Document Type : Research Paper
Authors
1
Department of Mining and Metallurgical Engineering, Yazd University, University Blvd, Safayieh, Yazd, PO Box: 98195 – 741, Iran
2
Department of Mining and Metallurgical Engineering, Yazd University, University Blvd, Safayieh, Yazd, PO Box: 98195 – 741, Iran
10.22034/ijissi.2024.2019093.1276
Abstract
One of the most crucial factors influencing the strength and quality of steels is the presence of non-metallic inclusions. Studies demonstrated that the existence of non-metallic inclusions in industrial parts diminishes their fatigue strength. On the other hand, another influential parameter affecting the fatigue strength of steels is their hardness. Therefore, this research investigated the impact of non-metallic inclusions on the fatigue strength of AISI 304 steel with three hardness of 170, 250, and 330 Vickers. The findings of this research revealed that as the hardness decreases, the fatigue strength of the part also decreases. Additionally, an examination of the failure surfaces of the parts using scanning electron microscopy (SEM) indicates that non-metallic inclusions are the root cause of fatigue failure in the samples. Finally, employing Murakami relations, parameters such as stress concentration factor and critical inclusion size were determined for steel with hardness levels of 170, 250, and 330 Vickers. The critical inclusion size for steel with hardness levels of 170, 250, and 330 Vickers was calculated as 32.7, 24.8, and 15 micrometers, respectively.
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