Effects of wire-electro discharge machining process on surface integrity of WC-10Co alloy

Sireli E., Orhon N., Kartal Şireli G.

INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS, vol.64, pp.190-199, 2017 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 64
  • Publication Date: 2017
  • Doi Number: 10.1016/j.ijrmhm.2016.12.001
  • Journal Name: INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.190-199
  • Keywords: w-EDM, Surface integrity, Hard metal, TIN morphology, WC-CO, MECHANICAL-PROPERTIES, WEAR RESPONSE, MICROSTRUCTURE, TIN, PARAMETERS, BEHAVIOR, FRACTURE, IMPROVEMENT, FRICTION
  • Istanbul Technical University Affiliated: Yes

Abstract

In this study, the effects of heat affected zone generated by wire electro discharge machining (w-EDM) process on the surface integrity of a K15 grade hard metal before and after TiN coating application via chemical vapour deposition (CVD) was investigated. It was observed that applying dry blasting (DB) on w-EDM'ed surfaces is a very efficient way to remove heat affected zone, namely recast layer. TiN layers deposited on w-EDM'ed surfaces showed a great diversity in their morphologies depending on the w-EDM process parameters and exhibited irregularities whereas the ones coated on dry blasted (DB'ed) surfaces constituted much finer mixture of nodular, star shaped and lenticular crystals. Adhesion of TiN layers on the DB'ed hard metal samples was better compared to the ones deposited directly on w-EDM'ed samples with a thick heat affected zone on their surfaces. Friction and wear properties of the TiN layer formed on DB'ed surface against alumina ball were also superior which were also in good agreement with its higher adhesion strength and distinctive morphology. (C) 2016 Elsevier Ltd. All rights reserved.