Three-point bending fatigue behavior of WC–Co cemented carbides

Fatigue of Cemented Carbides

“…In general, they correspond to actions much more limited in scope, from a fatigue perspective, than the referred program. All these studies have somehow confirmed already established cyclic stress effects on hardmetals (Ferreira, Pina Amaral, Antunes, & Costa, 2009;Gee, Mingard, & Roebuck, 2009;Ishihara, Goshima, Yoshimoto, & Sabu, 1999;Klaasen, Kübarsepp, Tsinjan, & Sergejev, 2011;Kluensner et al, 2009;Klünser et al, 2010;Li, Zhao, Wang, Gao, & Tang, 2013;Roebuck, 2002;Roebuck, Maderud, & Morrell, 2008;Roebuck, Mingard, Nordenstrom, & Halling, 2009;Sakagami, Kouno, & Yamamoto, 2007;Sakagami & Yamamoto, 2006;Sergejev, Preis, Hussainova, & Kübarsepp, 2008;Sergejev, Preis, Kübarsepp, & Antonov, 2008), but some of them include interesting new findings and approaches. For instance, Klünser et al (Kluensner et al, 2009;Klünser et al, 2010) reported for different WC-Co alloys the existence of ratcheting behavior in their cyclic stress-strain curve, determined under uniaxial compression loading for stress ratios of À1 and À3, and applied compressive stresses above the elastic limit.…”

“…Although the use of notched specimens by the National Physics Laboratory's (NPL's) group is rather focused on the evaluation of the thermomechanical fatigue response of cemented carbidesdas originally aimed (Roebuck & Gee, 1996;Dary, Roebuck, & Gee, 1999), and corresponding results to be commented in a later sectiondit clearly represents an interesting complementary testing methodology for evaluating and understanding microstructural effects on these materials. Notched specimens have also been employed in several studies recently, although following different objectives: assessment of fatigue notch sensitivity of cermets (Sergejev, Preis, Hussainova, et al, 2008), evaluation of high-temperature fatigue strength (Ferreira et al, 2009), and analysis of microstructural effects on fatigue behavior (Li et al, 2013). The results presented in these studies are promising regarding suitability of using notched specimens for assessing microstructural effects on fatigue response under service-like conditions, i.e.…”

Some recent results on the fatigue strength of notched specimens made of 40CrMoV13.9 steel at room and high temperature

“…At the best of authors knowledge, a complete set of data from notch specimens under torsion and combined tension and torsion loadings are not available in the literature for 40CrMoV13.9 whereas other Cr steels have been widely investigated (see, among the others, [4146]). The phenomenon of fatigue is critical in many sectors, not only dealing with structural steels [47]. It is a common task for engineers engaged in fatigue problems to search suitable solutions for improving the life of the components both acting on the material (see, for example, [48]) and on the geometry of the components.…”

Fatigue testing and properties of hardmetals in the gigacycle range

“…The extensive studies for characterization of hardmetals included mechanical testing both in monotonic and in cyclic loading [1][2][3][4][5][6][7][8][9]. It is difficult to test fairly brittle materials in push-pull mode, since even a slight misalignment results in incorrect data.…”