In this article, the influence of plasma nitriding on the fatigue behavior and fracture mechanisms of the GJS700 nodular cast iron has been investigated. Factors contributing to this influence, which included the microstructure, the phase detection, the surface roughness, and the hardness of the plasma‐nitrided specimens were discussed. Moreover, rotating‐bending high‐cycle fatigue testing was also done on standard samples, and then the field‐emission scanning electron microscopy was also utilized to find the failure mechanism on fracture surfaces. Obtained results demonstrated that the average surface roughness and the Vickers micro‐hardness increased by plasma nitriding, compared to the base material. However, fatigue lifetimes decreased in plasma‐nitrided samples due to the increase in the surface roughness and the formation of a compound layer. On the fracture surface, micro‐cracks, cleavage planes, and fatigue striations were observed. Debonding of the graphite from the matrix in all specimens was a dominant cause of the failure.
In this article, high-cycle fatigue properties of the EN-GJS700-2 ductile cast iron were experimentally examined, using the four-point rotary-bending fatigue machine. Such material has been widely utilized for manufacturing crankshafts in automotive industries. Therefore, standard specimens were extracted from the crankshaft to consider the manufacturing effect. The other aim of this work is to develop a model, anticipating the probabilistic behavior of the EN-GJS700-2 ductile cast iron. For such objective, the parametric analysis of the most commonly used statistical distributions were performed and compared. Based on the best fitted distribution function on experimental data, fatigue lifetime reliability specifications of the material were analyzed and represented through probabilistic modeling. In addition, the S-N diagram with its scatter-band were conducted at different values of the confidence level. As another investigation, the criterion for designing the crankshaft is the infinite lifetime, or in more practical terms, is the design with allowable stress levels, below the fatigue limit. Based on the staircase test methodology, fatigue endurance limit tests were conducted. Then, statistical trends of the fatigue limit were analyzed by the Dixon-Mood method, based on the maximum likelihood estimation. Obtained results represents that the fatigue limit was 211 MPa for the ductile cast iron.
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