+Advanced Search
Effect of Heat Treatment on microstructure and mechanical Properties of Inconel 718 alloy fabricated by selective laser melting
Author:
Affiliation:

1.National Engineering Research of Net-Sharp Forming for Metallic Material,South China University of Technology;2.Guangzhou Zoltrix HIP Material Co Ltd,Guangzhou

Clc Number:

Fund Project:

  • Article
  • |
  • Figures
  • |
  • Metrics
  • |
  • Reference
  • |
  • Related
  • |
  • Cited by
  • |
  • Materials
  • |
  • Comments
    Abstract:

    This paper studies for the effect of solution-aging (SA), homogenization + solution aging (H+SA), Hot isostatic pressing + solution-aging (HIP + SA) three different heat treatments on the microstructure and mechanical properties of selective laser melting (SLM) formed Inconel 718 alloy. The as-built Inconel 718 has a large number of dendritic structures, and there are many brittle Laves phase precipitating among the interdendritic region. The δ phase was prone to precipitate when treated by proper homogenization, but the material can not be strengthened without γ"and γ " phases. Hot isostatic pressing(1080 ℃×1480 bar/2 h) can considerably removed Laves phase and micro pores of the as-fabricated samples, and combine with the solution aging treatment subsequently, it’s conductive to refine the grain size of the as-built samples, flat the grain boundaries, and promote the precipitation of γ "、γ " phase, so HIP+SA treatment significantly increases the strength of Inconel 718 alloy, the mechanical properties of Inconel 718 alloy reached their optimum combination at UTS=1361 MPa, 0.2% YS=1191 Mpa, and HV0.2 =490, and the elongation after breaking is 13.30%.

    Reference
    Related
    Cited by
Get Citation

[Zhang Rong, Liu Zhongqiang, Huang Jiahao, Zhu Quanli, Xiao Zhiyu. Effect of Heat Treatment on microstructure and mechanical Properties of Inconel 718 alloy fabricated by selective laser melting[J]. Rare Metal Materials and Engineering,2021,50(1):255~262.]
DOI:10.12442/j. issn.1002-185X.20200009

Copy
Article Metrics
  • Abstract:
  • PDF:
  • HTML:
  • Cited by:
History
  • Received:January 06,2020
  • Revised:February 17,2020
  • Adopted:February 21,2020
  • Online: February 05,2021
  • Published: