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 MSA  Vol.9 No.4 , April 2018
Crack Growth Behavior in Cemented Carbide by Repeated Thermal Shock
Abstract: In this study, fatigue crack growth (FCG) behavior of cemented carbide under the repeated thermal shock (RTS) was experimentally evaluated by using the thermal-shock experiment method developed by the authors. Tests were carried out using cemented carbide having two different WC crystal grain sizes. In addition, FCG behavior under rotating bending fatigue (RBF) test was investigated using the same cemented carbides. Then the FCG results obtained by the RTS test and the results of the RBF test obtained at stress ratio, R = -1, were compared with each other. Here, the stress ratio R is defined as, R = σminmax; σmin and σmax are the minimum and the maximum stresses, respectively. From this comparison, it was found that the relation between the rate of fatigue crack growth (FCG) and the maximum stress intensity factor in the RTS tests was equivalent to the one obtained under the RBF tests at stress ratio of -1. From a practical point of view, this result is important as it indicates that it is not necessary to purposely perform RTS experiments. In this research, the effect of WC grain size on the short surface FCG behavior of the cemented carbide was also studied and discussed.
Cite this paper: Ishihara, S. , Shibata, H. , Masuda, K. , Mikado, H. and Ishiguro, M. (2018) Crack Growth Behavior in Cemented Carbide by Repeated Thermal Shock. Materials Sciences and Applications, 9, 345-356. doi: 10.4236/msa.2018.94023.
References

[1]   Tsuji, T., Noda, N. and Suto, M. (1992) Initial Temperature Effect of the Critical Value of the Generalized Stress Intensity Factor by Using Molecular Dynamics. Theoretical and Applied Mechanics, 42, 129.

[2]   Ettmayer, P., Kolaska, H. and Ortner, H.M. (2014) History of Hardmetals. In: Salin, V.K., Mari, D. and Llanes, L., Eds., Comprehensive Hard Materials, 1st Edition, Elsevier, 1, 3-27.
https://doi.org/10.1016/B978-0-08-096527-7.00001-5

[3]   Ishihara, S., Goshima, T., McEvily, A.J. and Ishizaki, T. (1999) On Fatigue Damage and Small Crack Growth Behavior of Silicon Nitride under Cyclic Thermal Shock Loading. In: Ravichandran, K.S., Ritchie, R.O. and Murakami, Y., Eds., Small Fatigue Cracks: Mechanics and Mechanisms and Applications, Elsevier, 421-428.

[4]   Hasselman, D.P.H. (1969) Unified Theory of Thermal Shock Fracture Initiation and Crack Propagation in Brittle Ceramics. Journal of the American Ceramic Society, 52, 600-604.
https://doi.org/10.1111/j.1151-2916.1969.tb15848.x

[5]   Bronitsky, G. and Hamer R. (1986) Experiments in Ceramic Technology: The Effects of Various Tempering Materials on Impact and Thermal-Shock Resistance. American Antiquity, 51, 89-101.
https://doi.org/10.2307/280396

[6]   Wang, H. and Singh, R.N. (2013) Thermal Shock Behaviour of Ceramics and Ceramic Composites. International Materials Reviews, 18, 228-244.

[7]   Yoshimoto, T., Ishihara, S., Goshima, T., McEvily, A.J. and Ishizaki, T. (1999) An Improved Method for The Determination of the Maximum Thermal Stress Induced during a Quench Test. Scripta Materialia, 41, 553–559.
https://doi.org/10.1016/S1359-6462(99)00185-2

[8]   Ishihara, S., Goshima, T., Iwawaki, S., Shimizu, M. and Kamiya, S. (2002) Evaluation of Thermal Stresses Induced in Anisotropic Material during Thermal Shock. Journal of Thermal Stresses, 25, 647-661.
https://doi.org/10.1080/01495730290074351

[9]   Ishihara, S. and McEvily, A.J. (2009) On the Early Initiation of Fatigue Cracks in the High Cycle Regime. Proceeding of 12th International Conference on Fracture, Ottawa, 12-17 July 2009, CD-ROM (10 p).

[10]   Newman, J.C. and Raju, I.S. (1979) NASA Technical Paper, 1578.

[11]   Ishihara, S., Goshima, T., Nomura, K. and Yoshimoto, T. (1999) Crack Propagation Behavior of Cermets and Cemented Carbides under Repeated Thermal Shocks by the Improved Quench Test. Journal of Materials Science, 34, 629-636.
https://doi.org/10.1023/A:1004575519293

[12]   Fry, P.R. and Garrett, G.G. (1988) Fatigue Crack-Growth Behavior of Tungsten Carbide Cobalt Hard Metals. Journal of Materials Science, 23, 2325-2338.
https://doi.org/10.1007/BF01111884

[13]   Shang, J.K. and Ritchie, R.O. (1989) Crack Bridging by Uncracked Ligaments during Fatigue-Crack Growth in SiC-Reinforced Aluminum-Alloy Composites. Metallurgical and Materials Transactions A, 20, 897-908.
https://doi.org/10.1007/BF02651656

[14]   Cox, B.N. and Marshall, D.B. (1991) Crack Bridging in the Fatigue of Fibrous Composites. Fatigue & Fracture of Engineering Materials & Structures, 14, 847-861.
https://doi.org/10.1111/j.1460-2695.1991.tb00716.x

[15]   Guiu, F., Li, M. and Reece, M.J. (1992) Role of Crack-Bridging Ligaments in the Cyclic Fatigue Behavior of Alumina, 75, 2976-2984.

[16]   Cox, B.N. and Marshall, D.B. (1994) Concepts for Bridged Cracks in Fracture and Fatigue. Acta Metallurgica et Materialia, 42, 341-363.
https://doi.org/10.1016/0956-7151(94)90492-8

[17]   Hu, X. and Mai, Y.W. (1992) Crack-Bridging Analysis for Alumina Ceramics under Monotonic and Cyclic Loading, Journal of the American Ceramic Society, 75, 848-853.
https://doi.org/10.1111/j.1151-2916.1992.tb04150.x

 
 
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