Evaluation of Fatigue Properties of Additively Manufactured High-Entropy Alloys

In recent years, additive manufacturing (AM) has been attracting attention in order to reduce the weight and improve the functionality of automobiles. However, the AM has the problem that its fatigue strength is lower than its tensile strength. For this reason, it is difficult to apply this technology to strength parts. Currently, there are many reports on fatigue strength improvement methods for steel materials, but there are few reports on fatigue strength improvement methods for AM materials. Therefore, in this study, we focused on the amount of defect and shot peening to elucidate their effects on fatigue strength. Consequently, the fatigue limit increased with a decrease of defect amount. However, no improvement of fatigue life in the finite life region was observed. The fatigue strength was improved by shot peening.