2018
DOI: 10.1016/j.ijrmhm.2017.11.031
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Strength and reliability of WC-Co cemented carbides: Understanding microstructural effects on the basis of R-curve behavior and fractography

Abstract: Strength and reliability of WC-Co cemented carbides (hardmetals) are dependent on effective fracture toughness as well as on nature, size and distribution of processing flaws. Regarding toughness, they exhibit a crack growth resistance (R-curve) behavior, derived from the development of a multiligament bridging zone at the crack wake. Accordingly, successful implementation of fracture mechanics requires consideration of tangency criterion, between applied stress intensity factor and R-curve, in addition to fra… Show more

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Cited by 30 publications
(16 citation statements)
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References 44 publications
(69 reference statements)
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“…As obtained from Vickers indentation tests, the tungsten carbide‐cobalt coatings sprayed onto the differently pre‐treated 316 L substrates show a fracture toughness K IC of approximately 2.5 MPa √m±0.4 MPa √m. With regard to these results, it is obvious that the fracture toughness K IC is remarkable low compared with either those observed for high velocity oxy‐fuel (HVOF) sprayed tungsten carbide‐cobalt coatings or tungsten carbide‐cobalt cemented carbides [20, 21]. The degree of decarburization in high velocity oxy‐fuel (HVOF)‐sprayed tungsten carbide‐cobalt coatings has a decisive influence on the fracture toughness K IC [22].…”
Section: Resultsmentioning
confidence: 94%
“…As obtained from Vickers indentation tests, the tungsten carbide‐cobalt coatings sprayed onto the differently pre‐treated 316 L substrates show a fracture toughness K IC of approximately 2.5 MPa √m±0.4 MPa √m. With regard to these results, it is obvious that the fracture toughness K IC is remarkable low compared with either those observed for high velocity oxy‐fuel (HVOF) sprayed tungsten carbide‐cobalt coatings or tungsten carbide‐cobalt cemented carbides [20, 21]. The degree of decarburization in high velocity oxy‐fuel (HVOF)‐sprayed tungsten carbide‐cobalt coatings has a decisive influence on the fracture toughness K IC [22].…”
Section: Resultsmentioning
confidence: 94%
“…The performance of these metal binder phase depends on usage, performance criterion was to determine and analyseimpactful of fatigue strength leading to rupture and Fatigue crack growth (FCG) [10], [14].Fatigue strength explains number of times the applied stress loading will eventually cause fracture of material. The cemented carbide fatigue crack growth is linearly increases on threshold of cemented mean carbide grain size and mechanism of crack deflection ismore effective action for fatigue growth mechanisms [39] therefore coarsed hard metals are normally sensitive to fatigue behavior rather than binder mean free path which has fine-graded materials [23], [24]. From this observation, it is clear that individual deliberation of collective effects about altering binder content of carbide grain size is very important for the existence of different approaches between monotonic loading properties as considered for comparison [40].…”
Section: Fatigue Behavior Of Cemented Carbidementioning
confidence: 99%
“…This clearly identify the origin and propagation of cracks in work roll and identify critical zone where there is application of multiaxial principlesloading [33], [39]. Here,different analysis is doneand results compared to the measurements obtained from analysis of component failure.…”
Section: Fatigue Behavior Of Cemented Carbidementioning
confidence: 99%
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