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A duplex treatment, i.e. plasma nitriding followed by closed field unbalanced magnetron sputter ion plating, is used to strengthen the bonding of CrTiAlN coatings to H13 steels in the paper. A nitride layer is first formed on H13 steel samples by plasma nitriding and then two chromium transition layers are prepared on the surface of the nitrided H13 steels using closed field unbalanced magnetron sputter...
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