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Open AccessArticle

Superior Mechanical Behavior and Fretting Wear Resistance of 3D-Printed Inconel 625 Superalloy

by Yong Gao 1 and Mingzhuo Zhou 2,*
1
Wuhan Institute of Marine Electric Propulsion, Wuhan 430064, China
2
The State Key Laboratory of Digital Manufacturing Equipment and Technology, School of Mechanical Science and Engineering, Huazhong University of Science and Technology (HUST), Wuhan 430074, China
*
Author to whom correspondence should be addressed.
Appl. Sci. 2018, 8(12), 2439; https://doi.org/10.3390/app8122439
Received: 17 October 2018 / Revised: 16 November 2018 / Accepted: 16 November 2018 / Published: 1 December 2018
(This article belongs to the Special Issue 3D Printing of Metals)
Additive manufacturing (AM) nickel-based superalloys have been demonstrated to equate or exceed mechanical properties of cast and wrought counterparts but their tribological potentials have not been fully realized. This study investigates fretting wear behaviors of Inconel 625 against the 42 CrMo4 stainless steel under flat-on-flat contacts. Inconel 625 is prepared by additive manufacturing (AM) using the electron beam selective melting. Results show that it has a high hardness (335 HV), superior tensile strength (952 MPa) and yield strength (793 MPa). Tribological tests indicate that the AM-Inconel 625 can suppress wear of the surface within a depth of only ~2.4 μm at a contact load of 106 N after 2 × 104 cycles. The excellent wear resistance is attributed to the improved strength and the formation of continuous tribo-layers containing a mixture of Fe2O3, Fe3O4, Cr2O3 and Mn2O3. View Full-Text
Keywords: nickel; fretting; hardness; wear mechanisms nickel; fretting; hardness; wear mechanisms
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Gao, Y.; Zhou, M. Superior Mechanical Behavior and Fretting Wear Resistance of 3D-Printed Inconel 625 Superalloy. Appl. Sci. 2018, 8, 2439.

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