PSI - Issue 42

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ScienceDirect

Procedia Structural Integrity 42 (2022) 1017–1024 Structural Integrity Procedia 00 (2019) 000–000 Structural Integrity Procedia 0 ( 0 9) 000–000

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© 2022 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 23 European Conference on Fracture – ECF23 Abstract Selective laser melting (SLM) processed Inconel 718 has promising use in aerospace and power generation industry due to its better mechanical properties and excellent corrosive resistance at elevated temperatures of up to 600-800°C. Parts manufactured using additive manufacturing (AM) techniques come with lots of defects such as porosity, lack of fusion etc, which directly control their mechanical properties. So, it is essential to examine the microstructure and mechanical behaviour of additively manufactured component. In this paper, IN718 alloy specimens were manufactured using SLM process. Tensile and fatigue properties were examined on as-built and heat-treated specimens. It was observed that the heat-treated samples were having higher tensile and yield strength along with the better fatigue property than the as-built samples. Fracture surface zones of fatigue tested specimens were analysed using scanning electron microscopy and a finite element model was established to simulate the SLM process. 2020 The Authors. Published by Elsevier B.V. T is is an open access article under the CC BY- C-ND license (http: // cr ativec mmons.org / licenses / by-nc-nd / 4.0 / ) r ie unde responsibility of 23 European Conference on F acture – ECF23 . Keywords: Additive manufacturing; Fatigue; Finite element analysis; Inconel 718; Damage 23 European Conference on Fracture – ECF23 Study on fatigue damage in additively manufactured IN718 alloy Aditya Pandey a , Vidit Gaur a, ∗ a Department of Mechanical & Industrial Engineering, Indian Institute of Technology Roorkee, Uttarakhand – 247 667, India Abstract Selective laser melting (SLM) processed Inconel 718 has promising use in aerospace and power generation industry due to its better mechanical properties and excellent corrosive resistance at elevated temperatures of up to 600-800°C. Parts manufactured using additive manufacturing (AM) techniques come with lots of defects such as porosity, lack of fusion etc, which directly control their mechanical properties. So, it is essential to examine the microstructure and mechanical behaviour of additively manufactured component. In this paper, IN718 alloy specimens were manufactured using SLM process. Tensile and fatigue properties were examined on as-built and heat-treated specimens. It was observed that the heat-treated samples were having higher tensile and yield strength along with the better fatigue property than the as-built samples. Fracture surface zones of fatigue tested specimens were analysed using scanning electron microscopy and a finite element model was established to simulate the SLM process. © 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http: // creativecommons.org / licenses / by-nc-nd / 4.0 / ) Peer-review under responsibility of 23 European Conference on Fracture – ECF23 . Keywords: Additive manufacturing; Fatigue; Finite element analysis; Inconel 718; Damage 23 European Conference on Fracture – ECF23 Study on fatigue damage in additively manufactured IN718 alloy Aditya Pandey a , Vidit Gaur a, ∗ a Department of Mechanical & Industrial Engineering, Indian Institute of Technology Roorkee, Uttarakhand – 247 667, India Nickel-iron based super alloy IN718 widely used in the aerospace and power plant sectors due to its ability to preserve microstructure and mechanical stability at higher temperatures up to 650°C (Zhao et al. (2020)). Additive manufacturing (AM) is a process to build the three-dimensional component in layer by layer process. SLM is one of the AM processes that enables us to produce a very complex and near net shaped component. Laser powder interaction and rapid heating, cooling cycle induces high thermal gradient, which may result in distortion and residual stresses in final build part (Frazier et al. (2014)). The uncertainties exist in the mechanical properties of the SLM build parts due to anisotropy and heterogeneity present in them and thus not suitable for cyclic load applications (Wilson-Heid et al. (2017)). Additionally, the laser powder interactions and fusion of powder during the SLM process having a large number of tracks and deposition layers during printing, results in to the defects such as porosity, un-melted powder particles etc. It is well known that these defects can significantly alter the behaviour of materials, particularly the fatigue performance. The flaws could be sites for fatigue crack initiation and can have a significant impact on fatigue Nickel-iron based super alloy IN718 widely used in the aerospace and power plant sectors due to its ability to preserve microstructure and mechanical stability at higher temperatures up to 650°C (Zhao et al. (2020)). Additive manufacturing (AM) is a process to build the three-dimensional component in layer by layer process. SLM is one of the AM processes that enables us to produce a very complex and near net shaped component. Laser powder interaction and rapid heating, cooling cycle induces high thermal gradient, which may result in distortion and residual stresses in final build part (Frazier et al. (2014)). The uncertainties exist in the mechanical properties of the SLM build parts due to anisotropy and heterogeneity present in them and thus not suitable for cyclic load applications (Wilson-Heid et al. (2017)). Additionally, the laser powder interactions and fusion of powder during the SLM process having a large number of tracks and deposition layers during printing, results in to the defects such as porosity, un-melted powder particles etc. It is well known that these defects can significantly alter the behaviour of materials, particularly the fatigue performance. The flaws could be sites for fatigue crack initiation and can have a significant impact on fatigue 1. Introduction 1. Introduction

∗ Corresponding author. Tel.: Tel.: + 91-1332-284909. E-mail address: vidit.gaur@me.iitr.ac.in ∗ Corresponding author. Tel.: Tel.: + 91-1332-284909. E-mail address: vidit.gaur@me.iitr.ac.in

2452-3216 © 2022 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 23 European Conference on Fracture – ECF23 10.1016/j.prostr.2022.12.128 2210-7843 © 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http: // creativecommons.org / licenses / by-nc-nd / 4.0 / ) Peer-review under responsibility of 23 European Conference on Fracture – ECF23 . 2210-7843 © 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http: // creativecommons.org / licenses / by-nc-nd / 4.0 / ) Peer-review under responsibility of 23 European Conference on Fracture – ECF23 .