Pulsed laser machining of high-performance engineering and biomedical alloys

Asma Perveen, Adrian H.A. Lutey, Luca Romoli, Annamaria Cucinotta, Stefano Selleri

Research output: Contribution to journalArticle

Abstract

The exceptional mechanical and thermal properties of high-performance engineering and biomedical alloys lead to difficulties in machining with conventional processes. This work explores nanosecond pulsed laser machining as a flexible alternative to overcome manufacturing-related limitations associated with Ni Hastelloy, Ti-6Al-4V titanium alloy and Stellite 6K. An extensive experimental campaign was performed with a 1064 nm nanosecond pulsed fibre laser, quantifying the ablation threshold, penetration depth and material removal rate as functions of average laser power (2 to 20 W), repetition rate (20 to 80 kHz), scanning velocity (100 to 2,000 mm/s) and number of laser passes (1 to 20). Optimum conditions for machining were achieved for all alloys with 20 W average power, 20 kHz repetition rate and 1,000 mm/s scanning velocity due to strong ejection of the liquid phase with high pulse fluence (71 J/cm2), good process stability and material removal rates in the range 0.08 to 0.17 mm3/s.

Original languageEnglish
Pages (from-to)137-152
Number of pages16
JournalInternational Journal of Machining and Machinability of Materials
Volume22
Issue number2
DOIs
Publication statusPublished - Jan 1 2020

Keywords

  • Ablation threshold
  • Heat accumulation
  • Machining quality
  • Nanosecond ablation
  • Ni Hastelloy
  • Non-conventional machining
  • Penetration depth
  • Pulsed laser machining
  • Removal rate
  • Stellite 6K
  • Ti-6Al-4V

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Industrial and Manufacturing Engineering

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