Low-temperature tensile ductility by V-alloying of high-nitrogen CrMn and CrNiMn steels: Characterization of deformation microstructure and fracture micromechanisms

Астафурова, Е. Г.; Moskvina, Valentina; Maier, Galina; Гордиенко, А. И.; Burlachenko, A. G.; Smirnov, A. I.; Батаев, В. А.; Galchenko, N. K.; Астафуров, С. В.

doi:10.1016/j.msea.2018.12.107

Cited by 23 publications

(17 citation statements)

References 47 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…These coarse particles are peculiar for V-HNSs, and they do not dissolve during solid-solution treatment [25][26][27]. The details on the elemental composition of these V-based nitrides are described previously in [27]. The most characteristic particle sizes lied in the interval 300-400 nm; their volume fraction was 1.5%.…”

Section: Methodsmentioning

confidence: 81%

“…The average grain size was 94 µ m. Steel microstructure also contained large particles of vanadium-based nitrides/carbonitrides, which were homogeneously distributed both in grain bodies and along grain boundaries. These coarse particles are peculiar for V-HNSs, and they do not dissolve during solid-solution treatment [25][26][27]. The details on the elemental composition of these V-based nitrides are described previously in [27].…”

Section: Methodsmentioning

confidence: 97%

“…During high-temperature tensile deformation in a temperature interval from 850 to 1000 • C and strain-rate range from 4 × 10 −4 s −1 to 6 × 10 −3 s −1 , this microstructure demonstrated the characteristics of superplastic flow: elongation in the interval 400-900%, strain-rate sensitivity exponent m = 0.40-0.49, grain boundary sliding mechanism. The maximum elongation to failure (900%) was reached at deformation temperature 950 • C and strain rate 4 × 10 −4 s −1 .precipitation hardening [24][25][26][27]. Despite the visible advantages of the high-nitrogen austenitic steels as a construction material, there is limited data related to the possibility of realization of superplastic flow in them.…”

mentioning

confidence: 99%

“…precipitation hardening [24][25][26][27]. Despite the visible advantages of the high-nitrogen austenitic steels as a construction material, there is limited data related to the possibility of realization of superplastic flow in them.…”

mentioning

confidence: 99%

See 3 more Smart Citations

On the Superplastic Deformation in Vanadium-Alloyed High-Nitrogen Steel

Астафурова¹,

Moskvina²,

Panchenko³

et al. 2019

Metals

View full text Add to dashboard Cite

The experimental evidence for the realization of a superplastic behavior with 900% elongation in V-alloyed high-nitrogen austenitic Fe-19Cr-22Mn-1.5V-0.3C-0.6N steel was proposed. Using thermomechanical processing, a misoriented grain/subgrain austenitic microstructure with a high density of deformation-assisted defects and precipitates was developed in the steel. During high-temperature tensile deformation in a temperature interval from 850 to 1000 • C and strain-rate range from 4 × 10 −4 s −1 to 6 × 10 −3 s −1 , this microstructure demonstrated the characteristics of superplastic flow: elongation in the interval 400-900%, strain-rate sensitivity exponent m = 0.40-0.49, grain boundary sliding mechanism. The maximum elongation to failure (900%) was reached at deformation temperature 950 • C and strain rate 4 × 10 −4 s −1 .precipitation hardening [24][25][26][27]. Despite the visible advantages of the high-nitrogen austenitic steels as a construction material, there is limited data related to the possibility of realization of superplastic flow in them. Padmanabhan [1] mentioned a result of N. Narkevich, who reported 239% elongation in Fe-20Cr-20Mn-4.7V-1.14N (mass.%) steel tested at temperature 950 • C and strain-rate 4.6 × 10 −4 s −1 . Such relatively high elongation was obtained for the steel after a solid-solution treatment followed by 50% cold-rolling and age-hardening at 700 • C for 1 h. The microstructure of the steel during high-temperature tests, probably, was not strictly single-phase austenitic but also contained Cr-based and V-based nitrides. This result lied in line with those for single-phase austenitic stainless steels, in which the superplastic-assisted elongation does not exceed 280% [1,28]. Mineura [29] reported much higher elongation (527%) for Fe-20Cr-10Ni-0.7N (mass.%) steel at temperature 800 • C and strain rate 8 × 10 −4 s −1 . They used two-step cold rolling with intermediate anneal at 1000 • C for obtaining fine-grained austenitic structure stabilized by fine chromium nitrides. Vanadium-alloying promotes a homogeneous (continuous) reaction of precipitate hardening in austenitic CrMn steels [24], and this fact could provide higher stability of the fine-grained structure during high-temperature tests as compared to chromium nitrides. Therefore, there is a potential for improvement of the values for the superplastic elongation obtained by Mineura [29].This paper aimed to find out the superplastic characteristics in high-nitrogen V-alloyed austenitic steel Fe-19Cr-22Mn-1.5V-0.3C-0.6N (mass.%).

show abstract

Section: Methodsmentioning

confidence: 81%

Section: Methodsmentioning

confidence: 97%

mentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

On the Superplastic Deformation in Vanadium-Alloyed High-Nitrogen Steel

Астафурова¹,

Moskvina²,

Panchenko³

et al. 2019

Metals

View full text Add to dashboard Cite

show abstract

“…Большое влияние на механическое поведение и свойства указанных сталей оказывает азот, находящийся в твердом растворе. Аустенитные нержавеющие стали с азотом при пониженных температурах, обладают высокими прочностными характеристиками, повышенной износостойкостью и высокой пластичностью [6][7][8][9].…”

unclassified

STRUKTURNO-FAZOVYE PREVRAShchENIYa V METASTABIL''NOY AUSTENITNOY STALI PRI PROKATKE I TRENII

2020

Mezhdunarodnaya Konferentsiya "Fizicheskaya Mezomekhanika. Materialy S Mnogourovnevoy Ierarkhicheski Organizovannoy Strukturoy

View full text Add to dashboard Cite

Effect of Reheating Temperatures on Hot Ductility and Precipitation Behavior of Low‐Carbon Steels

Sadeghi

Zargar

Lahino

et al. 2022

steel research int.

View full text Add to dashboard Cite

The influence of reheating temperatures on hot ductility is investigated in two Ni‐, Mo‐, and Cu‐containing low‐carbon steels. The effects of solution treatment conditions at 1623, 1673 K, and remelting at 1803 K on the reduction in area (RA) are analyzed. The results show an RA trough in the range of 973–1173 K in all experimental conditions. At 973 K, which is close to the Ae3 temperature of both steel grades, ductility drop is caused by the formation of the thin ferrite film at the prior austenite grain boundary. Higher RA values are achieved after reheating to 1623 K, mainly due to smaller austenite grain size by the action of preformed precipitation throughout the matrix. In contrast, increased reheating temperatures result in relatively poor RA values because of the large austenite grain size due to the dissolution of preformed precipitate and reprecipitation at the grain boundaries during cooling. A comparison between two steel grades shows that better ductility at 973 K is achieved in low Ni‐containing steel due to the relatively thick ferrite film. The effects of alloy composition and preformed precipitate's existence on hot ductility are further discussed based on the matrix strengthening and reprecipitation behavior.

show abstract

Low-temperature tensile ductility by V-alloying of high-nitrogen CrMn and CrNiMn steels: Characterization of deformation microstructure and fracture micromechanisms

Cited by 23 publications

References 47 publications

On the Superplastic Deformation in Vanadium-Alloyed High-Nitrogen Steel

On the Superplastic Deformation in Vanadium-Alloyed High-Nitrogen Steel

STRUKTURNO-FAZOVYE PREVRAShchENIYa V METASTABIL''NOY AUSTENITNOY STALI PRI PROKATKE I TRENII

Effect of Reheating Temperatures on Hot Ductility and Precipitation Behavior of Low‐Carbon Steels

Contact Info

Product

Resources

About