Influence of oxygen concentration on the formation features and thermal stability of the V–Cr–W–Zr alloy microstructure under combined treatment conditions

Дитенберг, И. А.; Смирнов, И. В.; Grinyaev, K. V.; Tyumentsev, А. N.

doi:10.1016/j.matchar.2020.110517

Cited by 7 publications

(7 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…CHT with the method of nonequilibrium internal oxidation, similarly to the works in [ 25 , 32 , 33 ], consisted of two stages: (1) formation of a surface scale during annealing in air at 650 °C for 5 to 30 min; and (2) vacuum annealing with a total duration of 9 h, with a stepwise increase in temperature from 620 to 1000 °C, to transfer oxygen from the surface scale into the sample.…”

Section: Methodsmentioning

confidence: 99%

“…One of the main requirements of vanadium alloys as structural materials is the combination of high-temperature strength and low-temperature ductility. In accordance with modern physical concepts, the main mechanisms of strengthening of heterophase alloys at low temperatures are deformation, solid solution, and dispersion [ 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 ]. In turn, the provision of high-temperature strength (at T ≥ 0.6 T melt ) is realized through dispersion strengthening, the improvement of the efficiency of which requires optimization of the elemental and phase composition.…”

Section: Introductionmentioning

confidence: 90%

“…In this case, the determining factor is the thermal stability of the nanosized particles of nonmetallic phases. With the joint implementation of dispersion plus substructural strengthening, such particles not only pin the dislocation substructure, but also effectively fix the boundaries of grains and subgrains, which leads to the suppression of recrystallization processes [ 24 , 25 ].…”

Section: Introductionmentioning

confidence: 99%

“…The authors of the works in [ 25 , 32 ] proposed vanadium alloys of the V–Me(Cr, W)–Zr–C system with purposeful alloying with interstitial (C, N, O) and substitutional (W, Zr) elements. The main phase-forming element of the alloys of such a system is Zr, which is characterized by a high chemical activity towards interstitial impurities (C, N, O).…”

Section: Introductionmentioning

confidence: 99%

“…It was found that when carbide strengthening was implemented in such systems, the strength properties at high temperatures increased by several tens of percent. In the case of using CHT, in addition to a large increase in the high-temperature strength, the thermal stability of the alloys increased by 100–300 degrees [ 24 , 25 ].…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Increasing the Thermal Stability and High-Temperature Strength of Vanadium Alloys by Strengthening with Nanosized Non-Metallic Particles

et al. 2023

Self Cite

View full text Add to dashboard Cite

Using the methods of scanning and transmission electron microscopy, the features of the structural-phase state of a vanadium alloy of the V–Cr–Ta–Zr system after a combined treatment, which consisted in cyclic alternation of thermomechanical and chemical-heat treatments, were studied. The values of yield strength and ductility of the V–Cr–Ta–Zr alloy were determined, depending on the stabilization and test temperatures. It was established that, after the combined treatment, the structural-phase state of the V–Cr–Ta–Zr alloy was composite, in which the joint implementation of dispersion and substructural strengthening ensured the formation of a gradient grain structure with a polygonal state, the elements of which were fixed by nanosized ZrO2 particles characterized by a high thermal stability. Such modification of the microstructure was accompanied by an increase in the high-temperature strength and a shift in the upper limit of the temperature stability interval towards high temperatures, of up to 900 °C. It was assumed that the polygonal state inside the grains contributed to the implementation of cooperative mechanisms of the dislocation–disclination type, which ensured the accommodation of the material in the “high-strength state” under loading.

show abstract

Section: Methodsmentioning

confidence: 99%