Investigation of Sinterability of WC-Co Component Comprising of AISI 4340 Steel Inserts

Year 2023, Volume: 36 Issue: 4, 1722 - 1731, 01.12.2023

Mehmet Subaşı , Harun Koçak , Asghar Safarian , Çetin Karataş

https://doi.org/10.35378/gujs.1070501

Abstract

In this study, sinterability of WC-9% Co component with AISI 4340 steel insert was investigated using Inserted Powder Injection Molding (IPIM) method. Sintering experiments were performed at temperatures of 1200 °C to 1350 °C with dwell times of 120, 240, 360 min. Defects such as gaps, cracks and macro-porosities were observed in specimens, sintered at temperatures of 1200 °C and 1250 °C for all dwell times. It was proved that sintering temperature of 1350 °C was as high as it caused insert to get deformed and melted. As a result, the optimum sintering temperature and dwell time were determined to be 1300 °C and 240 min, respectively, at which the highest hardness, compression strength, and sintered density were obtained without any defects such as cracks or gaps.

Keywords

WC-Co feedstock, AISI 4340 steel, Sintering, Inserted powder injection molding

Supporting Institution

The Scientific and Technological Research Council of Turkey (TUBİTAK)

Project Number

115M437

References

• [1] Karataş, Ç., Sarıtaş, S., "Toz enjeksiyonla kalıplama: Bir ileri teknoloji imalat metodu", Journal of the Faculty of Engineering and Architecture of Gazi University, 13(2): 193-228, (1998).
• [2] German, R.M., Powder Injection Molding, In ASM Handbook: Powder Metal Technologies and Applications, (1998).
• [3] Safarian, A., Subaşi, M. and Karataş, Ç., "Reducing debinding time in thick components fabricated by powder injection molding", International Journal of Materials Research, 106(5): 527-531, (2015).
• [4] Safarian, A., Subaşi, M. and Karataş, Ç., "The effect of sintering parameters on diffusion bonding of 316L stainless steel in inserted metal injection molding", The International Journal of Advanced Manufacturing Technology, 89(5): 2165-2173, (2017).
• [5] Koçak, H., Samet, K., Yılmaz, O. and Karataş, Ç., "Investigation of composite part production from WC-Co/HSS using nickel interlayer by inserted powder injection molding method", Gazi University Journal of Science Part C : Design and Technology, 6(2): 374-384, (2018).
• [6] Johnson, J.L., Tan, L.K., Suri, P. and German, R.M., "Design guidelines for processing bi-material components via powder-injection molding", The Journal of The Minerals, Metals & Materials Society, 55(10): 30-34, (2003).
• [7] Heaney, D.F., Suri, P. and German, R.M., "Defect-free sintering of two material powder injection molded components Part I Experimental investigations", Journal of Materials Science, 38(24): 4869-4874, (2003).
• [8] Guo, Y., Wang, Y., Gao, B., Shi, Z. and Yuan, Z., "Rapid diffusion bonding of WC-Co cemented carbide to 40Cr steel with Ni interlayer: Effect of surface roughness and interlayer thickness", Ceramics International, 42(15): 16729-16737, (2016).
• [9] Rodelas, J., Hilmas, G. and Mishra, R.S., "Sinterbonding cobalt-cemented tungsten carbide to tungsten heavy alloys", International Journal of Refractory Metals and Hard Materials, 27(5): 835-841, (2009).
• [10] Simchi, A., Petzoldt, F., "Cosintering of powder injection molding parts made from ultrafine WC-Co and 316L stainless steel powders for fabrication of novel composite structures", Metallurgical and Materials Transactions A, 41(1): 233, (2009).
• [11] Sun, Y., Su, W., Yang, H. and Ruan, J., "Effects of WC particle size on sintering behavior and mechanical properties of coarse grained WC–8Co cemented carbides fabricated by unmilled composite powders", Ceramics International, 41 (10): Part B, 14482-14491, (2015).
• [12] Pötschke, J., Säuberlich, T., Vornberger, A. and Meese-Marktscheffel, J.A., "Solid state sintered nanoscaled hardmetals and their properties", International Journal of Refractory Metals and Hard Materials, 72, 45-50, (2018).
• [13] Sun, L., Jia, C-C. and Xian, M., "A research on the grain growth of WC–Co cemented carbide", International Journal of Refractory Metals and Hard Materials, 25 (2) : 121-124, (2007).
• [14] Koçak, H., Subaşı, M. and Karataş, Ç., "Sinter bonding of AISI 4340 and WC-Co using Ni interlayer by inserted powder injection molding", Ceramics International, 45, 22331-22335, (2019).
• [15] Heng, S.Y., Muhamad, N., Sulong, A.B., Fayyaz, A. and Amin, M.S., "Effect of sintering temperature on the mechanical and physical properties of WC–10%Co through micro-powder injection molding (μPIM)", Ceramics International, 39 (4) : 4457-4464, (2013).
• [16] Eso, O., Fang, Z. and Griffo, A., "Liquid phase sintering of functionally graded WC–Co composites", International Journal of Refractory Metals and Hard Materials, 23(4): 233-241, (2005).
• [17] German, R.M., Bose, A., Injection Molding of Metals and Ceramics. First edition edn. Metal Powder Industries Federation, New Jersey: Princeton, (1997).
• [18] Upadhyaya, G. S., Cemented Tungsten Carbides: Production, Properties, and Testing. Noyes Publications, New Jersey, (1998).
• [19] Haglund, S., Ågren, J., "W content in Co binder during sintering of WC–Co", Acta Materialia, 46(8): 2801-2807, (1998).
• [20] Allibert, C.H., "Sintering features of cemented carbides WC–Co processed from fine powders", International Journal of Refractory Metals and Hard Materials, 19(1): 53-61, (2001).
• [21] Konyashin, I., Hlawatschek, S., Ries, B., Lachmann, F., Dorn, F., Sologubenko, A. and Weirich, T., "On the mechanism of WC coarsening in WC–Co hardmetals with various carbon contents", International Journal of Refractory Metals and Hard Materials, 27(2): 234-243, (2009).
• [22] Sugiyama, I., Mizumukai, Y., Taniuchi, T., Okada, K., Shirase, F., Tanase, T., Ikuhara, Y. and Yamamoto, T., "Carbon content dependence of grain growth mode in VC-doped WC–Co hardmetals", International Journal of Refractory Metals and Hard Materials, 52, 245-251, (2015).
• [23] Konyashin, I., Ries, B. and Lachmann, F., "Near-nano WC–Co hardmetals: Will they substitute conventional coarse-grained mining grades", International Journal of Refractory Metals and Hard Materials, 28(4): 489-497, (2010).
• [24] http://www.ryerinc.com. Access date: 10.06.2019.
• [25] Erdoğan, M., Erol, A. and Yönetken, A., "Characterization and mechanical properties of WC-Co based scratch", Afyon Kocatepe University Journal of Sciences and Engineering, 13 (025701) : 1-11, (2013).
• [26] Fabijanić, T. A., Alar, Ž. and Ćorić, D., "Influence of consolidation process and sintering temperature on microstructure and mechanical properties of near nano-and nano-structured WC-Co cemented carbides, International Journal of Refractory Metals and Hard Materials, 54, 82-89, (2016).
• [27] Sarıtaş, S., Türker, M. and Durlu, N., Toz Metalurjisi ve Parçacıklı Malzeme İşlemleri Türk Toz Metalurjisi Deneği, Ankara, (2007).
• [28] Okamoto, S., Nakazono, Y., Otsuka, K., Shimoitani, Y. and Takada, J., "Mechanical properties of WC/Co cemented carbide with larger WC grain size", Materials Characterization, 55(4): 281-287, (2005).
• [29] Mandel, K., Radajewski, M. and Krüger, L., "Strain-rate dependence of the compressive strength of WC–Co hard metals", Materials Science and Engineering: A, 612, 115-122, (2014).
• [30] German, R.M., Liquid Phase Sintering. Springer, Boston, MA, Rensselaer Polytechnic Institute Troy, (1985).