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Investigations have been carried out on the creep behaviour of a 32Ni-27Cr-0.07Ce heat-resistant steel in several S-O bearing environments at 700 C. It was found that the creep strength is reduced if severe corrosion, as was found in the case of the highest S/O ratio, causes a reduction of the load-bearing cross-section. Deformation-induced fingerlike corrosion paths along grain boundaries, which form an alternative corrosion pattern, were less damaging, even when the penetration was deep. Creep ductility was strongly reduced in all environments regardless of the S/O ratio. The formation of sulfide-oxide corrosion products causes rapid crack initiation at the surface and promotes crack propagation.

Additional information

Authors: STROOSNIJDER M F, JRC Ispra (IT);GUTTMANN V, JRC Petten (NL);DE WIT J H W, Delft University of Technology (NL)
Bibliographic Reference: Article: Metallurgical and Materials Transactions A, Vol. 26A (1995) pp. 2103-2110
Record Number: 199511517 / Last updated on: 1995-12-12
Original language: en
Available languages: en