PSI - Issue 33

Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2019) 000–000

www.elsevier.com/locate/procedia

ScienceDirect

Procedia Structural Integrity 33 (2021) 802–808

© 2021 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the IGF ExCo 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. 021 The Authors. Published by ELSE IER B.V. is is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) eer-review Statement: Peer-review under responsibility of the scientific committee of the IGF ExCo. Keywords: 10CrNi3MoV steel; fatigue crack growth; as welds; R-ratio effect; material heterogeneity 1. Introduction For most heavy-loading engineering welded structures and components, such as mine excavators, truck cranes, ships, and marine structures, High Strength Steel (HSS) or Ultra-High Strength Steel (UHSS) has an increasing IGF26 - 26th International Conference on Fracture and Structural Integrity Fatigue crack growth rates of 10CrNi3MoV steel welded joints considering the stress ratio Wei Song a,  , Jingjing Li a , Xuesong Liu b , Ping Wang c , Di Wan d , Filippo Berto d a School of Mechanical & Electrical Engineering, Xuzhou University of Technology, Xuzhou 221018, PR China. b State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China. c School of Ocean Engineering, Harbin Institute of Technology, Weihai 264209, China d Department of Mechanical and Industrial Engineering, Norwegian University of Science and Technology (NTNU), Richard Birkelands vei 2b, 7491 Trondheim, Norway.

 Corresponding author. E-mail address: swingways@hotmail.com

2452-3216 © 2021 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review Statement: Peer-review under responsibility of the scientific committee of the IGF ExCo

2452-3216 © 2021 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the IGF ExCo 10.1016/j.prostr.2021.10.089