Effect of bond coat and preheat on the microstructure, hardness, and porosity of flame sprayed tungsten carbide coatings

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Abstract

Thermally sprayed coatings are used to improve the surface properties of tool steel materials. Bond coatings are commonly used as intermediate layers deposited on steel substrates (i.e. H13 tool steel) before the top coat is applied in order to enhance a number of critical performance criteria including adhesion of a barrier coating, limiting atomic migration of the base metal, and corrosion resistance. This paper presents the experimental results regarding the effect of nickel bond coat and preheats temperatures (i.e. 200°C, 300°C and 400°C) on microstructure, hardness, and porosity of tungsten carbide coatings sprayed by flame thermal coating. Micro-hardness, porosity and microstructure of tungsten carbide coatings are evaluated by using micro-hardness testing, optical microscopy, scanning electron microscopy, and X-ray diffraction. The results show that nickel bond coatings reduce the susceptibility of micro crack formation at the bonding area interfaces. The percentage of porosity level on the tungsten carbide coatings with nickel bond coat decreases from 5.36 % to 2.78% with the increase of preheat temperature of the steel substrate of H13 from 200°C to 400°C. The optimum hardness of tungsten carbide coatings is 1717 HVN in average resulted from the preheat temperature of 300°C.

Original languageEnglish
Title of host publicationGreen Process, Material, and Energy
Subtitle of host publicationA Sustainable Solution for Climate Change - Proceedings of the 3rd International Conference on Engineering, Technology, and Industrial Application, ICETIA 2016
EditorsHari Prasetyo, Wisnu Setiawan, Fajar Suryawan, Munajat Tri Nugroho, Tri Widayatno, Nurul Hidayati, Eko Setiawan
PublisherAmerican Institute of Physics Inc.
ISBN (Electronic)9780735415294
DOIs
Publication statusPublished - 15 Jun 2017
Event3rd International Conference on Engineering, Technology, and Industrial Application - Green Process, Material, and Energy: A Sustainable Solution for Climate Change, ICETIA 2016 - Surakarta, Indonesia
Duration: 7 Dec 20168 Dec 2016

Publication series

NameAIP Conference Proceedings
Volume1855
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Conference

Conference3rd International Conference on Engineering, Technology, and Industrial Application - Green Process, Material, and Energy: A Sustainable Solution for Climate Change, ICETIA 2016
Country/TerritoryIndonesia
CitySurakarta
Period7/12/168/12/16

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