Monotonic and Low-Cycle Fatigue Response of a Maraging Steel and Metastable beta Titanium Alloy under Torsional Loading
ARMY MATERIALS AND MECHANICS RESEARCH CENTER WATERTOWN MA
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This study deals with the torsional response of Ti-8823 and 18Ni 200 maraging steel. The effect of different heat treatments and the subsequent change in microstructure are investigated. In the case of the Ti-8823, a comparison was made between the solution-treated-and-aged condition, and the direct-aged condition. It was found that the finer precipitate morphology in the DA material offered a greater resistance to torsional fatigue. For the 18Ni 200 maraging steel, an increase of aging time from 3 to 98 hours led to a substantial increase in the amount of reverted austenite, which in turn led to a significant improvement in torsional fatigue behavior. The results are analyzed in terms of the Manson-Coffin equation.
- Properties of Metals and Alloys