Microstructural evolvement and formation of selective laser melting W–Ni–Cu composite powder

  • Danqing Zhang
  • Qizhou Cai
  • Jinhui Liu
  • Jian He
  • Ruidi Li
ORIGINAL ARTICLE

Abstract

W–Ni–Cu alloy (90 wt% W, 7.5 wt% Ni, and 2.5 wt% Cu) parts were successfully fabricated via selective laser melting method. Phases, microstructure, compositions, and laser forming parameters of laser melted samples were investigated. It was found that the W–Ni–Cu powder system was based on the mechanism of liquid solidification. This process was realized through full melting of W, Ni, and Cu particles under high laser energy input. However, using relatively lower energy input, particle bonding was realized through liquid phase sintering with complete melting of Ni–Cu acting as binder and nonmelting of W acting as structure. Due to the Ni–Cu solid solution phase that appeared in a wide range from 1,084 to 1,455 °C, a coherent matrix interface can be observed after solidification. The microhardness of laser-fabricated specimens varied with different powder layer thicknesses, resulting from the laser-treated condition and ability of trapped air in the loose powder bed to escape. The metallurgical mechanisms were also addressed.

Keywords

Selective laser melting W–Ni–Cu alloy Process window Microstructure 

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Copyright information

© Springer-Verlag London 2012

Authors and Affiliations

  • Danqing Zhang
    • 1
  • Qizhou Cai
    • 2
  • Jinhui Liu
    • 3
  • Jian He
    • 2
  • Ruidi Li
    • 2
  1. 1.School of Mechanical and Aerospace EngineeringNanyang Technological UniversitySingaporeSingapore
  2. 2.State Key Laboratory of Material Processing and Die and Mould TechnologyHuazhong University of Science and TechnologyWuhanPeople’s Republic of China
  3. 3.Heilongjiang Institute of Science and TechnologyHarbinPeople’s Republic of China

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