Optimization of Structure of Hardmetal Reinforced Iron-Based PM Hardfacings for Abrasive Wear Conditions

Abstract:

This paper focuses on the influence of hardmetal reinforcement amount, shape and size on the abrasive wear resistance of composite iron self-fluxing alloy (FeCrSiB) based hardfacings produced by the powder metallurgy (PM) technology. First, the size of the reinforcement (1 – 2.5 mm) was fixed, but its shape (angular or spherical) and amount (0 – 50 vol%) were varied. Then the reinforcement shape (angular) and amount (50 vol%) were kept constant, while its size (0.16 – 0.315 mm fine reinforcement and 1 – 2.5 mm coarse reinforcement) and proportion of fine and coarse reinforcement (all fine, all coarse, half fine-half coarse) were varied. ASTM G65 abrasive rubber wheel wear test was applied to find out the wear resistance of the hardfacings; an unreinforced self-luxing alloy (FeCrSiB) hardfacing was the reference material. Volumetric wear rate was calculated according to the weight loss. Worn surfaces were studied under scanning electron microscope. As a result, an optimal composition of the hardmetal containing Fe-based hardfacings based on the reinforcement amount (vol%), shape (irregular or spherical) and size (fine or coarse) is given.

• Periodical: Key Engineering Materials (Volume 721)
• Pages: 351-355
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.721.351
• Online since: December 2016
• Authors: Taavi Simson*, Priit Kulu, Andrei Surzhenkov, Dmitri Goljandin, Riho Tarbe, Marek Tarraste, Mart Viljus
• Keywords: Abrasive Wear, Hardfacing, Hardmetal Reinforcement, Powder metallurgy, Twomodal Reinforcement

References

[1] P. Kulu, J. Halling, Recycled hard metal-base wear resistant composite coatings, J. Therm. Spray. Techn., 7 (1998) 173-178.

DOI: 10.1361/105996398770350882

[2] P. Kulu, R. Tarbe, A. Žikin, H. Sarjas, A. Surženkov, Abrasive wear resistance of recycled hardmetal reinforced thick coating. Key. Eng. Mat., 527 (2013) 185-190.

DOI: 10.4028/www.scientific.net/kem.527.185

[3] P. Kulu, A. Surzhenkov, R. Tarbe, M. Viljus, M. Saarna, M. Tarraste, Hardfacings for abrasive wear applications. Proc. 28th Int. Conf. Surface Modification Technologies, Tampere, Finland, 16-18th of June 2014, 149-157.

DOI: 10.1088/1742-6596/843/1/012060

[4] H. Sarjas, D. Goljandin, P. Kulu, V. Mikli, A. Surženkov, P. Vuoristo, Wear resistant thermal sprayed composite coatings based on iron self-fluxing alloy and recycled cermet powders. Mater. Sci-Medzg 18 (2012) 34-39.

DOI: 10.5755/j01.ms.18.1.1338

[5] A. Zikin, I. Sotiraq, P. Kulu, I. Hussainova, C. Katsich, E. Badisch, Plasma Transferred Arc (PTA) hardfacing of recycled hardmetal reinforced nickel-matrix surface composites. Mater Sci-Medzg 18 (2012) 12-17.

DOI: 10.5755/j01.ms.18.1.1334

[6] H. Rojacz, M. Varga, H. Kerber, H. Winkelmann, Processing and wear of cast MMCs with cemented carbide scrap. J. Mater. Process. Tech. 214 (2014) 1285-1292.

DOI: 10.1016/j.jmatprotec.2014.01.011

[7] T. Simson, P. Kulu, A. Surženkov, R. Tarbe, M. Viljus, M. Tarraste, D. Goljandin, Optimization of reinforcement content of powder metallurgy hardfacings in abrasive wear conditions. Proc. Estonian Acad. Sci. 65 (2016) 90-96.

DOI: 10.3176/proc.2016.2.03

[8] V. Mikli, H. Käerdi, P. Kulu, M. Besterci, Characterization of powder particle morphology. Proc. Estonian Acad. Sci. Eng. 7 (2001) 22-34.

DOI: 10.3176/eng.2001.1.03

[9] Mechanical and Metal Trades Handbook (Estonian translation), TUT Press, 2012, 116-117.

[10] I. Hussainova, On micromechanical problems of erosive wear of particle reinforced composites, Proc. Estonian Acad. Sci. Eng. 11 (2005) 47-58.

DOI: 10.3176/eng.2005.1.04