Effect of stress ratio on fatigue lifetime and crack growth behavior of WC–Co cemented carbide

Mikado, Hiroko; Ishihara, Sotomi; Oguma, Noriyasu; Masuda, Kazuhiko; Kitagawa, Syo; Kawamura, Shingo

doi:10.1016/s1003-6326(14)63282-9

Cited by 19 publications

(7 citation statements)

References 15 publications

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“…The FCG relationship represented in Equation (3) was used as the basic equation for the analysis [ 31 , 32 , 33 ].

where A is a material constant; and Δ K eff (= K max − K op ) and Δ K effth are the effective stress intensity factor range and threshold of the effective stress intensity factor range, respectively; K max and K op are the maximum stress intensity factor and the crack opening stress intensity factor, respectively.…”

Section: Discussionmentioning

confidence: 99%

Study on the Fatigue Crack Initiation and Growth Behavior in Bismuth- and Lead-Based Free-Cutting Brasses

et al. 2022

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Several studies have been conducted on the fatigue behavior of copper and 7-3, and 6-4 brasses. However, there have been fewer studies on the fatigue behavior and fatigue crack growth (FCG) properties of free-cutting brass, primarily because emphasis has been placed on the development of lead-free free-cutting brass. In this study, fatigue experiments were performed in the atmosphere at room temperature using three types of free-cutting, two types of bismuth (Bi)-based (with different grain sizes), and lead (Pb)-based brasses. It was found that lead-free Bi-based free-cutting brass had approximately the same fatigue performance as that of Pb-based free-cutting brass. It was also clarified that the addition of Bi or Pb initiated fatigue cracks, and that the crack growth period occupied most of the fatigue life. Differences in the FCG behavior of the three free-cutting brasses were observed in the low ΔK range. The modified linear fracture mechanics parameter M was used to quantitatively analyze the fatigue life and FCG behavior (short surface cracks). A comparison between the calculated and experimental results showed that M was useful.

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“…The FCG relationship represented in Equation (3) was used as the basic equation for the analysis [ 31 , 32 , 33 ].

Section: Discussionmentioning

confidence: 99%

Study on the Fatigue Crack Initiation and Growth Behavior in Bismuth- and Lead-Based Free-Cutting Brasses

et al. 2022

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“…Therefore, as number of load cycles increasealso crack length increases and after a certain number of cycles failure of a component occurs [26], [31]. Thefatigue testsi.e., rotating bending and deflection bending, were carried out on a fine-grained WC−Co cemented carbide and major purpose was to evaluate behavior of fatigue and fatigue crack growth [60]. According to the authors experimental observations during fatigue development, it was showed that crack initiation growth cycles occupied fatigue lifetime of tested affected zone for WC−Co cemented carbide [43], [60].…”

Section: Fatigue Behavior Of Cemented Carbidementioning

confidence: 99%

“…The cemented carbides specimen were polished by standard techniques therefore surface quality improved which showed less effects on initiation crack growth in the test of thermal fatigue [61].The fatigue test employs classical methodological approach where experienced and skilled people are involved that produced good and reliable results [34], [62].Cemented carbide materials have strong properties against crack propagation of the deformation of materials reducing stress absorption and concentration so that ductile materials undergo more plastic deformation than become more brittle after some amount of crack tip blunting material at the bottom of crack [43,63]. when stress exceeds material strength then a crack must propagate and enough strain energy must be released as crack grows to generate the new surfaces [43], [60]. For crack to grow, the stress must exceed strength of materials at crack frontier and formation of new surfaces crack occurs, enough strain energy is released to supply required surface energy [37], [43].…”

Section: Fatigue Behavior Of Cemented Carbidementioning

confidence: 99%

A Review on Fatigue Mechanisms and Approaches for Hard metals

Moses

2022

IJSMS

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In this study, fatigue lifemechanisms and approaches for hard metals commonly known as cemented carbides that are supported by literature are reviewed on development of fatigue life technology methods. The hard metals materials are mainly used in engineering systems and failure due to fatigue is common phenomenon in engineering materials.The fatigue crack growth therefore plays very important role towards fatigue failure mechanisms and this remains a setback to engineering fraternity as far as usage of these hard metals are concerned. The fatigue process occurs when a material is subjected to fluctuating stress and strain, this may lead to failure when it accumulates loading due to cumulative damage, multiaxial and variable loading. The Crack initiation growth and micro-mechanisms of damage during fatigue growth with optimization of fatigue life technology approaches and fracture growth resistance are main focus of this review article. Thee review of this paper is based on fatigue life mechanisms adoption methodsfor hard metals with novelty of Crack Tip opening displacement technologyand its implementation in various systems will ought to assist technologists in extraordinary broad programs.In conclusion cumulative damage, fatigue mechanisms, multiaxial amplitude loading and fatigue crack growth mechanics techniques are important andan appropriate fatigue life technology mechanisms methods. Eventually these review article will give potential information on fatigue life technology adoption methods and this helps future researcher and technologists to consider the fatigue life models and these ideas will impact on future application of fatigue life failure mechanisms.

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“…The fatigue and fracture of cemented carbides have been a research focus in the past three decades [6][7][8]. Given the brittle carbide phase content up to 70-97 % in cemented carbides [9], researchers have drawn different conclusions about whether cyclic fatigue or static fatigue plays a dominant role in the fatigue damage of these materials.…”

Section: Introductionmentioning

confidence: 99%

Investigation on the Static Fatigue Mechanism and Effect of Specimen Thickness on the Static Fatigue Lifetime in WC–Co Cemented Carbides

Ding

Liang

Chen

et al. 2018

J. Superhard Mater.

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Investigation on the static fatigue mechanism and effect of specimen thickness on the static fatigue lifetime in WC-Co cemented carbides The static fatigue mechanism and effect of specimen thickness on static fatigue lifetime for four WC-Co cemented carbides were studied with different binder contents and carbide grain sizes. Static fatigue tests under three-point bend loading were conducted on different sized specimens. The fracture surfaces of rupture specimens were examined by scanning electron microscopy to investigate the static fatigue micromechanisms. Experimental results show that microcracks nucleate from defects or inhomogeneities and the connection of microcracks produces a main crack. The main crack propagates rapidly, resulting in the fracture of specimens. The extension of static fatigue lifetime with the increase of specimen thickness is due to the decrease of plastic zone size near the crack tip and relevant energy change during the crack growth. The effect of specimen thickness on static fatigue lifetime is much greater for cemented carbides with larger WC grain size or higher cobalt content, which is attributed to operative toughening mechanisms.

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Effect of stress ratio on fatigue lifetime and crack growth behavior of WC–Co cemented carbide

Cited by 19 publications

References 15 publications

Study on the Fatigue Crack Initiation and Growth Behavior in Bismuth- and Lead-Based Free-Cutting Brasses

Study on the Fatigue Crack Initiation and Growth Behavior in Bismuth- and Lead-Based Free-Cutting Brasses

A Review on Fatigue Mechanisms and Approaches for Hard metals

Investigation on the Static Fatigue Mechanism and Effect of Specimen Thickness on the Static Fatigue Lifetime in WC–Co Cemented Carbides

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