High-temperature fatigue of cemented carbides under cyclic loads

Kindermann, P.; Schlund, P.; Sockel, H. G.; Herr, M.; Heinrich, W.; Görting, K; Schleinkofer, Uwe

doi:10.1016/s0263-4368(99)00014-1

Cited by 67 publications

(16 citation statements)

References 14 publications

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“…Varying testing temperatures up to 700°C encounters lifetimes significantly below the values determined at room temperature. The behaviour of hard metals under cyclic loads cannot be deduced from their behaviour under static loading conditions [9]. Has studied the microstructure of friction welded cu/al joint and its weld interface characterization were identified and discussed and also the correlation between the microstructure and mechanical properties has been investigated [10].…”

Section: Studies On Microstructure Analysismentioning

confidence: 99%

Review on Microstructure Analysis of Metals and Alloys Using Image Analysis Techniques

Rekha

Raja

2017

IOP Conf. Ser.: Mater. Sci. Eng.

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Section: Studies On Microstructure Analysismentioning

confidence: 99%

Review on Microstructure Analysis of Metals and Alloys Using Image Analysis Techniques

Rekha

Raja

2017

IOP Conf. Ser.: Mater. Sci. Eng.

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“…According to Fish et al (1959), softening of the tool material occurs under the influence of high frictional heat [19]. Kindermann et al (1999) have reported fatigue effects produced by variations in temperature (range 25 o -900 o C).…”

Section: Literature Surveymentioning

confidence: 99%

“…A road header with attached picks [37] At higher temperature, cobalt binder undergoes oxidation phenomenon [26]. Lagerquist (1975) has found thermal fatigue crack propagation in cemented carbide [27].…”

Section: Figmentioning

confidence: 99%

MICROSTRUCTURAL STUDY OF FAILURE PHENOMENA IN WC 94%-Co 6% HARD METAL ALLOY TIPS OF RADIAL PICKS

Nahak¹,

Chattopadhyaya²,

Dewangan

et al. 2017

Adv. Sci. Technol. Res. J.

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An excellent combination of hardness, strength, stiffness and high melting point has proved the WC-Co as an ideal material for tools that are used for metal cutting, coal mining, oil drilling, etc. The ongoing research in WC-Co is focussed on enhancing its wear resistant properties as much as possible. For the purpose, many attempts have been made to study the tribological behaviour of WC-Co for a long time. Researchers have used various grades of WC-Co in different working environments and accordingly they have characterized the wear phenomena involved there within. In this direction of research, the present paper makes an attempt to understand various wear behaviours in WC 94%-Co 6% hard metal alloy. WC-Co was used as a tip of the coal cutting tool named radial pick. Two radial picks have been taken for critical analysis through field emission scanning electron microscopy (FESEM) attached with energy dispersive Xray spectroscopy (EDS). In this work, the failure behaviours in the tools have been divided into five categories: (1) Abrasion on individual grain; (2) Corrosion in carbide grains; (3) Fragmentation and removal of WC grains; (4) Pores in WC grains; and (5) Coal and rock embedding. The most possible reasons behind each failure phenomenon have been explained comprehensively with the help of high-resolution microscopic images. However, it is usually observed that, initially, the tool gets minor cracks due to sudden impact. These cracks provide a path to the rock and coal particles to get entrenched inside the microstructure of cemented carbide. Finally, the intermixed external elements degrade the binder content (i.e. cobalt) and the tool becomes useless.

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“…To date, it is the most complete work following the S-N approach and it was complemented by detailed electron microscopic analysis, both TEM and scanning electron microscopy (SEM), of microscopic features on fracture surfaces and of the microstructure in the volume in the wake and in the front of growing cracks (Erling, Kursawe, Luyckx, & Sockel, 2000;Kindermann et al, 1999;Kursawe, Pott, Sockel, Heinrich, & Wolf, 2001;Sailer et al, 2001;Schleinkofer, Sockel, Görting, & Heinrich, 1996a;Schleinkofer, Sockel, Görting, & Heinrich, 1996b;Schleinkofer, Sockel, Görting, & Heinrich, 1997;Schleinkofer, Sockel, Schlund, Görting, & Heinrich, 1995;Schlund et al, 1999).…”

Section: Strength Degradation Under Cyclic Loadsmentioning

confidence: 99%

“…This is particularly relevant for the case of cemented carbides, materials where it is now well established that crack initiation is invariably associated with some preexisting defect (e.g. Schleinkofer et al, 1997); thus, the subcritical growth of these flaws is indeed the controlling stage in their fatigue failure (Erling et al, 2000;Kindermann et al, 1999;Kursawe et al, 2001;Sailer et al, 2001;Schleinkofer et al, 1996aSchleinkofer et al, , 1996bSchleinkofer et al, 1997;Schlund et al, 1999). Along the 1970s, the advent of fracture mechanics application to cemented carbides (Chermant, Deschanvres, & Iost, 1973;Exner, Walter, & Pabst, 1974;Ingelström & Nordberg, 1974;Kenny, 1971;Lueth, 1974) brought along the challenge of developing methodologies for introducing sharp stress-free cracks into these materials.…”

Section: Fatigue Crack Growthmentioning

confidence: 99%