Effects of Boron Content on the Microstructure and Impact Toughness of 12Cr1MoVR Low-Alloy Heat-Resistant Steel Weld Metals

Dou, Guishan; Cao, Rui; Cai, Changliang; Cheng, Han; Guo, Xili; Jiang, Yong; Chen, Jianhong

doi:10.3390/ma14040926

Cited by 5 publications

(4 citation statements)

References 25 publications

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“…According to the strong effect of this element on the steel hardenability, the considered segregations stabilize the crystal lattice of austenite and hence should also hinder the formation of its DR embryos. Specifically, boron atoms concentrated at grain boundaries reduce migratory mobility of the latter and thus should decelerate their local bulging that is an important mechanism of the DR nucleation [10]. However, intensification of the work hardening at higher strain rates of the steel with boron (Fig.…”

Section: Discussionmentioning

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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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: Discussionmentioning

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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“…The addition of Dy can increase the secondary phase and the lattice expansion leading to deformation, the Young's coefficient is increased, the magnetostrictive strain is decreased, and the Curie temperature is increased which means that the thermal stability is increased [9]. Furthermore, Dy and B can be added to improve physical characteristics and magnetic exchange-coupling strength [10][11][12][13]. For these reasons, it is critical to investigate the addition of a third or fourth element.…”

Section: Introductionmentioning

confidence: 99%

Thickness, Annealing, and Surface Roughness Effect on Magnetic and Significant Properties of Co40Fe40B10Dy10 Thin Films

Liu,

Chang,

Chiang

et al. 2023

Materials

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In this study, Co40Fe40B10Dy10 thin films were deposited using a direct current (DC) magnetron sputtering technique. The films were deposited on glass substrates with thicknesses of 10, 20, 30, 40, and 50 nm, and heat-treated in a vacuum annealing furnace at 100, 200, and 300 °C. Various instruments were used to examine and analyze the effects of roughness on the magnetic, adhesive, and mechanical properties. From the low frequency alternating current magnetic susceptibility (χac) results, the optimum resonance frequency is 50 Hz, and the maximum χac value tends to increase with the increase in the thicknesses and annealing temperatures. The maximum χac value is 0.18 at a film thickness of 50 nm and an annealing temperature of 300 °C. From the four-point probe, it is found that the resistivity and sheet resistance values decrease with the increase in film deposition thicknesses and higher annealing temperatures. From the magnetic force microscopy (MFM), the stripe-like magnetic domain distribution is more obvious with the increase in annealing temperature. According to the contact angle data, at the same annealing temperature, the contact angle decreases as the thickness increases due to changes in surface morphology. The maximal surface energy value at 300 °C is 34.71 mJ/mm2. The transmittance decreases with increasing film thickness, while the absorption intensity is inversely proportional to the transmittance, implying that the thickness effect suppresses the photon signal. Smoother roughness has less domain pinning, more carrier conductivity, and less light scattering, resulting in superior magnetic, electrical, adhesive, and optical performance.

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“…Material properties have a vital role for the selection of material and the life of a component. During the welding process of welded joints, the material properties of different components are significantly changed by temperature variations, resulting in small cracks [ 1 , 2 , 3 ]. Under the action of an external load, these small cracks would try to expand, resulting in the failure of the welded joints.…”

Section: Introductionmentioning

confidence: 99%

Effect of Yield Strength Distribution Welded Joint on Crack Propagation Path and Crack Mechanical Tip Field

Bi¹,

Yuan

Lv³

et al. 2021

Materials

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Due to the particularity of welding processes, the mechanical properties of welded joint materials, especially the yield strength, are unevenly distributed, and there are also a large number of micro cracks, which seriously affects the safety performance of welded joints. In this study, to analyze the effect of the uneven distribution of yield strength on the crack propagation path of welded joints, other mechanical properties and residual stresses of welded joints are ignored. In the ABAQUS 6.14 finite element software, the user-defined field (USDFLD) subroutine is used to define the unevenly distributed yield strength, and extended finite element (XFEM) is used to simulate crack propagation. In addition, the static crack finite element model of the welded joint model is established according to the crack propagation path, which is given the static crack model constant stress intensity factor load, and the influence of an uneven yield strength distribution on mechanical field is analyzed. The results show that the crack length of welded joints as well as the plastic deformation range of the crack tip in high stress areas can be reduced with the increase of yield strength along the crack propagation direction. Moreover, the crack deflects to the low yield strength side. This study provides an analytical reference for the crack path prediction of welded joints.

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Effects of Boron Content on the Microstructure and Impact Toughness of 12Cr1MoVR Low-Alloy Heat-Resistant Steel Weld Metals

Cited by 5 publications

References 25 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

Thickness, Annealing, and Surface Roughness Effect on Magnetic and Significant Properties of Co40Fe40B10Dy10 Thin Films

Effect of Yield Strength Distribution Welded Joint on Crack Propagation Path and Crack Mechanical Tip Field

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