The influence of a corrosive wood-cutting environment on the mechanical properties of hardmetal tools

Pugsley, V.A.; Korn, G.; Luyckx, S.; Sockel, H. G.; Heinrich, W.; Wolf, Manfred; Feld, H.; Schulte, Robert

doi:10.1016/s0263-4368(01)00059-2

Cited by 44 publications

(49 citation statements)

References 5 publications

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“…Refs. [39,56,57]), and its strength is intimately associated with nature, size and geometry of such defects [2]. In this regard, one beneficial aspect of materials exhibiting R-curve behavior is that effective toughness level rises as the size of the flaw also increases [21].…”

Section: Analytical Assessment Of R-curve Behavior: Toughening Mechanicsmentioning

confidence: 99%

FIB/FESEM experimental and analytical assessment of R-curve behavior of WC–Co cemented carbides

Tarragó

Jiménez‐Piqué

Schneider

et al. 2015

Materials Science and Engineering: A

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Exceptional fracture toughness levels exhibited by WC-Co cemented carbides (hardmetals) are due mainly to toughening derived from plastic stretching of crack-bridging ductile enclaves. This takes place due to the development of a multiligament zone at the wake of cracks growing in a stable manner. As a result, hardmetals exhibit crack growth resistance (R-curve) behavior.In this work, the toughening mechanics and mechanisms of these materials are investigated by combining experimental and analytical approaches. Focused Ion Beam technique (FIB) and Field-Emission Scanning Electron Microscopy (FESEM) are implemented to obtain serial sectioning and imaging of crack-microstructure interaction in cracks arrested after stable extension under monotonic loading. The micrographs obtained provide experimental proof of the developing multiligament zone, including failure micromechanisms within individual bridging ligaments. Analytical assessment of the multiligament zone is then conducted on the basis of experimental information attained from FIB/FESEM images, and a model for the description of R-curve behavior of hardmetals is proposed. It was found that, due to the large stresses supported by the highly constrained and strongly bonded bridging ligaments, WC-Co cemented carbides exhibit quite steep but short R-curve behavior. Relevant strength and reliability attributes exhibited by hardmetals may then be rationalized on the basis of such toughening scenario.

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Section: Analytical Assessment Of R-curve Behavior: Toughening Mechanicsmentioning

confidence: 99%

FIB/FESEM experimental and analytical assessment of R-curve behavior of WC–Co cemented carbides

Tarragó

Jiménez‐Piqué

Schneider

et al. 2015

Materials Science and Engineering: A

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“…Refs. [7][8][9]). Similar to other brittle materials, tensile strength of cemented carbides depends on the size of the major flaw and exhibits wide scatter due to the variability associated with defect distribution.…”

Section: Introductionmentioning

confidence: 99%

Strength and reliability of WC-Co cemented carbides: Understanding microstructural effects on the basis of R-curve behavior and fractography

Tarragó

Coureaux

Torres

et al. 2018

International Journal of Refractory Metals and Hard Materials

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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 fractographic inspection. It is the aim of this study to evaluate the strength behavior of a series of experimental WC-Co grades on the basis of R-curve failure criteria. Results indicate that microstructural effects on the strength of hardmetals may be satisfactorily rationalized following the referred criterion.The analysis includes consideration of nature and distribution of fracture origins, found to be more diverse and wider respectively for the harder fine-grained grades. This experimental evidence, together with the fact that these hardmetals exhibit steeper rising R-curves than tougher coarse-grained ones, leads to lower reliability for the former. This investigation documents and validates the great relevance of R-curve behavior for optimizing the mechanical performance of WC-Co cemented carbides on the basis of microstructural design.

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“…It is particularly challenging to produce hardmetals that are resistant to oxidative environments. Aggressive oxidative environments are found for instance in the machining of green wooden parts [4,5]. Pugsley et al [4] have shown that machining of wood with high moisture content leads to a rapid degradation of the hardmetal.…”

Section: Introductionmentioning

confidence: 99%

“…Aggressive oxidative environments are found for instance in the machining of green wooden parts [4,5]. Pugsley et al [4] have shown that machining of wood with high moisture content leads to a rapid degradation of the hardmetal. The combination of the non-homogeneous multicomponent hardmetal cutting tool with water and the soluble substances in wood provides propitious conditions for electrochemical action [6].…”

Section: Introductionmentioning

confidence: 99%

“…However, as referred to in Ref. [4], the environments associated with wood-cutting applications are characterized by a high moisture content (especially in green wood machining), which can affect the strength of the hardmetals and considerably shorten the tool lifetime due to the corrosive nature of the organic substances present in wood extracts [36][37][38].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Influence of binder metal and surface treatment on the corrosion resistance of (W,Ti)C-based hardmetals

Barbatti

Sket

García³

et al. 2006

Surface and Coatings Technology

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The effect of a nitridation surface treatment on the microstructure and corrosion resistance of Co and Ni-binder (W,Ti)C-based hardmetals with additions of (Ta,Nb)C was investigated. Nitridation treatment produces a surface layer with a higher hard phase (Ti,Ta,Nb,W)(C,N) content. The near-surface layer thickness and microstructure are affected by the choice of binder (Co respectively Ni). The corrosion resistance of the hardmetals was characterized using linear sweep voltammetry. The microstructure of the hardmetals was determined before and after corrosive attack by optical microscopy and SEM. The results of the corrosion tests and microstructure analyses are interpreted in terms of the correlation between the hardmetal morphology and porosity and ion transport through the interface binder-electrolyte. The nitridation treatment of the hardmetals strongly increases the resistance to aggressive corrosion media for hardmetals both with Co and Ni-binder phase and thus may positively influence the hardmetal lifetime in cutting applications in chemically aggressive environments.

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The influence of a corrosive wood-cutting environment on the mechanical properties of hardmetal tools

Cited by 44 publications

References 5 publications

FIB/FESEM experimental and analytical assessment of R-curve behavior of WC–Co cemented carbides

FIB/FESEM experimental and analytical assessment of R-curve behavior of WC–Co cemented carbides

Strength and reliability of WC-Co cemented carbides: Understanding microstructural effects on the basis of R-curve behavior and fractography

Influence of binder metal and surface treatment on the corrosion resistance of (W,Ti)C-based hardmetals

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