Session: 03-05 Metals: Dissimilar Materials

Paper Number: 94800

94800 - Characterization of Waam-Based Bimetallic Component Fabricated With Austenitic Stainless Steel and Inconel 625 

Additively manufactured bimetallic industrial components have the potential to replace traditionally-manufactured functionally graded components via the GMAW-based WAAM process. Inconel625 and austenitic stainless steel are two significantly used materials in bimetallic components for aerospace, power generation, and marine industries. In the present work, additive manufacturing of Inconel 625 and austenitic stainless steel bimetallic components have been conducted through robotic WAAM technology. The process parameters of each welding wire for deposition were selected through response surface analyses of single-wire feed depositions of the two wires. The microstructural characterization of the bimetallic structure was characterized using a stereomicroscope (SM), optical microscope (OM), and scanning electron microscope (SEM) equipped with energy-dispersive X-ray spectroscopy (EDS). X-ray fluorescence (XRF) elemental mapping was conducted thorough the interface to investigate the chemical composition variations at the interface. Microhardness tests along with the interfacial investigations were conducted to determine the microstructural features in the multilayer builds of the additively manufactured bimetallic component. The hardness results were taken from the base material to the top layer at 0.5 mm intervals. A heterogeneous hardness distribution values were obtained from bottom to top of the deposited bimetallic component. Additionally, a critical insight was obtained for the interfacial microstructure which provides a fundamental understanding of the wire arc additively manufactured bimetallic component with the Inconel 625 and ER-316L austenitic stainless steel welding wires.  

Presenting Author: Savas Dilibal Istanbul Gedik University

Presenting Author Biography: After graduation as a system engineer in 1995, he received his Master’s degree in materials design and manufacturing program in Mechanical Engineering from Istanbul Technical University. He received his Ph.D. in Materials Engineering from Yildiz Technical University. He has a strong background on SMAs such as processing-microstructure-mechanical property relationships, and thermo-mechanical response of shape memory alloys. After his Ph.D., he completed a postdoctoral fellowship at the University of Illinois at Urbana-Champaign (UIUC) in the Department of Mechanical Science and Engineering in 2010. During his postdoctoral fellowship at UIUC (USA), he focused on the mechanical behavior of shape memory alloys. He worked on a NASA funded project (NASA`s Subsonic Fixed Wing Program - Modeling and experimentation on shape memory alloys) between 2012-2014 as a Research Associate at the University of Akron, OH (USA). He also worked as an adjunct faculty in the Mechanical Engineering Department at the University of Akron, OH (USA). In 2015, he started working in the Engineering Faculty at Istanbul Gedik University. He studied on the additively manufactured polymer embedded NiTi SMA actuated robotic finger and pneumatically driven additively manufactured soft robotics actuators projects. In terms of additive manufacturing, he has been working on the fabrication of NiTi SMA through EBM based additive manufacturing and wire arc additive manufacturing with his MSc and Ph.D. students. He is currently working on the additively manufactured soft robotics actuator systems and the wire arc additive manufacturing (WAAM) system in Mechatronics Engineering Department. He is the head of mechatronics engineering department. He is also the director of Robot Technology Research and Application Center.

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