Macroscopic characteristics of plasma-nitrided AISI 4340 steel
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Plasma-nitrided AISI 4340 steel, in a low-pressure abnormal glow discharge was studied. The layer formation and their characteristics, were studied as a function of the main macroscopic parameters of the gas discharge: gas flow, N2/H2 mixture, treatment time and sample temperature. The nitrided layers were characterized using a metallographic microscope coupled to a microhardness tester and X-ray techniques. Typical results obtained for samples which were nitrided for 2 h in a gas mixture of 0.9N2+0.1 H2 at 793 K, showed a white layer composed of ε and γ′ phases, 20 μm thick, and a 1100 HV20 microhardness.
KeywordsNitrided Treatment Time Sample Temperature Glow Discharge Typical Result
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