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Characteristics Of Cu-Cr Alloys Fabricated Using Selective Laser Melting

  • : Sohei Uchida1, Takahiro Kimura1, Takayuki Nakamoto1, Tomoatsu Ozaki1, Takao Miki1, Mamoru Takemura1, Yohei Oka2, Ryusuke Tsubota2
  • : 1Osaka Research Institute of Industrial Science and Technology, 2Daihen Corporation
  • : PDF Download
  • : 2018

Abstract

The microstructures and the electrical and mechanical properties of Cu-Cr alloys fabricated using selective laser melting (SLM) were investigated. The effects of annealing on the properties of the SLM specimens were also investigated. By optimizing the laser scanning parameters for each Cu-1.3 mass%Cr (1.3Cr) and Cu-2.5 mass%Cr (2.5Cr) alloy powder almost fully dense SLM specimens having more than 99.7% relative density could be obtained. In the 1.3Cr SLM specimen the electrical conductivity significantly increased from 20%IACS in the as-fabricated state to 91%IACS after annealing at 600 °C. In the case of the 2.5Cr SLM specimen annealing at 450 °C increased the ultimate tensile strength from 449 MPa in the as-fabricated state to 777 MPa which was much higher than that of conventional wrought materials. Microstructural analyses suggested that the increases in both the electrical conductivity and tensile strength were ascribed to the fine precipitation of chromium by annealing.

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