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Effect of electron beam surface melting on the microstructure and wear behavior of Stellite 12 hardfacing

Ali Abdul Munim Alhattab (Istanbul Teknik Universitesi, Istanbul, Turkey)
Shaikh Asad Ali Dilawary (Istanbul Teknik Universitesi, Istanbul, Turkey)
Amir Motallebzadeh (Koc Universitesi – Rumelifeneri Kampusu, Istanbul, Turkey)
Cevat Fahir Arisoy (Istanbul Teknik Universitesi, Istanbul, Turkey)
Huseyin Cimenoglu (Department of Metallurgical and Materials Engineering, Istanbul Technical University, Istanbul, Turkey)

Industrial Lubrication and Tribology

ISSN: 0036-8792

Article publication date: 12 April 2019

Issue publication date: 22 August 2019




The purpose of this study is to investigate the effect of electron beam surface melting (EBSM) on the properties of Plasma Transfer Arc (PTA) deposited Stellite 12 hardfacing.


For this purpose, structural characterization and dry sliding wear tests have been conducted on the hardfacings at room temperature. The wear tracks formed on the surfaces of the hardfacings were examined by a stylus-type profilometer and a scanning electron microscope.


Refinement of the matrix and the carbides following EBSM process led to about 15 per cent increment in hardness as compared to PTA state. Despite an increase in the surface hardness, EBSM’ed hardfacing exhibited about 50 per cent lower sliding wear resistance than PTA hardfacing against alumina ball. According to the worn surface examinations, reduction in the wear resistance of Stellite 12 after EBSM process has been associated with the extensive refinement of the carbides which made them easier to be removed from the matrix during the sliding contact.


The authors of current study have applied EBSM to PTA deposited Stellite 12 hardfacing alloy to investigate if the surface structure and properties could be improved. More specifically the dry sliding wear performance of PTA and EBSM’ed hardfacings have been focused in the scope of this study. To the best of the authors’ knowledge, this approach, i.e. use of EBSM as a post deposition treatment of Stellite 12 hardfacings, has not been reported in open literature.



Research grant provided by Istanbul Technical University [Grant number MDK-2017-41241] is gratefully acknowledged. Authors of current study are very grateful for Dr Muhammad Afzal of Surface Engineering Solution, Pakistan for his assistance in EBSM process, Mert ALTAY of Istanbul Technical University for his assistance in SEM studies. Special thanks are due to Senmak Co. for provision of PTA facility. PhD study grant for “Ali Abdul Munim ALHATTAB”, by the Ministry of Higher Education and Scientific Research, Iraq, is also thankfully acknowledged.


Alhattab, A.A.M., Dilawary, S.A.A., Motallebzadeh, A., Arisoy, C.F. and Cimenoglu, H. (2019), "Effect of electron beam surface melting on the microstructure and wear behavior of Stellite 12 hardfacing", Industrial Lubrication and Tribology, Vol. 71 No. 5, pp. 636-641.



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