Investigation of recast and crack formation in laser trepanning drilling of CMSX-4 angled holes

  • Nicolau Iralal Morar
  • Rajkumar Roy
  • Jörn Mehnen
  • Sundar Marithumu
  • Simon Gray
  • Tracey Roberts
  • John Nicholls
Open Access
ORIGINAL ARTICLE

Abstract

This paper presents an experimental investigation on the influences of laser trepanning drilling process parameters on the recast layer thickness and surface crack formation in CMSX-4 nickel-based superalloy angled holes. The effects of peak power, pulse frequency and the trepanning speed as input parameters were investigated in details by varying the laser drilling conditions using Taguchi orthogonal array-based design of experiment approach. Analysis of variance identifies the significant parameters affecting the output responses. It is found that the output responses are affected mainly by the peak power and trepanning speed. The experimental results reveal that the recast layer thickness increases with the increase of peak power and trepanning speed whereas the crack number density decreases with the increase of peak power only. Pulse frequency has no significant effect on both output responses within the range of values investigated. The knowledge gained in this parametric study could be used to improve the metallurgical characteristics of laser-drilled nickel-based acute angled holes.

Keywords

Laser trepanning drilling CMSX-4 Recast layer Surface cracks 

Notes

Acknowledgements

The authors are thankful to the Engineering and Physical Science Research Council for financial support of the research work (grant number EP/I033246/1) and Rolls-Royce Plc for the technical support and useful discussions. The laser drilling facilities provided by Manufacturing Technology Centre (MTC), Ansty, are gratefully acknowledged.

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Copyright information

© The Author(s) 2018

Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

Authors and Affiliations

  • Nicolau Iralal Morar
    • 1
  • Rajkumar Roy
    • 1
  • Jörn Mehnen
    • 2
  • Sundar Marithumu
    • 3
  • Simon Gray
    • 1
  • Tracey Roberts
    • 1
  • John Nicholls
    • 1
  1. 1.Department of Manufacturing and MaterialsCranfield UniversityCranfieldUK
  2. 2.Department of Design, Manufacture and Engineering ManagementUniversity of StrathclydeGlasgowUK
  3. 3.Manufacturing Technology Centre (MTC), Ansty Business ParkWarwickshireUK

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