Fatigue of carburized samples / Rashdan Baharom and Muhammad Iqbal Alhadi

Metal failure is a common phenomenon. Most of metal failure is due to fatigue problem. Researchers have been trying to find solutions on how to over come this fatigue problem. The impact of this fatigue problem can be catastrophic, especially in aviation industries. However this fatigue problem cannot be stop, we may only delay the problem or predict when it will going to happen on empirical method, which is known as S-N curves. From these curves safety limit is set and maintenance schedule is set. This project was carried out to study on comparison of non-carburized samples and carburized samples of steel. The carburized samples we divided into two groups that is 3 hours and 6 hours. From the data obtained through fatigue testing, a graph of bending stress vs. no of cycles was plotted. Microstructures studies were also conducted to determine the phases and thickness of carburized layer from different samples. Crack initiation sites were determined through Scanning Electron Microscope (SEM).