Abstract
This study mainly investigates the Fatigue Crack Growth Rate (FCGR) of 10CrNi3MoV high strength steel and its welded joints used in modern marine environment considering the stress ratio and strength mismatch. To reflect the strength mismatch of weldment, two kinds of weld filler material are selected to obtain Even-Matched (EM) and Under-Matched (UM) marine Ni-Cr-Mo-V steel welded joints. The Fatigue Crack Growth (FCG) rates of base metal and related welded joints are investigated considering load ratio (0.1, 0.4, 0.7) and post-welding heat treatment. The experimental FCG trends for base metal and weldments have been compared with the trends available in standards. The FCG rate (da/dN) results show fatigue crack propagation resistance under post welded heat treatment (PWHT) is lower than the as-welded state for both EM and UM welded joints.
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