Abstract
The initiation and propagation behavior of small cracks of SUS 316 stainless steels under low-cycle fatigue loading at 700°C have been studied with a special emphasis on the role of oxidation both in the surface and subsurface. Intergranular cracking in air is due to preferential oxidation attack on the grain boundaries, while in vacuum the most frequent mode of cracking is transgranular. Also, coalescence of cracks in the surface plays an important role in the early stage of crack propagation both in air and vacuum, i. e., irrespective of the oxidation attack. Consequetly, the difference between fatigue life in air and that in vacuum could not be associated with the preferential intergranular cracking in the surface but with the relatively high rate of crack propagation in the depth direction in air compared with that in vacuum.
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