| Abstrakt: |
This paper presents the influence of nitrogen ion implantation on the fatigue behavior of AISI 4340. Then the nitrogen ion implantation process was carried out at 100 keV of ion energy and for various ion doses, such as at doses of 1.399×1017 ions/cm2, 2.332×1017 ions/cm2, 3.265×1017 ions/cm2, and 4.198×1017 ions/cm2. The treated specimens were characterized for their hardness using a Vickers micro hardness tester; fatigue using a rotating bending machine; and surface morphology of the cross section of fatigue fracture using an optical microscope. It's found that the optimum hardness is 423.97 VHN, while the surface hardness for raw material is 318.67 VHN, at a stress of 57.409 kg/cm2 and a load of 28 kg, failure occurs in 128300 cycles, while for non-implanted steel, at the same stress, failure occurs at 117200 cycles. This condition was achieved at 2.332×1017 ions/cm2 of ion dose. From the observation that the fracture cross-section of the implanted specimen has a lot of slip lines, it shows a high cycle, which means that the fatigue resistance is higher. From chemical composition analyzed using energy dispersive spectroscopy (EDS), applied to an implanted specimen at 2.332×1017 ions/cm2 of ion dose, the detected nitrogen atom is 8.16 % at. [ABSTRACT FROM AUTHOR] |
