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QPQ salt bath treatment of 45 steel was conducted by nitriding at 565°C for various time (60min, 90min, 120min, 150min and 180min), followed by the same post-oxidation process with heating temperature of 430°C and holding duration of 40min. Characterization of modified surface layers was made by means of optical microscopy, microhardness test, X-ray diffraction analysis, corrosion and wear resistance...
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