Behavior of an Austenitic–Martensitic VNS9-Sh Sheet TRIP Steel during Static and Cyclic Deformation

Терентьев, В. Ф.; Prosvirnin, D. V.; Slizov, A. K.; Kobeleva, L. I.; Marchenkov, A. Yu.; Ашмарин, А. А.; Сиротинкин, В. П.

doi:10.1134/s0036029518040195

Cited by 2 publications

(5 citation statements)

References 2 publications

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“…3 the engineering stress-strain curves in the temperature range of 20 -200°C are presented (for completeness, curve 5 is reproduced from our earlier publication [13]). At a test temperature of 20°C (curve 1), beyond the yield point, as in a previous report, weak deformation hardening is observed [12]. The stress-strain curves at 20 and 50°C are very similar, but in the stress-strain curve for 50°C, deformation hardening is less evident (curve 2), which is suggestive of normal behavior with a rise in temperature.…”

Section: Resultssupporting

confidence: 80%

“…Control of temperature with accuracy ±5°C was ensured by a chromel-alumel thermocouple attached to the middle of the gauge length of the test specimen. As is well known, tests done at strain rates less than 10 s −1 are known as quasi-static tensile tests [12]. Microstructures of test sample fracture surfaces were investigated by SEM VEGA\\ SB (TESCAN).…”

Section: Experimental: Materials and Methodsmentioning

confidence: 99%

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Temperature dependence of the TRIP effect in a metastable austenitic stainless steel

Stolyarov¹,

Padmanabhan²,

Terentyev³

2019

LOM

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The effect of test temperature in the range 20-400°C on mechanical properties under quasi-static tension and phase composition in metastable austenite-martensite TRIP steel in the form of a sheet of 0.3 mm thickness is investigated. Here strength and ductility increases are caused by austenite to martensite phase transformation. As supplied, the steel contained 65 % martensite and 35 % austenite. Due to tensile testing at room temperature, the amount of martensite increases to 84 %, which leads to high strength (1600 MPa) and a relative elongation to failure of 20 %. There is no neck formation. With an increase in test temperature from room temperature to 400°C, the strength characteristics, especially yield strength, sharply decreases to 700 MPa and below. At the same time, the elongation to failure decreases by an order of magnitude to 2 %. Above a test temperature of 100°C, deformation localization begins, the length of the yield plateau on the stress-strain curve decreases, and then disappears. X-ray structural analysis of the sample surface after tension showed that the volume fraction of martensite in the microstructure decreases from 84 % at 20°C to 42 % at 400°C. With an increase in temperature in the range of 20-400°C the influence of the TRIP effect on the mechanical properties of austenitic steel gradually decreases, and the direct transformation of austenite to martensite eventually changes to the reverse transformation of martensite to austenite. It is assumed that the embrittlement of steel with increasing temperature is associated with inhomogeneous martensite decomposition and precipitation of fine carbides at grain boundaries.

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Section: Resultssupporting

confidence: 80%

Section: Experimental: Materials and Methodsmentioning

confidence: 99%

Temperature dependence of the TRIP effect in a metastable austenitic stainless steel

Stolyarov¹,

Padmanabhan²,

Terentyev³

2019

LOM

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“…Since TRIP steels are used in the most critical units and structures, this information is not sufficient for drawing conclusions concerning the durability of products made of this material. The authors of [24][25][26][27][28][29] considered the features of defor-mation for austenitic-martensitic VNS-9Sh grade TRIP steel (Table 1). In order to systematize the obtained data, the studies were carried out using samples of different shape.…”

Section: Connection Between Strength Parameters Under Static and Cyclic Loading By The Example Of Vns-9sh Grade Trip Steelmentioning

confidence: 99%

“…In [25], flat samples cut from sheet steel with a thickness of about 0.3 mm were tested under static and cyclic loading. The physicomechanical aspects of deformation of samples have been established.…”

Section: Connection Between Strength Parameters Under Static and Cyclic Loading By The Example Of Vns-9sh Grade Trip Steelmentioning

confidence: 99%

“…These results are associated with the fact that, in the case of a wire with a smaller diameter, owing to a higher reduction level upon drawing, the concentration of martensite in the bulk is higher, amounting to 35%, compared to an almost 100% content on the surface. So for a wire with a diameter of 0.36 mm tested under cyclic loading, the results are not beyond low- In the case of wires with a diameter of 0.95 mm, the authors of [25] have succeeded in determining the fatigue limit σ R = 400 MPa, which is more than a factor of two lower than that for the case of a flat sample.…”

Section: Connection Between Strength Parameters Under Static and Cyclic Loading By The Example Of Vns-9sh Grade Trip Steelmentioning

confidence: 99%

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Structural Features and Strength Behavior of TRIP/TWIP Steels

Prosvirnin

Larionov

Pivovarchik

et al. 2021

Inorg. Mater. Appl. Res.

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A review of the published data concerning the structural features of TRIP/TWIP steels, the relationship thereof to mechanical properties, and the relationship between strength parameters under static and cyclic loading is presented. It is shown that the level of mechanical properties of such steels is determined by the chemical composition and processing technology (thermal and thermomechanical processing, hot and cold pressure treatment), aimed at achieving a favorable phase composition. At the atomic level, the most important factor is represented by stacking fault energy, the level of which is decisive in the formation of austenite twins and/or in the formation of strain martensite. By choosing the chemical composition, one can set the level of stacking fault energy corresponding to the required mechanical characteristics. In the case of cyclic loading, an important role is played by the strain rate and the maximum load in the course of testing. So, at a high loading rate and a load approaching the yield strength under tension, the intensity of twinning processes and the rate of formation of martensite increases. It has been shown that one of the relevant ways to further improving the structural and functional properties of TRIP and TWIP steels consists in developing composite materials based on them. At present, surface modification and coating application, especially by means ion-vacuum methods, can be considered the most promising direction for making such composites.

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Behavior of an Austenitic–Martensitic VNS9-Sh Sheet TRIP Steel during Static and Cyclic Deformation

Cited by 2 publications

References 2 publications

Temperature dependence of the TRIP effect in a metastable austenitic stainless steel

Temperature dependence of the TRIP effect in a metastable austenitic stainless steel

Structural Features and Strength Behavior of TRIP/TWIP Steels

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