Surface integrity evolution from main cut to finish trim cut in W-EDM of shape memory alloy

J. F. Liu, L. Li, Yuebin Guo

Research output: Contribution to journalConference article

14 Citations (Scopus)

Abstract

Shape memory alloys such as Nitinol are widely used in medical, aerospace, actuator, and machine tool industries. However, Nitinol is a very difficult-to-machine material due to the superelasticity, high ductility, and severe strain-hardening. This study explores the process capability of W-EDM (DI-water based dielectric) in machining Nitinol Ni50.8Ti 49.2 by one main cut (MC) followed by four trim cuts (TC). Experimental results show that the 6-sigma distributions of Ra are very different between MC and finish TC. Thick white layers (2-8 μm) with microcracks in MC and very thin white layers (0-2 μm) free of those defects in finish TC can be observed. However, microcracks would not propagate into the heat affected zone (HAZ) below the white layer. The white layer by TC is about 50% higher than that by MC. In addition, Ni is the dominant element for the measured microhardness.

Original languageEnglish (US)
Pages (from-to)137-142
Number of pages6
JournalProcedia CIRP
Volume13
DOIs
StatePublished - Jan 1 2014
Externally publishedYes
Event2nd CIRP Conference on Surface Integrity, CSI 2014 - Nottingham, United Kingdom
Duration: May 28 2014May 30 2014

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Microcracks
Shape memory effect
Heat affected zone
Strain hardening
Machine tools
Microhardness
Ductility
Machining
Actuators
Defects
Water
Industry

All Science Journal Classification (ASJC) codes

  • Control and Systems Engineering
  • Industrial and Manufacturing Engineering

Cite this

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abstract = "Shape memory alloys such as Nitinol are widely used in medical, aerospace, actuator, and machine tool industries. However, Nitinol is a very difficult-to-machine material due to the superelasticity, high ductility, and severe strain-hardening. This study explores the process capability of W-EDM (DI-water based dielectric) in machining Nitinol Ni50.8Ti 49.2 by one main cut (MC) followed by four trim cuts (TC). Experimental results show that the 6-sigma distributions of Ra are very different between MC and finish TC. Thick white layers (2-8 μm) with microcracks in MC and very thin white layers (0-2 μm) free of those defects in finish TC can be observed. However, microcracks would not propagate into the heat affected zone (HAZ) below the white layer. The white layer by TC is about 50{\%} higher than that by MC. In addition, Ni is the dominant element for the measured microhardness.",
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Surface integrity evolution from main cut to finish trim cut in W-EDM of shape memory alloy. / Liu, J. F.; Li, L.; Guo, Yuebin.

In: Procedia CIRP, Vol. 13, 01.01.2014, p. 137-142.

Research output: Contribution to journalConference article

TY - JOUR

T1 - Surface integrity evolution from main cut to finish trim cut in W-EDM of shape memory alloy

AU - Liu, J. F.

AU - Li, L.

AU - Guo, Yuebin

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N2 - Shape memory alloys such as Nitinol are widely used in medical, aerospace, actuator, and machine tool industries. However, Nitinol is a very difficult-to-machine material due to the superelasticity, high ductility, and severe strain-hardening. This study explores the process capability of W-EDM (DI-water based dielectric) in machining Nitinol Ni50.8Ti 49.2 by one main cut (MC) followed by four trim cuts (TC). Experimental results show that the 6-sigma distributions of Ra are very different between MC and finish TC. Thick white layers (2-8 μm) with microcracks in MC and very thin white layers (0-2 μm) free of those defects in finish TC can be observed. However, microcracks would not propagate into the heat affected zone (HAZ) below the white layer. The white layer by TC is about 50% higher than that by MC. In addition, Ni is the dominant element for the measured microhardness.

AB - Shape memory alloys such as Nitinol are widely used in medical, aerospace, actuator, and machine tool industries. However, Nitinol is a very difficult-to-machine material due to the superelasticity, high ductility, and severe strain-hardening. This study explores the process capability of W-EDM (DI-water based dielectric) in machining Nitinol Ni50.8Ti 49.2 by one main cut (MC) followed by four trim cuts (TC). Experimental results show that the 6-sigma distributions of Ra are very different between MC and finish TC. Thick white layers (2-8 μm) with microcracks in MC and very thin white layers (0-2 μm) free of those defects in finish TC can be observed. However, microcracks would not propagate into the heat affected zone (HAZ) below the white layer. The white layer by TC is about 50% higher than that by MC. In addition, Ni is the dominant element for the measured microhardness.

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