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The Relationship of Fracture Mechanism between High Temperature Tensile Mechanical Properties and Particle Erosion Resistance of Selective Laser Melting Ti-6Al-4V Alloy

Department of Materials Science and Engineering, National Cheng Kung University, Tainan 701, Taiwan
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Metals 2019, 9(5), 501; https://doi.org/10.3390/met9050501
Received: 22 March 2019 / Revised: 8 April 2019 / Accepted: 26 April 2019 / Published: 29 April 2019
(This article belongs to the Special Issue Additive Manufacturing of Metals)
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Abstract

In this study, selective laser melting (SLM) Ti-6Al-4V is subjected to heat treatment for 4 h at 400 °C, 600 °C, and 800 °C, followed by air cooling. After heat treatment at 400 °C and 600 °C, the ductility was lower (strength increased). This was could be for two reasons: (1) high temperature tensile properties, and (2) particle erosion wear induced phase transformation. Finally, the particle erosion rates of as-SLM Ti-6Al-4V and heat treatment for 4 h at 800 °C (labeled 800-AC) were investigated and compared; the lamellar α + β phases in 800-AC are difficult to destroy with erosion particles, resulting in the erosion resistance of 800-AC being higher than that of the martensitic α’ needles in the as-SLM Ti-6Al-4V at all impact angles (even the hardness of the 800-AC specimen was lower). The as-SLM Ti-6Al-4V alloy needs heat treatment to have better wear resistance. View Full-Text
Keywords: selective laser melting (SLM); Ti alloy; high temperature tensile; erosion; wear selective laser melting (SLM); Ti alloy; high temperature tensile; erosion; wear
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Zhao, J.-R.; Hung, F.-Y.; Lui, T.-S.; Wu, Y.-L. The Relationship of Fracture Mechanism between High Temperature Tensile Mechanical Properties and Particle Erosion Resistance of Selective Laser Melting Ti-6Al-4V Alloy. Metals 2019, 9, 501.

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