Experimental strategy to study the mechanical behaviour of hardmetals for cutting tools

Mari, Daniele; Bolognini, S.; Feusier, G.; Viatte, T.; Benoît, W.

doi:10.1016/s0263-4368(98)00078-x

Cited by 75 publications

(39 citation statements)

References 29 publications

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“…Hardmetals based on the cubic carbides exhibit similar behavior with excessive ductile fracture through the binder phase on alloys with lower hardness, but the crack propagation preference changes to the dominant brittle fracture through the carbide phase on alloys with higher hardness (Mari, Bolognini, Feusier, Viatte, & Benoit, 1999;Viswanadham & Precht, 1980;Warren & Matzke, 1983).…”

Section: Dependencies Of Crack Propagationmentioning

confidence: 99%

“…At room temperature, the hardmetals exhibit brittle fracture behavior on the macrolevel, but on the microlevel both the brittle fracture of the carbide phase and the ductile fracture of the binder phase are observed (Fischmeister, 1983;Gurland, 1988;Johannesson & Warren, 1988;Mari, Bolognini, Feusier, Viatte, & Benoit, 1999;Sigl & Exner, 1987). Two-phase cemented carbides have the following four modes of fracture beside the fracture of defects ( Figure 1) (Almond, 1983;Chermant & Osterstock, 1976;Hong & Gurland, 1983;Lea & Roebuck, 1981;Luyckx, 1977;Nabarro & Bartolucci Luyckx, 1968): C: transgranular fracture through the carbide crystals; C/C: intergranular fracture of the carbide phase along the carbide-carbide boundaries; B/C: fracture along or close to the carbide-binder interfaces; B: ductile fracture through the binder phase.…”

Section: Fracture Modesmentioning

confidence: 99%

“…In other words, crack prefers to fracture the ductile binder, rather than the brittle carbide phase, despite the increase of the total fracture energy. Nevertheless, the excessive ductile fracture through the binder phase on the microlevel does not change the overall brittle character of the fracture on the macrolevel of the cemented carbides at room temperature (Fischmeister, 1983;Gurland, 1988;Johannesson & Warren, 1988;Mari, Bolognini, Feusier, Viatte, & Benoit, 1999;Sigl & Exner, 1987). Crack branching and scattering are extremely rare for hardmetals.…”

Section: Dependencies Of Crack Propagationmentioning

confidence: 99%

See 2 more Smart Citations

Fracture and Strength of Hardmetals at Room Temperature

Shatov¹,

Ponomarev

Фирстов

2014

Comprehensive Hard Materials

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Section: Dependencies Of Crack Propagationmentioning

confidence: 99%

Section: Fracture Modesmentioning

confidence: 99%

Section: Dependencies Of Crack Propagationmentioning

confidence: 99%

See 1 more Smart Citation

Fracture and Strength of Hardmetals at Room Temperature

Shatov¹,

Ponomarev

Фирстов

2014

Comprehensive Hard Materials

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“…3 while in service [1][2][3][4]. It has been reported that the formation of defects at high temperature as a result of oxidation and the growth of the pre-existing flaws are the main causes of the loss of stiffness, mechanical strength and fracture toughness during service [9][10][11][12].…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Influence of temperature on the biaxial strength of cemented carbides with different microstructures

Chicardi

Bermejo

Gotor

et al. 2018

International Journal of Refractory Metals and Hard Materials

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Abstract. The effect of the temperature on the mechanical strength of WC-Co cemented carbides with different microstructures (grain size and binder content) was evaluated. Biaxial flexural tests were performed on three cemented carbide grades at 600°C using the ball-on-three-balls (B3B) method. Results were interpreted by Weibull statistics and compared to biaxial strength results at room temperature. A detailed fractographic analysis, supported by Linear Elastic Fracture Mechanics, was performed to differentiate the nature and size of critical defects and the mechanism responsible for the fracture. A significant decrease in the mechanical strength (around 30%) was observed at 600ºC for all grades of cemented carbides. This fact was ascribed to the change in the critical flaw population from sub-surface (at room temperature) to surface defects, associated with the selective oxidation of Co. Additionally, an estimation of the fracture toughness at 600°C was attempted for the three cemented carbides, based upon the B3B strength results, the corresponding number of the tested specimens fragments and the macroscopic area of the B3B fracture surfaces. The fracture toughness was not ACCEPTED MANUSCRIPT A C C E P T E D M A N U S C R I P T2 affected by the temperature, at least up to 600ºC. In addition, the good agreement with the Single Edge Notch Beam toughness data suggests the possibility of employing this approach for fracture toughness evaluation of brittle materials under different testing conditions.

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“…Mechanical Spectroscopy is a technique that measures the damping capacity of a material [14] that derives from energy dissipation. If a periodic stress is applied to the sample (σ (t) = σ 0 sin (iωt)), the strain (ε(t) = ε 0 sin (i[ωt-ϕ])) lags behing stress by a phase lag ϕ.…”

Section: Introductionmentioning

confidence: 99%

High temperature transformations in a steel-TiCN cermet

Alvaredo

Mari

Gordo

2013

International Journal of Refractory Metals and Hard Materials

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The influence of the carbon content on the microstructure, phase transformation and hardness of an iron-based cermet is studied. The cermet is constituted by a high-alloyed steel as matrix, and TiCN particles (50 vol. %) as reinforcement. The material is produced by conventional powder metallurgy techniques, that is, uniaxial pressing and sintering, and the carbon content is varied from 0 wt % to 1 wt %. The aim of the research is the understanding of the transformations undergone by the material with increasing C amounts when temperature is increased. For this purpose, the cermet is studied by Mechanical Spectroscopy (MS) and Differential Thermal Analysis (DTA) and characterized by XRD, SEM and hardness measurements. The equilibrium phase diagram calculated by Thermocalc software contributes to explain the differences found on phase transformations with respect to the C content of the cermet . 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 High temperature transformations in a steel-TiCN cermet. AbstractThe influence of the carbon content on the microstructure, phase transformation and hardness of an iron-based cermet is studied. The cermet is constituted by a high-alloyed steel as matrix, and TiCN particles (50 vol. %) as reinforcement. The material is produced by conventional powder metallurgy techniques, that is, uniaxial pressing and sintering, and the carbon content is varied from 0 wt % to 1 wt %. The aim of the research is the understanding of the transformations undergone by the material with increasing C amounts when temperature is increased. For this purpose, the cermet is studied by Mechanical Spectroscopy (MS) and Differential Thermal Analysis (DTA) and characterized by XRD, SEM and hardness measurements. The equilibrium phase diagram calculated by Thermocalc software contributes to explain the differences found on phase transformations with respect to the C content of the cermet.

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Experimental strategy to study the mechanical behaviour of hardmetals for cutting tools

Cited by 75 publications

References 29 publications

Fracture and Strength of Hardmetals at Room Temperature

Fracture and Strength of Hardmetals at Room Temperature

Influence of temperature on the biaxial strength of cemented carbides with different microstructures

High temperature transformations in a steel-TiCN cermet

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