It has been well known that fatigue properties of steels are improved by grain refinement. In the STX-21 project, we have been developing low carbon steels with sub-micron meter grain sizes and reported that their tensile strength is 800 MPa and DBTT is around 77K. In this report, low- and high-cycle fatigue properties of ultrafine-grained steels with different grain diameters of 0.7 and 0.9 μm and different carbon contents of 0.05 and 0.15 mass% were investigated. The grain refinement improved high-cycle fatigue properties, whereas it did not affect low-cycle fatigue properties. Fatigue limit showed the similar Hall-Petch type relationship for several studies carried out hitherto.
|ジャーナル||Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan|
|出版ステータス||出版済み - 6 2003|
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