Progressive tool-wear in machining of room-temperature austenitic NiTi alloys: The influence of cooling/lubricating, melting, and heat treatment conditions

Y. Kaynak, S. W. Robertson, H. E. Karaca, I. S. Jawahir

Research output: Contribution to journalArticlepeer-review

56 Scopus citations

Abstract

This study investigates the effects of fabrication (vacuum arc remelting (VAR) melted vs. vacuum induction melting combined with VAR (VIM + VAR)), processing (hot rolled + fully annealed vs. cold worked + superelastic anneal) and machining conditions (dry, cryogenic, and minimum quantity lubrication (MQL)) of NiTi alloys on their progressive tool-wear behavior. Experimental findings reveal that cryogenic machining substantially improves the performance of cutting tools by reducing the progressive tool-wear in machining of the room-temperature austenitic NiTi alloys. Therefore, cryogenic machining could result in improved productivity and reduced manufacturing costs compared to dry and MQL machining. Experimental evidence suggests that cold working did not alter the progressive tool-wear substantially; however, the presence of carbide inclusions increased the progressive tool-wear in machining NiTi. Surface quality of machined samples under cryogenic machining presents promising improvement upon short-duration machining compared to dry and MQL machining, but all three techniques resulted in comparable quality after 4 min of machining.

Original languageEnglish
Pages (from-to)95-104
Number of pages10
JournalJournal of Materials Processing Technology
Volume215
DOIs
StatePublished - Jan 2015

Bibliographical note

Funding Information:
Authors would like to thank to Nitinol Devices & Components, Inc. for providing work materials for this study. Support from the NASA EPSCoR Program under Grant no. NNX11AQ31A is greatly acknowledged.

Keywords

  • Cooling/lubricating
  • Heat treatment
  • Machining
  • Melting
  • Room-temperature austenitic NiTi alloys
  • Tool-wear

ASJC Scopus subject areas

  • Ceramics and Composites
  • Computer Science Applications
  • Metals and Alloys
  • Industrial and Manufacturing Engineering

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