Experimental Investigation on Wear Behavior of Additively Manufactured Components of IN718 by DMLS Process
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TECHNICAL ARTICLE—PEER-REVIEWED
Experimental Investigation on Wear Behavior of Additively Manufactured Components of IN718 by DMLS Process Rohit Krishnan . Mahesh Naik . D. G. Thakur . V. Dillibabu
Submitted: 25 October 2019 / in revised form: 11 May 2020 ASM International 2020
Abstract Direct metal laser sintering (DMLS) is a promising technology having applications in diverse areas like aerospace, automotive and energy. This technique is capable of fabricating complex components from hard to machine materials like Inconel and titanium alloys with relative ease. Inconel 718 is a widely preferred material for high-end applications involving challenging environments such as elevated temperatures and pressures, wherein the wear behavior of the material is of utmost significance. So this study aimed to investigate the wear behavior of DMLS IN718 specimens and compare it with that of conventionally cast specimens manufactured by vacuum induction melting (VIM) process. The testing of the specimens was done using a pin-on-disk wear tester against two different disks; IN718 is made by VIM casting process and wrought En-31 under varying normal load and sliding velocity. Also, the DMLS IN718 specimens were built in two orientations, i.e., horizontal and angular. It was observed that the wear rate increased with an increase in load and sliding velocity. The coefficient of friction showed a decreasing trend while sliding against IN718 but exhibited a random behavior with En-31. The wear behavior of the DMLS and conventionally cast-made IN718 specimens was found to be in a similar range, and the built orientation in DMLS did not significantly impact the wear behavior. The subsequent R. Krishnan M. Naik D. G. Thakur (&) Department of Mechanical Engineering, DIAT (DU), Ministry of Defence, Pune, Maharashtra 411025, India e-mail: [email protected] M. Naik e-mail: [email protected] V. Dillibabu Gas Turbine Research Establishment (GTRE, DRDO), Ministry of Defence, Bengaluru 560093, India
scanning electron microscope images of the wear tracks revealed that the mechanism of wear was a combination of adhesive wear and delamination wear resulting from abrasive action. Keywords Wear
IN718 DMLS Additive manufacturing
Introduction Direct metal laser sintering (DMLS) is a revolutionary additive manufacturing technique which creates 3D parts by layered addition of material, thus rendering output from the input CAD design model [1]. Due to its unique building technique, DMLS has many advantages which include the ability to produce complex parts with less effort and time, reduction in material wastage, elimination of tool, reduction in lead time and ability to fabricate end-use parts with good accuracy and properties [2, 3]. Owing to these benefits, DMLS applications lie across a wide range of areas including aerospace, automotive, energy and so on [2, 4]. Today, a DMLS can process a variety of metals like steel, cobalt–chrome alloys, titanium alloys, nickel alloys and aluminum alloys [5]. Among these, DMLS of IN718
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