Abstract

The metallography of creep fatigue fracture of conventional type 316 (SUS316) and low carbon medium nitrogen type 316 (316MN) steels has been studied. The creep fatigue lives depend on the grainboundary precipitation during creep fatigue. Coarse carbides in SUS316 would cause grainboundary embrittlement, while very fine Laves phase in 316MN may have no influence. Since carbide precipitation by aging results in loss of matrix strength of SUS316, creep fatigue life increases. On the other hand, the grainboundary precipitation of 316MN is so small and stable that creep fatigue life does not change by aging. The decrease in remaining ductility by loading cycles depends on grainboundary embrittlement by precipitation and work hardening.

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