The influence of the sulfur/oxygen ratio in the environment on the creep and creep damage behavior of a heat-resistant steel
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Abstract
Investigations have been carried out on the creep behavior 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 load-bearing cross section. Deformation-induced fingerlike corrosion paths along grain boundaries, which form an alternate 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.
Keywords
Material Transaction Surface Crack Creep Strength Creep Damage Alloy 800H
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