1. Modification of M2 hardfacing: Effect of molybdenum alloying and laser surface melting on microstructure and wear performance
- Author
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Muhammad Afzal, Rostislav Medlín, Šárka Houdková, Stanislav Haviar, Shaikh Asad Ali Dilawary, František Lukáč, Amir Motallebzadeh, and Huseyin Cimenoglu
- Subjects
Laser Surface Melting ,Materials science ,Laserové přetavené povrchu ,Oxide ,Hardfacing ,chemistry.chemical_element ,02 engineering and technology ,M2 high-speed steel ,Mo ,Carbide ,chemistry.chemical_compound ,Wear ,0203 mechanical engineering ,M2 ocel ,Materials Chemistry ,Opotřebení ,Deposition (law) ,Molybdenum ,Metallurgy ,Návar ,Surfaces and Interfaces ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,Microstructure ,Tribo-oxide ,Surfaces, Coatings and Films ,Tribo-oxidace ,020303 mechanical engineering & transports ,chemistry ,Mechanics of Materials ,Volume fraction ,0210 nano-technology ,Layer (electronics) - Abstract
Vliv legování (10 wt% Mo) a následného zpracování povrchu (laserové přetavení povrchu) na vlastnosti a chování byl hodnocen u PTA návaru oceli M2. Vlivem legování Mo došlo ke změně charaketru a povahy jak matrice, tak karbidů v povlaku M2. Naopak, laserové zpracování vedlo ke zjemnění struktury a potalčení precipitace karbidických částic. Navzdory zvýšení povrchové trvrdosti vykazoval povlak po laserovém zpracování pokles odolnosti proti opotřebení. Naopak, návar legovaný Mo zlepšil odolnost proti opotřebení, ačkoli jeho tvrdost poklesla. Důvodem byla tvorba oxidického tribofilmu typu Magneli v Mo legované oceli. The influence of alloying (10 wt% Molybdenum) and post deposition treatment (Laser Surface Melting) on the structural characteristics and wear performance of Plasma Transfer Arc deposited M2 hardfacings have been investigated. The nature of matrix and carbides of M2 hardfacing had changed upon Molybdenum addition while the Laser Surface Melting caused structural refinement and a decrease in carbide volume fraction. Despite an increase in hardness, Laser Surface Melting has resulted in reduction in sliding wear resistance against alumina counterface, while the Molybdenum enhanced the wear resistance even with decrease in hardness. This counter intuitive behaviour is attributed to Magnelli oxide containing tribo-oxide layer formation on the worn surface of Molybdenum alloyed hardfacings.
- Published
- 2018
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