Stress corrosion cracking of a 6% cobalt/ tungsten carbide hard metal

Almond, E. A.; May, A.T.; Roebuck, B

doi:10.1007/bf00540937

Cited by 10 publications

(3 citation statements)

References 4 publications

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“…The un‐aged sample appears ideal (Figure A). As in previous observations, the dominant features on aging are the appearance of lateral crack chips (predominantly upper left) and the dissolution of the contact impression (primarily along the shear faults). Both of these features decrease the residual field, leading to a closing of the surface traces of the half‐penny cracks (barely visible in Figure B and C) and are consistent with an increase in strength at long exposure times.…”

Section: Resultssupporting

confidence: 72%

“…These results, although extremely important for brittle material reliability predictions, reflect strength measurements under different circumstances and so it is useful to be clear about the phenomenology observed, here and elsewhere: Exposure to a weakly corroding or reactive environment, zero‐stress aging in H 2 O, prior to an inert strength test (Figure B) did not have a significant effect on the inert strength (Figures 4, 8, 10, 12) of any material. The small strength increases probably reflected saturating lateral crack growth and related residual field decreases, observed previously . The strength increases measured in abraded samples probably also reflected less‐easily observed residual field decreases. Exposure to a weakly corroding environment during an increasing stress test in H 2 O (Figure C) led to a significant decrease in reactive strength (Figures 4, 8, 10, 12).…”

Section: Discussionsupporting

confidence: 60%

“…Hence, to exacerbate the effects of corrosion on the strength of brittle materials, a moderately corrosive environment, an aqueous HF solution, was used here in the chemical exposure steps B(2) and C(2). A similar HF solution was used previously on soda‐lime silicate glass (SLG) for a similar purpose, (in buffered or modified form) on silicon, and also (in vapor form) on tungsten carbide‐cobalt . The words strong, moderate, and weak are used here in a particular way: A strongly corrosive environment is one that removes (say, by dissolution) material from a flat, flaw‐free surface .…”

Section: Introductionmentioning

confidence: 99%

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Strength of brittle materials in moderately corrosive environments

Cook

2017

J Am Ceram Soc

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The strengths of four brittle materials-cordierite glass ceramic, fused silica, silicon, and polycrystalline alumina were measured after exposure to weakly corrosive water and moderately corrosive buffered HF (BHF) solution. Exposure to water did not alter the strengths in subsequent inert strength tests and decreased the strengths in reactive strength tests. Exposure to BHF increased the strengths in both tests, but only after an incubation exposure time. Prior to the incubation time, the BHF had the same effect as water, suggesting that the bond rupture kinetics were unaffected.Examination of strength-controlling indentation flaws after the incubation time showed clear corrosive effects on the flaw geometry indicative of reductions in the indentation residual stress fields. The implication is that moderately corrosive environments increase the strength or lifetime of a brittle component by reducing the crack driving force via flaw alteration and do not, as perhaps expected, decrease the strength or lifetime through enhanced chemical reactivity.

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Section: Resultssupporting

confidence: 72%

Section: Discussionsupporting

confidence: 60%

Section: Introductionmentioning

confidence: 99%

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Strength of brittle materials in moderately corrosive environments

Cook

2017

J Am Ceram Soc

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Tungsten Carbides

Shabalin

2022

Ultra-High Temperature Materials IV

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Fatigue crack growth of WC–Co cemented carbides: a comparative study using small indentation flaws and long through-thickness cracks

Mahani,

Liu,

García-Marro

et al. 2024

Int J Fract

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The fatigue crack growth behavior of a submicron-grained WC–Co hardmetal is investigated by artificially introducing small flaws by means of sharp indentation. Similar fatigue testing is also conducted on notched specimens with long through-thickness cracks for comparison purposes. The use of controlled small indentations flaws is shown to be a valid and successful approach for studying and describing crack growth behavior under cyclic loading for the material under consideration. This statement is based on the similitude found in fatigue mechanics and mechanisms between both crack types. Regarding the former, accounting of the indentation-induced residual stresses is key to rationalize the experimental findings. Concerning the latter, inspection of crack-microstructure interaction as well as fracture surfaces permit to discern similar features and scenarios, at both meso- and micrometric length scales. Results from this research yield an immediate practical implication, as indentation techniques may then be proposed as an alternative testing route for investigating fatigue crack growth behavior of hardmetal grades where sharp indentation is capable to induce well-developed radial crack systems.

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Stress corrosion cracking of a 6% cobalt/ tungsten carbide hard metal

Cited by 10 publications

References 4 publications

Strength of brittle materials in moderately corrosive environments

Strength of brittle materials in moderately corrosive environments

Tungsten Carbides

Fatigue crack growth of WC–Co cemented carbides: a comparative study using small indentation flaws and long through-thickness cracks

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