Fatigue Life Assessment of Wire arc Additive Manufactured Duplex Stainless Steel From ER2209 Filler Wire

IF 3.2 2区材料科学 Q2 ENGINEERING, MECHANICAL

Fatigue & Fracture of Engineering Materials & Structures Pub Date : 2025-06-26 DOI:10.1111/ffe.70014

K. Sanjeeviprakash, A. Rajesh Kannan, N. Siva Shanmugam

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引用次数: 0

Abstract

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.

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ER2209焊丝电弧添加剂制备双相不锈钢疲劳寿命评价

双相不锈钢（DSS）以其优异的强度和耐腐蚀性而闻名于循环加载应用，如发电厂和结构部件等。本研究考察了焊丝电弧添加剂制造（WAAM） ER2209 DSS的疲劳寿命。由于复杂的热循环和填充线化学反应，制备的WAAM壁由细小的等轴枝晶组成，主要是奥氏体相。拉伸试验揭示了构建和沉积方向之间的各向异性，在屈服强度、抗拉强度和延性方面存在显著差异。沿着构建方向的疲劳行为类似于奥氏体不锈钢SS316，在低于40%屈服应力（188.7 MPa）的情况下，可以承受高达150万次的循环而不会失效，但与变形后的DSS2205相比有显著差异。疲劳后EBSD分析发现，裂纹起源于沿奥氏体-铁素体晶界扩展的持续滑移带。在低应力幅值下，裂缝形态表现为光滑、宽间距的条痕，在高应力幅值下，裂缝形态转变为粗糙、紧密间距的条痕。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Fatigue & Fracture of Engineering Materials & Structures 工程技术-材料科学：综合

CiteScore

6.30

自引率

18.90%

发文量

256

审稿时长

4 months

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.