Experimental characterization of short crack nucleation and growth during cycling in lean duplex stainless steels |
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| Affiliation: | 1. Instituto de Física Rosario – CONICET, Universidad Nacional de Rosario, Argentina;2. Faculty of Engineering and Computer Science, University of Applied Sciences Osnabrück, Germany;1. Department of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, China;2. State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China;3. Atlantic China Welding Concumables, Inc., Zigong 643000, China;1. College of Materials Science and Engineering, Jilin University, Changchun 130025, PR China;2. State Key Lab Automot Simulat & Control, Jilin University, Changchun 130025, PR China;3. Sinotest Equipment Co.,ltd., Changchun 130103, PR China |
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| Abstract: | Considering that many applications of Lean Duplex Stainless Steels (LDSSs) involve cyclic loading, the aim of this paper is to study short crack initiation and growth during low (LCF) and high cycle fatigue (HCF) in AL 2003 (UNS S32003). Electron Backscattered Diffraction (EBSD) analysis of plastically active grains allows to determinate the slip systems and their associated Schmid factor (SF). Additionally, the dislocation structure developed during cycling is observed by transmission electron microscopy (TEM). Whereas in HCF cracks nucleate at grains boundaries, during LCF cracks nucleate along intrusion/extrusions in ferritic grains and as they reach austenitic grains grow along active slip systems or by double slip system. Moreover, phase boundaries and grain boundaries act as effective barrier against crack propagation. |
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| Keywords: | Duplex stainless steel Fatigue Crack nucleation Microstructure EBSD |
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