Study on the precipitation and coarsening of TiN inclusions in Ti-microalloyed steel by a modified coupling model

Gui, Lintao; Long, Mujun; Zhang, Haohao; Chen, Dengfu; Liu, Shuang; Wang, Qinzheng

doi:10.1016/j.jmrt.2020.03.075

Cited by 22 publications

(9 citation statements)

References 43 publications

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“…As mentioned above, Ti element clustered in these precipitates in steel S1 should be a residual element during steel-making. Research based on thermodynamic and kinetic theoretical analyses [13,19] shows that there is a considerable binding ability between Ti and N elements, and that there is a strong tendency to form TiN particles, even if the content of Ti element is It can be seen from Table 2 that almost all the precipitates in steel S1 are composed of Nb, V and Ti elements, although the contents of V and Ti elements usually have a relatively low value in these precipitates, even if there are three particles without Ti elements. Generally, the relative atomic weights of Nb, V and Ti elements are 92.9, 50.9 and 47.9, respectively.…”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Effect of Ti Addition on the Precipitation Mechanism and Precipitate Size in Nb-Microalloyed Steels

Jin

Zhu

et al. 2022

Metals

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The effect of Ti microalloying on the precipitation of NbC particles in Nb-microalloyed and Nb-Ti-microalloyed steels was investigated by scanning transmission electron microscopy. The experimental results illustrate that NbC precipitates tend to be formed via a conventional “nucleation and growth” mechanism in Ti-free steel, while the particles would be precipitated as a complex form of TiN cuboid core and NbC hemispherical cap in Ti-Nb-microalloyed steel with 0.009 wt.% Ti and 0.0046 wt.% N. Ti microalloying contributed to the refinement of the precipitate size, and an enhancement of the volume fraction of NbC particles was also found based on the experimental observations.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Effect of Ti Addition on the Precipitation Mechanism and Precipitate Size in Nb-Microalloyed Steels

Jin

Zhu

et al. 2022

Metals

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“…In the case of MnS precipitates (Figure 13), the simulation showed that these only appeared at 1100 °C, while at 1000 °C, their size was negligible, which, during cooling, may directly affect the formation of M23C6 particles, as they are affected by S content. The precipitation models [19,20] indicated that, at 1100 • C, the hot forging deformation produced dynamic recrystallization. As Figure 2 indicates, the upper zone of the steel bar suffered a larger strain difference from zero to~8% which, combined with a more pronounced quenching effect (the surface in direct contact with the quenching fluid), resulted in more pronounced differences in the hardness curve (Figure 3).…”

Section: Resultsmentioning

confidence: 99%

High-Temperature Precipitation Design-of-Experiments Simulation in Low-Alloy Cr–Mo–Ni Hot Forging Steel

Gonzalez-Ojeda

Flores

González

et al. 2021

Metals

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The role of alloying elements such as Cr, Mo and Mn on low-alloy 8620 steel during hot forging operations is not yet clear, as, during deformation in the 1000~1100 °C temperature range, the austenite grain size remains small, ensuring the capacity of the forged part to be subsequently modified by surface hardening procedures. This work analyzed a deformed bar considering hardness at different geometry zones, along with SEM and TEM microstructures of previous austenite grains and lamellar martensite spacing. Moreover, Thermocalc simulations of M7C3, M23C6 and MnS precipitation were combined with Design of Experiments (DOE) in order to detect the sensitivity and significant variables. The values of the alloying elements’ percentages were drastically modified, as nominal values did not produce precipitation, and segregation at the austenite matrix may have been responsible for short-term, nanometric precipitates producing grain growth inhibition.

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“…The precipitation and growth of inclusions are closely related to the composition of liquid steel, microsegregation of elements, and cooling rate during solidification. [4,6,[9][10][11][12][13][14][15] It is well known that AlN inclusions precipitate during solidification of regular Al-killed steels containing 0.04-0.05 mass% aluminum. [9,16] Many researchers [9,17] have found that AlN could precipitate before solidification of high-aluminum and high-nitrogen steel.…”

Section: Introductionmentioning

confidence: 99%

“…During the solidification process, the interdendritic segregation of solute elements leads to the increase of solute concentration in molten steel and promotes the precipitation and growth of inclusions. [11,15] The precipitation and growth of inclusions in turn will consume the segregated solute in molten steel and eventually weaken the segregation of elements. It was found that the microsegregation of Al element was different in Fe-Mn-C-Al twinning-induced plasticity steels with different C and Al contents.…”

Section: Introductionmentioning

confidence: 99%

Effect of Cooling Rate and High N Content on the Precipitation and Growth of AlN Inclusions in Fe–23Mn–2Al–0.08 V High‐Manganese Nonmagnetic Steel

Zhang

Chen

Cheng

et al. 2022

steel research int.

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Industrial experiments are carried out to investigate the precipitation and growth of AlN in Fe–23Mn–2Al–0.08 V steel with nitrogen content up to 80–92 ppm. AlN inclusions can be precipitated before solidification. The morphologies of AlN are mainly divided into hexagonal and needle‐like shapes. With the cooling rate decreasing from 36.66 to 0.71 K s−1, the equivalent diameters of typical AlN increase from 7.56 to 24.20 μm, and the total amount decreases from 203.01 to 60.00 mm−2. The relationship between the cooling rate and the number density is obtained: lnNnormalV=29.848 + 0.453 lnRnormalC. The element segregation analyzed by electronic probe microanalyzer shows that aluminum concentration is low in interdendritic regions but high in dendrites. Aluminum segregation is very weak, and there is almost no nitrogen segregation. Thermodynamic calculation shows that AlN can precipitate before solidification with the nitrogen content higher than 58 ppm. The predicted results of AlN growth by kinetic analysis method can well reveal the growth trend. The nitrogen content (≥58 ppm) has a negligible effect on the size of AlN when the cooling rates are 3.02 and 0.71 K s−1, while the cooling rate has a significant effect on the size of AlN.

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Study on the precipitation and coarsening of TiN inclusions in Ti-microalloyed steel by a modified coupling model

Cited by 22 publications

References 43 publications

Effect of Ti Addition on the Precipitation Mechanism and Precipitate Size in Nb-Microalloyed Steels

Effect of Ti Addition on the Precipitation Mechanism and Precipitate Size in Nb-Microalloyed Steels

High-Temperature Precipitation Design-of-Experiments Simulation in Low-Alloy Cr–Mo–Ni Hot Forging Steel

Effect of Cooling Rate and High N Content on the Precipitation and Growth of AlN Inclusions in Fe–23Mn–2Al–0.08 V High‐Manganese Nonmagnetic Steel

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