding was systematically discussed.
The high-pressure, pulsed glow discharge has been studied for further understanding of the excitation discharge on excimer lasers. The influences of shock waves on the discharge have been investigated eliminating the other factors, which may affect the discharge instabilities, such as gas density depletion, discharge products, residual ions and electrode heating. A shock wave of 1.2 in Mach number...
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