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Influence of substituting CaO with SrO on the crystallization behavior of CaO-SiO2 based continuous casting mold fluxes

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Ceramics International 2025年第14期51卷 19449-19462页

作者： Yang, Kang Guan, Rui Zeng, Hong-bo Ai, Xin-gang Li, Sheng-li High-quality Special Steel Intelligent Manufacturing Professional Technology Innovation Center Liaoning Anshan114051 China The Key Laboratory of Material Forming and Structure Property Control Liaoning Anshan114051 China School of Materials and Metallurgy University of Science and Technology Liaoning Liaoning Anshan114051 China

The influence of replacing CaO with SrO on the crystallization behavior of CaO-SiO₂-based continuous casting mold fluxes was systematically examined by using the S/DHTT-TA-III high-temperature in situ thermal analyzer system. The replacement of CaO by SrO prolongs the crystal incubation time in the crystallization process of CaO-SiO₂-based mold fluxes, reduces the crystal growth rate during the crystallization process and plays an inhibitory role in the crystallization process of the mold fluxes. With increasing SrO content, the crystallization mechanism of the mold fluxes gradually changes from constant nucleation and three-dimensional growth to constant nucleation and one-dimensional growth, and the crystallization activation energy gradually increases. The replacement of CaO with SrO reduces the critical cooling rate of CaO-SiO₂-based mold fluxes. The critical cooling rates of the mold fluxes with different SrO contents are 14 °C s-1 (SrO = 0 wt%), 8 °C s-1 (SrO = 3 wt%), 5 °C s-1 (SrO = 6 wt%), and 3.5 °C s-1 (SrO = 9 wt%). With increasing SrO content, the crystallization time of the mold fluxes under gradient heat preservation gradually extends from 0 s to the following: 34 s (SrO = 3 wt%), 58 s (SrO = 6 wt%), and 104 s (SrO = 9 wt%). When the heat preservation time is 200 s, the proportions of the liquid phase fraction of the mold fluxes are 28.73 % (SrO = 0 wt%), 36.28 % (SrO = 3 wt%), 65.58 % (SrO = 6 wt%), and 80.33 % (SrO = 9 wt%), respectively. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Nucleation

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Volume-averaged modeling of multiphase solidification with equiaxed crystal sedimentation in a steel ingot

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China Foundry 2024年第3期21卷 229-238页

作者： Xiao-lei Zhu Shuang Cao Rui Guan Ji Yang Zhe Ning Xin-gang Ai Sheng-li Li Xin-cheng Miao The key Laboratory of Material Forming and Structure Property Control Anshan 114051LiaoningChina State Key Laboratory of Metal Material for Marine Equipment and Application Anshan 114009LiaoningChina School of Materials and Metallurgy University of Science and Technology LiaoningAnshan 114051LiaoningChina

Macrosegregation is a critical factor that limits the mechanical properties of *** impact of equiaxed crystal sedimentation on macrosegregation has been extensively studied,as it plays a significant role in determining the distribution of alloying elements and impurities within a *** improve macrosegregation in steel connecting shafts,a multiphase solidification model that couples melt flow,heat transfer,microstructure evolution,and solute transport was established based on the volume-averaged Eulerian-Eulerian *** this model,the effects of liquid phase,equiaxed crystals,columnar dendrites,and columnar-to-equiaxed transition(CET)during solidification and evolution of microstructure can be considered *** sedimentation of equiaxed crystals contributes to negative macrosegregation,where regions between columnar dendrites and equiaxed crystals undergo significant A-type positive macrosegregation due to the ***,noticeable positive macrosegregation occurs in the area of final solidification in the *** improvement in macrosegregation is beneficial for enhancing the mechanical properties of connecting *** mitigate the thermal convection of molten steel resulting from excessive superheating,reducing the superheating during casting without employing external fields or altering the design of the ingot mold is indeed an effective approach to control macrosegregation.

关键词： ingot casting multiphase solidification model equiaxed crystal sedimentation microstructure macrosegregation

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Effect of Mo Addition on Nanoindentation Creep Behavior of Fecobsinb Bulk Metallic Glasses

SSRN

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SSRN 2023年

作者： Wu, Xiaoyu Li, Xining Li, Xue Li, Shengli Fu, Chunxin School of Materials and Metallurgy University of Science and Technology Liaoning Anshan114051 China The Key Laboratory of Material Forming and Structure Property Control Anshan114051 China

Novel Fe52Co20-xB20Si4Nb4Mox (x = 0–5) bulk metallic glasses with a diameter of 2 mm are successfully prepared by vacuum suction casting and the effect of Mo addition on their nanoindentation creep behavior is studied. Through a differential scanning calorimetry and creep compliance spectral analysis, it is found that the addition of a small amount of Mo increases the enthalpies (ΔH) and free volumes of the alloys. These factors stimulate the rearrangement of the atomic structures of the alloys and induce the adjustment of their internal structure, resulting in a relatively loose atomic packing state that allows the alloys to provide a continuous response to stress during creep deformation. By analyzing the unloading and load holding sections on the load-displacement curves, it is shown that the hysteresis of deformation induces the displacement jump phenomenon and the amplitude of the jump is inversely proportional to the equivalent stress. The larger the equivalent stress, the less obvious the displacement pop-out phenomenon. The changes in strain rate sensitivity exponent (m) and hardness are also studied. Combined with a delay spectral analysis, it is found that a 5% Mo addition significantly improves the creep resistance of the alloys. © 2023, The Authors. All rights reserved.

关键词： Spectrum analysis

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Effect of Mo Addition on Nanoindentation Creep Behavior of Fecobsinb Bulk Metallic Glasses

SSRN

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SSRN 2023年

关键词： Spectrum analysis

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