Affiliation:
1. *Science and Technology on Reactor Fuel and Materials Laboratory, Nuclear Power Institute of China, Chengdu 610213, China.
Abstract
Fatigue crack growth (FCG) in Z2CND18-12N austenitic stainless steel and its heat-affected zone (HAZ) in the Z2CND18-12N/16MND5 dissimilar metal weld joint has been investigated in room temperature air and 325°C water. The dependence of FCG rates on specimen orientation in room temperature air got somewhat evident as ΔK decreased to 13 MPa√m. However, for Z2CND18-12N steel, the influence of specimen orientation on the FCG in room temperature air and the corrosion fatigue crack growth (CFCG) in 325°C water was slight and negligible. A moderate increase in the FCG rate was observed for the Z2CND18-12N HAZ in room temperature air at a low ΔK = 13 MPa√m (near ΔK threshold), compared with its base metal. However, the CFCG rate difference between the Z2CND18-12N HAZ and its base metal was minor. The CFCG in the Z2CND18-12N in 325°C water (without the addition of H2) was consistent with a slip-oxidation-rupture mechanism and the oxide film on the corrosion fatigue crack tip mainly consisted of Fe3O4.
Publisher
Association for Materials Protection and Performance (AMPP)
Subject
General Materials Science,General Chemical Engineering,General Chemistry