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Materials 2017, 10(4), 333;

Manufacturing Feasibility and Forming Properties of Cu-4Sn in Selective Laser Melting

State Key Laboratory on Mechanical Transmission, Chongqing University, Chongqing 400044, China
College of Engineering, Mathematics and Physical Sciences, University of Exeter, North Park Road, Exeter EX4 4QF, UK
Author to whom correspondence should be addressed.
Academic Editor: Guillermo Requena
Received: 27 February 2017 / Revised: 15 March 2017 / Accepted: 15 March 2017 / Published: 24 March 2017
(This article belongs to the Special Issue Metals for Additive Manufacturing)
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Copper alloys, combined with selective laser melting (SLM) technology, have attracted increasing attention in aerospace engineering, automobile, and medical fields. However, there are some difficulties in SLM forming owing to low laser absorption and excellent thermal conductivity. It is, therefore, necessary to explore a copper alloy in SLM. In this research, manufacturing feasibility and forming properties of Cu-4Sn in SLM were investigated through a systematic experimental approach. Single-track experiments were used to narrow down processing parameter windows. A Greco-Latin square design with orthogonal parameter arrays was employed to control forming qualities of specimens. Analysis of variance was applied to establish statistical relationships, which described the effects of different processing parameters (i.e., laser power, scanning speed, and hatch space) on relative density (RD) and Vickers hardness of specimens. It was found that Cu-4Sn specimens were successfully manufactured by SLM for the first time and both its RD and Vickers hardness were mainly determined by the laser power. The maximum value of RD exceeded 93% theoretical density and the maximum value of Vickers hardness reached 118 HV 0.3/5. The best tensile strength of 316–320 MPa is inferior to that of pressure-processed Cu-4Sn and can be improved further by reducing defects. View Full-Text
Keywords: selective laser melting; additive manufacturing; copper alloy; relative density; Vickers hardness selective laser melting; additive manufacturing; copper alloy; relative density; Vickers hardness

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Mao, Z.; Zhang, D.Z.; Wei, P.; Zhang, K. Manufacturing Feasibility and Forming Properties of Cu-4Sn in Selective Laser Melting. Materials 2017, 10, 333.

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