K. Sanjeeviprakash, A. Rajesh Kannan, N. Siva Shanmugam
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Fatigue Life Assessment of Wire arc Additive Manufactured Duplex Stainless Steel From ER2209 Filler Wire
Duplex stainless steels (DSS) are known for their excellent strength and corrosion resistance in cyclic loading applications such as power plants and structural components, etc. This study examines the fatigue life of wire arc additive manufactured (WAAM) ER2209 DSS. The as-fabricated WAAM wall consists of fine and equiaxed dendrites with predominantly austenitic phase due to complex thermal cycles and filler wire chemistry. Tensile tests reveal anisotropy between build and deposit directions, with notable differences in yield strength, tensile strength, and ductility. Fatigue behavior along the build direction resembles austenitic stainless steel SS316, enduring up to 1.5 million cycles without failure below 40% of yield stress (188.7 MPa), but shows significant differences compared to wrought DSS2205. Post-fatigue EBSD analysis identifies crack initiation from persistent slip bands, propagating along austenite-ferrite grain boundaries. Fracture morphologies show smooth, widely spaced striations at low-stress amplitudes, transitioning to rough, closely spaced striations at higher stress amplitudes.
期刊介绍：
Fatigue & Fracture of Engineering Materials & Structures (FFEMS) encompasses the broad topic of structural integrity which is founded on the mechanics of fatigue and fracture, and is concerned with the reliability and effectiveness of various materials and structural components of any scale or geometry. The editors publish original contributions that will stimulate the intellectual innovation that generates elegant, effective and economic engineering designs. The journal is interdisciplinary and includes papers from scientists and engineers in the fields of materials science, mechanics, physics, chemistry, etc.
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