Influence of Strength on Susceptibility to Embrittlement of Steels under Action of Stress Raisers

Gryshchenko, V. M.; Meshkov, Yu. Ya.; Polushkin, Yu. O.; Shiyan, A. V.

doi:10.15407/mfint.37.07.0961

Cited by 16 publications

(4 citation statements)

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“…This technology's advantage is the high saturation rate, uniformity of heating and saturation in the melt, increased wear resistance and corrosion resistance of the surface, reduction of the friction coefficient by 1.5 -5.0 times, and environmental friendliness and non-toxicity of cyanate salts. The process is carried out at a temperature of 540-600 °C, dwell time 4-6 hours, and layer thickness 0.12-0.3 mm [13].…”

Section: Methodsmentioning

confidence: 99%

Carbonitration of a Tool for Pressing Stainless Steel Pipes

Иванов

Mohylenets²,

Dumenko³

et al. 2020

JES

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To upgrade the operational stability of the tool at LLC “Karbaz”, Sumy, Ukraine, carbonation of tools and samples for research in melts of salts of cyanates and carbonates of alkali metals at 570–580 °C was carried out to obtain a layer thickness of 0.15–0.25 mm and a hardness of 1000–1150 НV. Tests of the tool in real operating conditions were carried out at the press station at LLC “VO Oscar”, Dnipro, Ukraine. The purpose of the test is to evaluate the feasibility of carbonitriding of thermo-strengthened matrix rings and needle-mandrels to improve their stability, hardness, heat resistance, and endurance. If the stability of matrix rings after conventional heat setting varies around 4–6 presses, the rings additionally subjected to chemical-thermal treatment (carbonitration) demonstrated the stability of 7–9 presses due to higher hardness, heat resistance, the formation of a special structure on the surface due to carbonitration in salt melts cyanates and carbonates. Nitrogen and carbon present in the carbonitrided layer slowed down the processes of transformation of solid solutions and coagulation of carbonitride phases. The high hardness of the carbonitrified layer is maintained up to temperatures above 650 °C. If the stability of the needle-mandrels after conventional heat treatment varies between 50–80 presses, the needles, additionally subjected to chemical-thermal treatment (carbonitration) showed the stability of 100–130 presses due to higher hardness, wear resistance, heat resistance, the formation of a special surface structure due to carbonitration in melts of salts of cyanates and carbonates. Keywords: needle-mandrel, matrix ring, pressing, heat treatment, carbonitration.

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Section: Methodsmentioning

confidence: 99%

Carbonitration of a Tool for Pressing Stainless Steel Pipes

Иванов

Mohylenets²,

Dumenko³

et al. 2020

JES

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“…An approach to this problem was developed in [7]: instead of the plasticity ψ cr , the protection against embrittlement for a sample with a cut may be assessed by means of the strain resistance B r , which corresponds to the plasticity and the strain hardening of the metal (3) Here S cr is the true failure stress at the neck of the sample in tensile tests.…”

Section: Optimizing the Carrying Capacity Of Products With A Cutmentioning

confidence: 99%

“…In experiments using cylindrical samples with annular cuts, instead of the plasticity ψ cr , the strain resistance B r was employed [3,4]. We know that B r depends much less than the plasticity characteristics ψ cr , δ 5 , and δ 10 or the impact strength KCV on the type of sample [3]. In other words, it is a more general characteristic of the plastic properties.…”

Section: Minimum Mechanical Reliability Of a Product With A Stress Concentratormentioning

confidence: 99%

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Optimizing the Strength and Plasticity of Steel Parts with Stress Concentrators

Meshkov

Shiyan

2018

Steel Transl.

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A new approach is proposed to preventing the brittle failure of steel parts and structural elements associated with embrittlement by stress concentrators such as cracks. This approach applies when alloys with insufficient margin of plasticity are used. The strength of parts with stress concentrators may be ensured by optimizing their strength and plasticity so as to maintain ductile failure in the given stress-strain state. The mechanical properties of the optimized metal are calculated on the basis of the correlations established in tests of standard samples and tests of parts with the specified stress-strain state.

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