Article: Micro-WEDM of Ni55.8Ti shape memory superalloy: experimental investigation and optimisation Journal: International Journal of Mechatronics and Manufacturing Systems (IJMMS) 2021 Vol.14 No.1 pp.18 - 38 Abstract: Nickel-titanium superalloy has gained significant acceptance for engineering applications as orthotropic implants, orthodontic devices, automatic actuators, etc. Considering the unique properties of these alloys, such as high hardness, toughness, strain hardening, and development of strain-induced martensite, micro-wire electro-discharge machining (μ-WEDM) process has been accepted as one of the main options for cutting intricate shapes of these alloys in micro-scale. This paper presents the results of a comprehensive study to address the material removal rate (MRR) and surface integrity of Ni55.8Ti shape memory superalloy (SMA) in the μ-WEDM process. The effects of discharge current, pulse on-time, pulse off-time, and servo voltage on the performance of this process, including MRR, white layer thickness, surface roughness, and micro-hardness of the machined surface, were investigated by multi-regression analysis using response surface methodology (RSM). The optimisation of input parameters based on the gradient and the swarm optimisation algorithms were also conducted to maximise the MRR and minimise the white layer thickness, surface roughness, and micro-hardness of the machined samples. Inderscience Publishers - linking academia, business and industry through research

Title: Micro-WEDM of Ni55.8Ti shape memory superalloy: experimental investigation and optimisation

Authors: Hassan Ali M. Meshri; Samet Akar; Mirsadegh Seyedzavvar; Sadik Engin Kiliç

Addresses: Department of Manufacturing Engineering, Atilim University, Incek, 06836, Ankara, Turkey ' Department of Mechanical Engineering, Çankaya University, 06790, Ankara, Turkey ' Faculty of Engineering, Adana Alparslan Turkeş University of Science and Technology, 01250, Adana, Turkey ' Department of Manufacturing Engineering, Atilim University, Incek, 06836, Ankara, Turkey

Abstract: Nickel-titanium superalloy has gained significant acceptance for engineering applications as orthotropic implants, orthodontic devices, automatic actuators, etc. Considering the unique properties of these alloys, such as high hardness, toughness, strain hardening, and development of strain-induced martensite, micro-wire electro-discharge machining (μ-WEDM) process has been accepted as one of the main options for cutting intricate shapes of these alloys in micro-scale. This paper presents the results of a comprehensive study to address the material removal rate (MRR) and surface integrity of Ni55.8Ti shape memory superalloy (SMA) in the μ-WEDM process. The effects of discharge current, pulse on-time, pulse off-time, and servo voltage on the performance of this process, including MRR, white layer thickness, surface roughness, and micro-hardness of the machined surface, were investigated by multi-regression analysis using response surface methodology (RSM). The optimisation of input parameters based on the gradient and the swarm optimisation algorithms were also conducted to maximise the MRR and minimise the white layer thickness, surface roughness, and micro-hardness of the machined samples.

Keywords: Ni_55.8Ti; μ-WEDM; Kerf; white layer; surface roughness; microhardness.

DOI: 10.1504/IJMMS.2021.115461

International Journal of Mechatronics and Manufacturing Systems, 2021 Vol.14 No.1, pp.18 - 38

Received: 22 Jul 2020
Accepted: 10 Oct 2020
Published online: 03 Jun 2021 *

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Title: Micro-WEDM of Ni55.8Ti shape memory superalloy: experimental investigation and optimisation

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