Analysis and characterisation of WC-10Co and AISI 4340 steel bimetal composite produced by powder–solid diffusion bonding
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Cermet and steel material bonding is a challenging task, due to their large difference of physical properties, e.g. coefficient of thermal expansion. In this study, a hot compaction diffusion bonding method was employed to fabricate a small-dimensional bimetallic composite of WC-10Co and high strength AISI 4340 steel, where the cermet was used in powder form and the steel as solid. The bimetal composite was characterised by microstructural analysis and mechanical properties evaluation. The interface microstructure reveals a successful metallurgical bonding between the cermet and steel materials. The influence of sintering temperature (1050–1250 °C) was examined at intervals of 50 °C. This study shows that the properties of sintered powder and the bonding quality with the steel improve with an increase in sintering temperature. A bonding beneficiary reaction layer was observed to grow at the joining interface by mutual diffusion of the alloying elements, which increases with the increasing temperature. The maximum width of the reaction layer observed was 4.13 μm and consists mainly of intermetallic ternary carbides. The bonding shear strength of the interface is found to be slightly higher than claimed in previous studies. The developed bimetal composite could be used in applications where a combination of high strength and hardness is required.
KeywordsPowder–solid bonding Cermet–metal layered composite Mutual diffusion Hot compaction diffusion bonding
We acknowledge the use of facilities within the UOW Electron Microscopy Centre.
The authors received financial support from the Australian Research Council (ARC) for the current study.
- 7.Lemus-Ruiz J, Salas-Villaseñor AL, Flores O (2009) Joining of WC-Co to Ni by direct diffusion bonding. Advanced Materials Research 68:127–132Google Scholar
- 24.Prathabrao M, Amin SYM, Ibrahim M (2017) Review on sintering process of WC-Co cemented carbide in metal injection molding technology. In: IOP Conference Series: Materials Science and Engineering. IOP PublishingGoogle Scholar
- 30.Inc., D.S (2017) Offering versatility and performance for today’s demanding research and production applications. The Gleeble 3500 Thermal System. Available from: https://www.gleeble.com/products/gleeble-3500.html
- 32.Santhanam AT, Tierney P, Hunt JL (1990) Powder metallurgy. ASM handbook, vol 7. ASM International, Metals ParkGoogle Scholar
- 34.West EG (1982) Copper and its alloys. Ellis Horwood Ltd./Halsted Press, Chichester, England. Edition 1Google Scholar
- 36.Tarraste M et al (2015) Reactive sintering of bimodal WC-Co hardmetals. Mater Sci 21(3):382–385Google Scholar
- 44.Hoppin GS et al (1972) Powder for diffusion bonding of superalloy members. Google PatentsGoogle Scholar
- 46.Thomazic A, Pascal C, Chaix JM (2010) Fabrication of (cemented carbides/steel) bilayered materials by powder metallurgy. Materials Science Forum 631:239–244Google Scholar
- 57.AZoM (2012) AISI 4340 alloy steel (UNS G43400). Available from: https://www.azom.com/article.aspx?ArticleID=6772
- 58.MatWeb (2013) AISI 4340 steel, annealed, 25 mm round. Available from: http://www.matweb.com/search/DataSheet.aspx?MatGUID=fd1b43a97a8a44129b32b9de0d7d6c1a&ckck=1
- 61.Maheshwari P, Fang ZZ, Sohn HY (2007) Early-stage sintering densification and grain growth of nanosized WC-Co powders. Int J Powder Metall (Princeton, NJ) 43(2):41–47Google Scholar