Room and High Temperature Sliding Wear Characteristics of Laser Surface Melted Stellite 6 and Mo-Alloyed Stellite 6 Hardfacings

Ali Abdul Munim Alhattab, Shaikh Asad Ali Dilawary, Amir Motallebzadeh, C. Fahir Arisoy, Huseyin Cimenoglu*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


In this work, a post treatment of laser surface melting (LSM) has been employed on Stellite 6 and 10 wt.% Mo-alloyed Stellite 6 hardfacings deposited by plasma transferred arc (PTA) process. LSM process refined the microstructures of both hardfacings, while favoring a network-like complex carbide dominated microstructure in the Mo-alloyed version. With reference to the PTA Stellite 6 hardfacing, LSM process led to an increment in surface hardness albeit a subsequent reduction of wear loss at room temperature, where abrasive wear mechanism was dominant. At 500 °C, oxidative wear contributed to the progress of wear by favoring CoO and Co3O4 type tribo-oxides on the contact surfaces of the PTA and LSM’ed hardfacings, respectively. However, Co3O4 type tribo-oxides exhibited poor mechanical stability, than CoO, which led to easier removal from the contact surface and aggravated the wear loss by abrasive wear mechanism. In this respect, LSM’ed hardfacings exhibited higher wear loss than PTA Stellite 6 hardfacing at 500 °C, unlike room temperature.

Original languageEnglish
Pages (from-to)302-311
Number of pages10
JournalJournal of Materials Engineering and Performance
Issue number1
Publication statusPublished - Jan 2021

Bibliographical note

Publisher Copyright:
© 2021, ASM International.


This work was made possible thanks to the funding granted by Istanbul Technical University, Turkey [Grant Number MDK-2017-41241]. Authors are also extremely grateful to Senmak Co., Turkey, for the provision of PTA facilities. Special thanks are due to Dr. Emre Tekoglu and Mr. Mertcan Kaba of Istanbul Technical University for SEM assist. Ministry of Higher Education and Scientific Research of Iraq is gratefully acknowledged for Ph.D. study grant of Ali Abdul Munim Alhattab. A part of this work was presented at 4th International Iron and Steel Symposium UDCS’19 during April 4-6, 2019, Karabuk University, Karabuk, Turkey.

FundersFunder number
Ali Abdul Munim Alhattab
Ministry of Higher Education and Scientific Research
Istanbul Teknik ÜniversitesiMDK-2017-41241


    • hardfacing
    • laser surface melting
    • oxidation
    • Stellite 6
    • wear


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