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

J. F. Liu; L. Li; Y. B. Guo

doi:10.1016/j.procir.2014.04.024

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

J. F. Liu, L. Li, Y. B. Guo

Research output: Contribution to journal › Conference article › peer-review

23 Scopus citations

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 Ni_50.8Ti _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 language	English (US)
Pages (from-to)	137-142
Number of pages	6
Journal	Procedia CIRP
Volume	13
DOIs	https://doi.org/10.1016/j.procir.2014.04.024
State	Published - 2014
Externally published	Yes
Event	2nd CIRP Conference on Surface Integrity, CSI 2014 - Nottingham, United Kingdom Duration: May 28 2014 → May 30 2014

All Science Journal Classification (ASJC) codes

Control and Systems Engineering
Industrial and Manufacturing Engineering

Keywords

Shape memory alloy
Surface integrity
W-EDM

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10.1016/j.procir.2014.04.024

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@article{deacbee683ed4494a852696c7e989e50,

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

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.",

keywords = "Shape memory alloy, Surface integrity, W-EDM",

author = "Liu, {J. F.} and L. Li and Guo, {Y. B.}",

note = "Funding Information: The work has been supported by NSF #1234696.; 2nd CIRP Conference on Surface Integrity, CSI 2014 ; Conference date: 28-05-2014 Through 30-05-2014",

year = "2014",

doi = "10.1016/j.procir.2014.04.024",

language = "English (US)",

volume = "13",

pages = "137--142",

journal = "Procedia CIRP",

issn = "2212-8271",

publisher = "Elsevier BV",

}

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, Y. B.

N1 - Funding Information: The work has been supported by NSF #1234696.

PY - 2014

Y1 - 2014

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.

KW - Shape memory alloy

KW - Surface integrity

KW - W-EDM

UR - http://www.scopus.com/inward/record.url?scp=84901817564&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84901817564&partnerID=8YFLogxK

U2 - 10.1016/j.procir.2014.04.024

DO - 10.1016/j.procir.2014.04.024

M3 - Conference article

AN - SCOPUS:84901817564

SN - 2212-8271

VL - 13

SP - 137

EP - 142

JO - Procedia CIRP

JF - Procedia CIRP

T2 - 2nd CIRP Conference on Surface Integrity, CSI 2014

Y2 - 28 May 2014 through 30 May 2014

ER -

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

Abstract

All Science Journal Classification (ASJC) codes

Keywords

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