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The e zone is hardened by the formation of the Fe3N compound, and below this layer there is some solid solution strengthening from the nitrogen in solid solution.



The profile of Vickers hardness HV0.3 through the nitrided layer was measured perpendicular to the surface and with 0.02 mm of distance among the prints. The following values were measured from the surface: 1083,1277, 1163, 1252, 1142, 977, 784, 564 HV0.3. From the profile of hardness determined thickness of nitrided  layer was Nht ¡« 0.14 mm.
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