Surface integrity of Inconel 718 by hybrid selective laser melting and milling

D. Brown, C. Li, Z. Y. Liu, X. Y. Fang, Y. B. Guo

Research output: Contribution to journalArticle

16 Scopus citations

Abstract

While selective laser melting (SLM) offers design freedom of metal parts with much less material consumption, there exist several limitations, including high surface roughness, low-dimensional accuracy, and high tensile residual stresses. To make functional parts with high form accuracy and superior surface integrity, an as-SLM part needs finishing to remove the deposited surface material. The integration of machining and SLM creates a hybrid manufacturing route to overcome the inherited limitations of SLM. However, little study has been done to characterise surface integrity of an as-SLM part followed by machining (e.g. hybrid SLM-milling). In this paper, surface, integrity including surface roughness, microstructure, and microhardness, have been characterised for IN718 samples processed by the hybrid process. It has been found that microhardness varies with the scan direction and the use of coolant in the subsequent milling, and surface integrity can be significantly improved by the hybrid SLM-milling route.

Original languageEnglish (US)
Pages (from-to)26-31
Number of pages6
JournalVirtual and Physical Prototyping
Volume13
Issue number1
DOIs
StatePublished - Jan 2 2018
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Signal Processing
  • Modeling and Simulation
  • Computer Graphics and Computer-Aided Design
  • Industrial and Manufacturing Engineering

Keywords

  • Surface integrity
  • hybrid manufacturing
  • machining
  • selective laser melting

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