Mechanical Behavior of Hardmetals at High Temperature

Mari, Daniele

doi:10.1016/b978-0-08-096527-7.00014-3

Cited by 15 publications

(14 citation statements)

References 39 publications

(55 reference statements)

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“…After sintering at 800°C for 30 min, the transformation of phases took place – additional M 7 C 3 phase appeared during solid-state sintering. After sintering at 1200°C for 30 min, WC lines disappeared as WC dissolves mainly in the inner rim of titanium carbide [6]. During the sintering in the temperature range 1200–1500°C for 30 min, no remarkable changes in phase composition occurred (see Figure 3).…”

Section: Resultsmentioning

confidence: 99%

“…Therefore, it is of interest to find a satisfactory alternative binder phase to replace critical materials totally or partially, thereby reducing the dependence on these strategic materials in the future. Low-cost and abundant Fe, which is not harmful to human body, is the most popular alternative as a binder for Ni- and Co-free cemented carbides [6]. Ti(C,N)-based cermets have demonstrated high performance in wear parts and semi-finishing or finishing cutting tools.…”

Section: Introductionmentioning

confidence: 99%

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Microstructure evolution of TiC cermets with ferritic AISI 430L steel binder

et al. 2018

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From the outlook of healthcare, economic importance and supply risk, utilisation of raw materials like tungsten, cobalt and nickel should be reduced or replaced with other metals. Nontoxic titanium carbide and iron are the top-of-the-line solution for displacing these materials. Our focus was on conventionally fabricated titanium carbide-based cermets with a chromium ferritic steel binder. To study microstructural evolution, specimens were sintered at different temperatures (600-1500°C). We used a scanning electron microscopy, X-ray diffraction and differential scanning calorimetry to analyse the microstructure and phase formation of the cermets. Our results showed that during the solid and liquid phase sintering of the TiC-FeCr cermet, chromium ferrous complex carbides M 7 C 3 are formed and as a result, chromium content in the binder phase is decreased. Alloying TiC-FeCr cermets with strong carbide formers improves the structural homogeneity of the cermets. Also, mechanical characteristics (hardness, fracture toughness) were evaluated.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Microstructure evolution of TiC cermets with ferritic AISI 430L steel binder

et al. 2018

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“…Cermets constituted by WC-Co or TiCN-Co are important materials for the manufacturing of cutting tools. Since the tool working conditions involve high temperatures, the mechanisms leading to plastic deformation have been investigated extensively 6 . GBS has been considered as the main mechanism of high temperature creep.…”

Section: Cermetsmentioning

confidence: 99%

“…In all cases, GBS must be associated with bulk deformation in order to keep the coherency of the material 5 . The presence of a phase different from that of the matrix in the grain boundary is also determinant for the deformation of composite materials such as cermets 6 . In particular, a change of the thermodynamical equilibrium under stress allows the infiltration of cobalt of WC boundaries in WC-Co based cemented carbides 7 .…”

Section: Introductionmentioning

confidence: 99%

The Contribution of Mechanical Spectroscopy to Understanding Grain Boundary Sliding

Mari

2018

Mat. Res.

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This review paper shows that grain boundary sliding (GBS) is a general phenomenon occurring in all classes of inorganic materials: ceramics, metals and composite materials. The occurrence of relaxations attributed to GBS is also quite general and therefore the mechanical spectroscopy constitutes a sensitive and universal technique to study such phenomenon. GBS is widely observed in ceramics. It can be due to the presence of an amorphous layer between the grains as in zirconia or to dislocations, as in alumina. In each case, a high temperature GBS peak has been identified. In metals, GBS is observed in some deformed materials but the correlation of such phenomenon with internal friction peaks has been controversial. In 1941, C. Zener describes a geometrical model of GBS that could give rise to a relaxation mechanism. In 1947, Kê observed a large relaxation peak in polycrystalline aluminum. This peak being absent in single crystals, the relaxation was attributed to GBS. Today, the Zener model can still be used in most cases for relaxations occurring in the grain boundaries. Instead, according to the grain boundary type, the material or the temperature, either dislocations or the gliding of a disordered layer produce the grain boundary relaxations.

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“…Creep resistance underlies the performance of many applications for WC hardmetals. For example, during metal cutting, the tip temperature can exceed 1000 °C [1], at which point WC hardmetals deform extensively by plastic deformation, leading to tool shape change and eventual failure.…”

Section: Introductionmentioning

confidence: 99%