Anomalous Refinement of the Austenite Grain upon High-Strain-Rate Hot Deformation of Microalloyed Medium-Carbon Steel

Knyazyuk, T. V.; Zisman, A. A.; Novoskoltsev, N. S.; Хлусова, Е. И.

doi:10.1134/s0031918x20060095

Cited by 4 publications

(2 citation statements)

References 7 publications

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“…The second material is low carbon steel, whereas the third and fourth ones are medium carbon steels. The last of them, recently developed for agricultural applications [22], is alloyed by boron and displays abnormal properties as considered in the present work.…”

Section: Methodsmentioning

confidence: 99%

“…The present work has been motivated by our previous results [22] indicating an abnormal temperature dependence of the threshold strain that triggers the dynamic recrystallization (DR) of austenite in a medium carbon steel alloyed by boron and hot deformed at strain rates up to 100 s −1 . Unlike the expected behavior, neither diminishing temperature nor increasing strain rate resulted in the growth of this characteristic.…”

Section: Introductionmentioning

confidence: 99%

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Abnormal effect of strain rate on dynamic recrystallization of austenite in medium carbon steel alloyed by boron

Князюк

Zisman

2022

Lett. Mater.

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According to literature data confirmed by our experiments on various steels, the strain degree that triggers the dynamic recrystallization of austenite in high-temperature deformation increases with the strain rate. However, as shown in the present work, micro-alloying of medium carbon steel by boron results in the opposite dependence in the strain rate range of 1 to 100 s −1 . The corresponding features of stress-strain diagrams comply with the former austenite structures revealed by chemical etching. A specific effect of boron is discussed with allowance for its segregations at grain boundaries where the recrystallization embryos form. Such segregations hinder rearrangement of atoms involved in the grain boundary migration and hence decelerate their bulging necessary to nucleate recrystallization origins. Similar to the known "yield tooth" effect, very strong strain hardening of the steel with boron eventually enables the boundaries to free from the segregated atoms and begin the dynamic recrystallization at relatively low strain degrees. The obtained results indicate that the considered phenomenon is not due to the ultimate strain rate as such but results from its combination with the boron alloying. The revealed regularities gain in significance for evident reasons. First, they enhance ductility of high-strength steels hot deformed with very high strain rates as, for instance, in case of hammering. Second, such treatments notably refine the austenite structure and, correspondingly, improve the transformed structure and final mechanical properties after steel quenching.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Abnormal effect of strain rate on dynamic recrystallization of austenite in medium carbon steel alloyed by boron

Князюк

Zisman

2022

Lett. Mater.

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Effect of annealing temperature and time on recrystallization behavior of Mg-Gd-Y-Zn-Zr alloy

Han

Jia

Zhang

et al. 2021

Mater. Res. Express

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In this paper, the effect of annealing treatment on the microstructure and hardness of extruded Mg-9Gd-4Y-2Zn-0.5Zr alloy (wt. %) was discussed. The microstructure evolution of the alloy under different annealing conditions was studied by optical microscope (OM), scanning electron microscopy (SEM) and electron backscatter diffraction (EBSD), and the variation of hardness was analyzed. With the increase of annealing temperature, the large deformed grains first break into small recrystallized grains. When the temperature continues to increase, the recrystallized grains grow abnormally with the precipitation of chain phase and the fragmentation of lamellar long-period stacking ordered (LPSO) phase. The alloy does not recrystallize at low temperature, and the recrystallize grains grow abnormally at high temperature. The increase of annealing time will also lead to abnormal growth of recrystallized grains. The texture gradually diffuses from the classical extrusion texture to the extrusion direction (ED). The results show that under the condition of 430 °C × 5 h, the recrystallization volume of the alloy is the largest, the recrystallization grain distribution is uniform, and the hardness value is the highest.

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Rate-Dependent Compressive Behaviour of SiC−B4C−Al Hybrid Composites

Tulsi Chouhan,

Manoj Soni

2023

Phys. Metals Metallogr.

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Anomalous Refinement of the Austenite Grain upon High-Strain-Rate Hot Deformation of Microalloyed Medium-Carbon Steel

Cited by 4 publications

References 7 publications

Abnormal effect of strain rate on dynamic recrystallization of austenite in medium carbon steel alloyed by boron

Abnormal effect of strain rate on dynamic recrystallization of austenite in medium carbon steel alloyed by boron

Effect of annealing temperature and time on recrystallization behavior of Mg-Gd-Y-Zn-Zr alloy

Rate-Dependent Compressive Behaviour of SiC−B4C−Al Hybrid Composites

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