Structural sensitivity of steels to corrosion-mechanical fracture under conditions of fatigue and cavitation

Tsyrulnyk, Oleksandr; Bassarab, A. I.

doi:10.1007/bf02365757

Cited by 8 publications

(2 citation statements)

References 3 publications

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“…This specificity of fatigue destruction leads to a decrease in the limit of fatigue with increasing perlite content. the results obtained in the study are in good agreement with the works [23][24][25]. Similar mechanisms of fatigue and corrosion-fatigue fracture are observed in tubular steels of such chemical composition [26][27][28][29][30] under difficult operating conditions [31][32].…”

Section: Resultssupporting

confidence: 88%

Corrosion-fatigue failure of tractor trailers metal materials in aggressive environments

Popovych

Poberezhny

Шевчук

et al. 2020

Koroze a Ochrana Materialu

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The processes of corrosion-fatigue failure of materials in contact with mineral fertilizers are insufficiently studied. As a result of joint influence of atmospheric corrosion and mechanical loads, about 70 to 80 % of machine parts get out of order, 20 to 25 % of which are failures caused by operating overload due to the strength loss because of atmospheric corrosion. A large part of metal structures of agricultural vehicles used to transport mineral fertilizers is under the direct influence of aggressive environments and dynamic loads that occur during the motion by field roads. Saturated solutions of the most aggressive working environments used in agricultural production, in particular ammonium sulphate and nitrophosphate are investigated to reduce fatigue resistance of ordinary steels groups – St3 and St5 and quality steels – 10 Steel, 15 Steel, 20 Steel, 25 Steel when loaded at all levels. The fatigue endurance limit decreases in comparison with air up to 2.02 times in a solution of ammonium sulphate, and to 2.32 times in a solution of nitrophosphate. In organic fertilizer environments, compared to distilled water, the conditional fatigue endurance limit increased to 9 %. The properties of the given materials as an inhibitor of corrosion-fatigue failure were discovered and proved.

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Section: Resultssupporting

confidence: 88%

Corrosion-fatigue failure of tractor trailers metal materials in aggressive environments

Popovych

Poberezhny

Шевчук

et al. 2020

Koroze a Ochrana Materialu

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“…The greatest tendency to corrosion-mechanical fracture of high-strength low-alloy steels is observed in conditions of long-term static loading at temperatures close to room temperature and is determined by the following main factors [5][6][7][8][9][10][11]: the structural state and chemical composition of steel, the level of residual local micro-stresses, the aggressiveness of the corrosive medium, etc. Taking into account these factors is an actual scientific problem related to the variety of approaches to the study of the process of corrosion-mechanical fracture and a small number of standardized methods of corrosion-mechanical tests.…”

Section: Introductionmentioning

confidence: 99%

On the Influence of Internal and External Factors on the Processes of Corrosion-Mechanical Fracture of High-Strength Low-Alloy Steels

et al. 2021

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The article studies the influence of internal and external factors on the process of corrosion-mechanical fracture. It is shown that depending on the conditions of hydrogen charging (temperature and chemical composition of the corrosive medium, type of polarization), the mechanical properties of low-alloy steels change dramatically during the initial period of the experiment. With further increase in the holding time in a corrosive medium without polarization, there is no significant change in mechanical properties. It was found that an increase in the level of applied tensile stresses leads to a reduction in the incubation period of microcracks during hydrogen cracking. It was found that the sensitivity of low alloy steels to cracking is largely determined by the relaxation ability of the structure-the relaxation of residual peak micro-stresses localized at the grain boundaries and substructure boundaries reduces the sensitivity to corrosion-mechanical fracture.

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Longevity of tungsten-cobalt alloys under load in a corrosive environment

Bassarab¹,

Vasyliv²,

Ivasyshyn³

et al. 1999

Mater Sci

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We studied the influence of the chemical composition of the WC-Co cermet system on the operating characteristics of hard-alloy tips of drill bits manufactured from it. We established that the cyclic contact strength of tips in air at room temperature and the threshold range of the stress intensity factor in the tip material increase with the cobalt content. Using the results of tests of the materials for cyclic crack resistance, as well as of cavitation-erosion and electrochemical tests in 3% NaCI aqueous solutions, we ascertained that the optimum corrosion and mechanical characteristics correspond to the composition containing 8 mass% Co. We noticed a significant contribution of the anodic dissolution of the Co-phase and its hydrogen embrittlement in the process of corrosive-mechanical damage of hard alloys. We discovered a satisfactory correlation between the parameters of cyclic contact strength, threshold range of the stress intensity factor, and steady-state rate of cavitation-erosion failure of WC--Co hard alloys. This fact demonstrates the possibility to use these parameters as reliable and interchangeable criteria of the operational reliability of hard-alloy products.Cermet tungsten-cobalt alloys of WC-Co system are widely used for the manufacture of tools which are used in the mining, oil, and gas industries and also for metal machining. During operation, products made of cermet tungsten--cobalt alloys are subject to the influence of various kinds of mechanical loads often in the presence of a chemically active environment, which results in their damage, wear, and failure, e.g., failure in consequence of contact fatigue, hydroabrasive erosion, or cavitation-erosion failure. To intensity the processes of machining of articles and products and of rock mining, one successfully applies technological solutions with various degrees of corrosivity. Therefore, investigations of the characteristics of resistance of cermet tungsten-cobalt alloys to corrosive-mechanical failure depending on the combined action of the environment and mechanical factors are becoming very urgent. From this viewpoint, in particular, the behavior of cermet tungsten-cobalt alloys under the influence of cavitation is interesting. In this case, intensive cyclic loading in a domain commensurable with the structural components of the material occurs. Investigations of this problem are well known [1 ] but they did not deal with the effect of the amount of the cobalt phase in materials with identical parameters of structural elements on the behavior of cermet tungsten--cobalt alloys. Moreover, a sufficiently wide spectrum of loading conditions has not been considered.The present work investigates the influence of a corrosive environment on the characteristics of resistance of WC-Co cermet compositions with different ratios between the metallic and ceramic phases to mechanical damage and failure under different kinds of loading and searches for a criterion which would characterize the kinetics of damage of the structure of material under certai...

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Structural sensitivity of steels to corrosion-mechanical fracture under conditions of fatigue and cavitation

Cited by 8 publications

References 3 publications

Corrosion-fatigue failure of tractor trailers metal materials in aggressive environments

Corrosion-fatigue failure of tractor trailers metal materials in aggressive environments

On the Influence of Internal and External Factors on the Processes of Corrosion-Mechanical Fracture of High-Strength Low-Alloy Steels

Longevity of tungsten-cobalt alloys under load in a corrosive environment

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