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Oxidation induced ductility enhancement of Zr based metallic glass ribbons in vicinity of glass transition temperature

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China Foundry 2022年第1期19卷 75-80页

作者： Jin-tao Wang Xue-feng Gao Rui-chun Wang Yin-xiao Wang Fu-yu Dong Wen-ying Xue Hong-wang Yang School of Materials Science and Engineering Shenyang University of TechnologyShenyang 110870China School of Intelligent Manufacturing Weifang University of Science&TechnologyShouguang 262700ShandongChina State Key Lab of Rolling&Automation Northeastern UniversityShenyang 110819China

Zr-based metallic glasses(MGs)possess a wide supercooled liquid region,which gives a wide processing window for superplastic forming to make microdevices with demanding size accuracy and surface *** existence of oxygen may have an influence on the thermoplastic deformation ***,the effect of oxidation on the mechanical behavior of the MGs in the vicinity of glass transition temperature is of great significance for practical forming of MG *** the present study,the effect of oxidation on tensile properties of Zr50Cu40Al10 metallic glass was *** tested samples were characterized by XRD and SEM *** the samples tested in air,the strength decreases 187 MPa,61 MPa and 59 MPa and the ductility increases 0.31,0.36,and 0.77 at 420℃,430℃,and 440℃,respectively,compared with those tested in flowing ***_(2) preferentially formed during the tensile testing at 420℃,and both ZrO_(2) and Al_(2)O_(3) oxides formed at 430℃.The dilution of Zr elements in the remaining amorphous matrix caused by preferential oxidation on the surface layer attributes to the decrease in strength and enhancement in ductility of the Zr_(50)Cu_(40)Al_(10) metallic glasses.

关键词： metallic glass mechanical properties tensile test preferential oxidation high temperature

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Macroscopic and nanoscale investigation of the enhanced wear properties of medium-Mn steel processed via room-temperature quenching and partitioning

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WEAR 2023年 522卷

作者： Yan, Xincheng Hu, Jun Zhang, Xiao Xu, Wei Northeastern Univ State Key Lab Rolling & Automation Shenyang 110819 Peoples R China

High-manganese austenitic and high hardness martensitic steels are widely used in wear-related applications. However, their abrasive wear performance is unsatisfactory because of the insufficient twinning induced plas-ticity effect of the former and the weak strain hardening and low crack resistance during wear of the latter. Here, novel wear-resistant steels were developed via alloy design and simple room-temperature quenching and par-titioning (RT-Q&P) of medium Mn steels (0.3C-10Mn and 0.3C-10Mn-0.25V). Their microstructure and sliding abrasive wear behavior were compared to those of conventional Hardox400 and Hadfield steels. The two medium-Mn steels had better wear properties than conventional wear-resistant steels. Moreover, the V -con-taining steel with a multiphase microstructure of tempered martensite, retained austenite, and nano-vanadium carbide precipitates, possessed 2.98 and 3.45 times higher abrasive wear resistance than the Hardox400 and Hadfield steels, respectively. Besides the stimulated transformation-induced-plasticity effect in RT-Q&P steels, the enhanced abrasive wear resistance of V-containing steel was attributed to microstructural refinement and improved strain hardening during wear imparted by V element. The main wear mechanism of RT-Q&P wear -resistant steels was cutting, while it was grooves and pits for Hadfield steel, and peeling pits and delamina-tion for Hardox400 steel. This study can guide the design of structural materials with excellent wear resistance through multiphase microstructural and nano-precipitate regulation to overcome the wear challenges of components.

关键词： Wear -resistant medium-Mn steel RT-Q & P process TRIP effect Nano -precipitates

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Effect of copper on edge cracking behavior and microstructure of rolled austenitic stainless steel plate

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Journal of Iron and Steel Research International 2022年第2期29卷 281-294页

作者： Guang-hui Zhao Jian Zhang Juan Li Hua-ying Li Hai-tao Liu Li-feng Ma School of Mechanical Engineering Taiyuan University of Science and TechnologyTaiyuan030024ShanxiChina Shanxi Provincial Key Laboratory of Metallurgical Device Design Theory and Technology Taiyuan030024ShanxiChina State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang110819LiaoningChina

Cu is known to affect the edge cracking characteristics of austenitic stainless steel as it causes *** hot rolling test of four kinds of austenitic stainless steel with different copper content(0,2.42,3.60 and 4.35 wt.%)was carried out to examine the effect of hot rolling cracks on steel containing different copper *** evolution of crack and microstructure was analyzed using the scanning electron microscope,energy-dispersive spectrometer,electron back scattered diffraction and transmission electron *** results showed an upward trend in edge cracking degree when Cu content was 4.35%,and the crack extended from the edge of the steel plate to the middle by about 14 ***,severe oxidation was observed inside the crack by *** the increase in copper content at 1250℃,the content of{110}<112>brass and{112}<111>copper textures *** the content of copper was 4.35%,the decrease was most significant,and{112}<111>copper texture content decreased to only 0.5%.Generally,the textures of 2.42%Cu and 3.60%Cu 304L steel changed little,while a large change in the texture of 4.35%Cu 304L steel was *** conclude,the increase in rolling temperature can prevent edge crack and its propagation effectively.

关键词： Austenitic stainless steel Copper Edge crack Microstructure Ferrite

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Rapid Visualization of Microstructural Evolution during Hot Strip rolling Using Phenomenological Models and the Laguerre-Voronoi Diagram

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STEEL RESEARCH INTERNATIONAL 2023年第3期94卷

作者： Cui, Chunyuan Cao, Guangming Liu, Jianjun Cao, Yang Zhang, Chengde Liu, Zhenyu Northeastern Univ State Key Lab Rolling & Automation Shenyang 110819 Peoples R China

Microstructural evolution during hot rolling, which is complex and in a state of the black box, has a significant impact on the microstructure and mechanical properties of steel products. Herein, a rapid methodology is developed to track and visualize the evolution of the microstructural state, and a novel approach coupled with phenomenological recrystallization kinetics is proposed to calculate grain size and its distribution by considering the effects of the size, shape, and mixed fraction of nonrecrystallized grains, and by using the Laguerre-Voronoi diagram, the microstructural morphologies are reconstructed. Based on the proposed approach, the variations of the recrystallization fraction, grain size, and its distribution with time during rolling are analyzed, and the microstructural features in various recrystallization stages are discussed. Additionally, this strategy is demonstrated to be time efficient.

关键词： hot-rolled steel Laguerre-Voronoi diagram microstructural visualization phenomenological recrystallization kinetics

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Influence of jet angle on heat transfer during cooling of hot rolled seamless steel tubes

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INTERNATIONAL JOURNAL OF THERMAL SCIENCES 2023年第1期189卷

作者： Zhang, Rui Li, Zhenlei Zhang, Yansheng Chen, Dong Yuan, Guo Northeastern Univ State Key Lab Rolling & Automation Shenyang 110819 Peoples R China

Cooling has a great impact on the microstructure of metal materials, which is a crucial manufacturing link in the steel field. However, steel tube often has defects such as bending and cracking during the cooling process. The reasons are differences in cooling strength and uneven cooling. The jet angle is one of the important parameters in the cooling process. Therefore, this study takes the jet angle as the research variable. During the experiment and simulation, the jet angle was changed from 0 degrees to 30 degrees, and other process parameters remained unchanged. The distribution of velocity and temperature of the steel tube are analyzed by simulation method. The results show that the jet angle has a significant effect on the cooling of the seamless steel tube. The asymmetry of ve-locity is more significant with the increase of jet angle. In addition, the wetting behavior of steel tube surface under different jet angles was observed experimentally. The wetting distance in the downstream direction is greater than that in the countercurrent direction. With cooling time increasing, this difference gradually in-creases. Moreover, the cooling intensity could be improved to a certain extent by changing the jet angle.

关键词： Jet cooling Seamless steel tube Jet angle Numerical simulation Wetting behavior

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Effect of Cr-rich carbide precipitates on austenite stability and consequent corrosion behavior of ultrafine-grained 304 stainless steel produced by cryogenic rolling and annealing treatment

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MATERIALS CHARACTERIZATION 2023年 195卷

作者： Zhao, Miaomiao Wu, Hongyan Zhang, Bin Lu, Jianing Du, Linxiu Northeastern Univ State Key Lab Rolling & Automation Shenyang 110819 Peoples R China

The effect of Cr-rich carbide precipitates on the austenite stability and corrosion behavior of ultrafine-grained 304 stainless steel obtained by cryogenic rolling and subsequent different reversion annealing temperatures were systematically studied. Experimental results demonstrated that the number and size of Cr-rich carbide precipitates gradually decreased as the annealing temperature increased from 700 degrees C to 900 degrees C. The tensile tests revealed that the martensite volume fraction rapidly increased as the true strain increased for the ultrafine-grained sample prepared by annealing at 700 degrees C when compared to 800 degrees C and 900 degrees C. The results of the electrochemical experiments revealed that the corrosion resistance of ultrafine-grained samples increased with annealing temperature from 700 degrees C to 900 degrees C, with annealing at 900 degrees C providing the best pitting corrosion resistance. According to the findings, the Cr-rich carbide precipitates formed during the reversion annealing process reduced the austenite stability and corrosion resistance of ultrafine-grained stainless steels, as evidenced by promoting strain-induced martensite formation and occurrence of pitting corrosion.

关键词： Austenitic stainless steel Ultrafine grains Cr-rich carbide precipitate Austenite stability Corrosion behavior

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Effect of Cr on Isothermal Structure Transformation of Iron Oxide Scale

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STEEL RESEARCH INTERNATIONAL 2023年第5期94卷

作者： Cao, Guangming Wang, Chenyang Jiang, Yuchen Li, Silin Gao, Xinyu Liu, Zhenyu Northeastern Univ State Key Lab Rolling & Automation Shenyang 110819 Peoples R China

Herein, the effect of different contents of Cr on the isothermal structure transformation of FeO is systematically studied by a thermogravimetric analyzer, and it is found that the temperature range of eutectoid transformation of FeO in Fe-Cr alloy is 300-500 degrees C. Combined with the experimental data, the kinetic model of isothermal phase transformation of FeO is established based on Johnson-Mehl-Avrami-Kolmogorov equation, and the time-temperature-transformation curve of isothermal transformation of FeO is predicted, which follows the law of C curve, and the C curve shifts backward with the increase of Cr content. Therm-calc thermodynamic software calculates the Fe-O phase diagrams of different Cr contents. Combined with the experimental results, the effect mechanism of Cr content on FeO eutectoid transformation is clarified. With the increase of Cr content, the stability of FeO decreases, and under the same isothermal temperature and time, high Cr content has greater undercooling, a higher driving force of phase transition, and the starting time of eutectoid transformation is earlier than that of lower Cr content.

关键词： Cr eutectoid structures eutectoid transformations iron oxide scales isothermal transformation kinetic models

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Machine learning-assisted structure design and materials screening of a bilayer thin-film selective thermal emitter for infrared stealth technology

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CHEMICAL ENGINEERING JOURNAL 2025年 509卷

作者： Niu, Sijia Ren, Zhiyu Wang, Chenchong Liu, Xiaoming Mu, Wangzhong Wang, Qiang Northeastern Univ Key Lab Electromagnet Proc Mat Minist Educ Shenyang 110819 Peoples R China Northeastern Univ Sch Mat Sci & Engn Shenyang 110819 Peoples R China Northeastern Univ State Key Lab Rolling & Automation Shenyang 110819 Peoples R China KTH Royal Inst Technol Dept Mat Sci & Engn SE-10044 Stockholm Sweden

Selective mid-infrared radiative materials hold a significant potential for the applications in infrared stealth, radiative cooling, and energy utilization. The immense diversity of material combinations and structural designs profoundly complicates achieving infrared stealth compatible with thermal management in simple thin-film structures. In the current study, we successfully designed a Ge-Ti bilayer thin-film selective thermal emitter through high-throughput screening of materials and structural design, facilitated by artificial intelligence and finite element simulation. This designed structure demonstrates a low emissivity within the infrared atmospheric window and a high emissivity outside it (e5-8 mu m = 0.814), providing an excellent radiative heat control. It significantly lowers the apparent temperature as observed by thermal imaging cameras, compared to traditional low-emissivity materials. The simplicity and scalability of its production, alongside its superior stealth properties, make it exceptionally promising for the practical applications. Furthermore, this data-driven approach has deepened the understanding of emission mechanisms in bilayer thin-film selective thermal emitter, offering a versatile framework for designing bilayer thin films with customized emissivity spectra. This work paves the way for utilization of a combination AI-based approach to design advanced mid-infrared radiative materials.

关键词： Bilayer thin-film selective emitter Thermal radiation Multi-band camouflage Strcture design Material selection Machine learning

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Generalized stability criterion for controlling solidification segregation upon twin-roll casting

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Journal of Materials Science & technology 2023年第3期134卷 163-177页

作者： Pan Wu Yubing Zhang Jiaqi Hu Shaojie Song Yong Li Huiyuan Wang Guo Yuan Zhaodong Wang Shizhong Wei Feng Liu State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi’an 710072China Analytical and Testing Center Northwestern Polytechnical UniversityXi’an 710072China State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819China State Key Laboratory of Super hard Materials Jilin UniversityChangchun 130012China National Joint Engineering Research Center for Abrasion Control and Molding of Metal Materials Henan University of Science and TechnologyLuoyang 471003China

Macro-and micro-segregation formed upon twin-roll casting(TRC)can be inherited from sub-rapid solid-ification to solid-state transformation,even to plastic deformation,thus deteriorating drastically mechan-ical properties of as-produced thin *** many works focusing mainly on controlling fields of thermal,concentration and convection have been reported,how to control artificially and quantitatively the segregation using a theoretical connection between processing parameters and solidification models,has not been realized,*** it,a systematical framework integrating non-equilibrium dendritic growth and overall solidification kinetics with the TRC parameters,was constructed applying a general-ized stability(GS)conception deduced from transient thermodynamic driving force△G^(t)and transient ki-netic energy barrier Q_(eff)^(t)evolving upon *** from this framework considering synergy of thermodynamics and kinetics(i.e.,thermo-kinetic synergy),a criterion of high△G^(t)-high GS guaranteed that the macro(i.e.,the centerline)and the micro(i.e.,the edge)segregation can be suppressed by in-creasing△G^(t)and GS at the beginning and the ending stage of sub-rapid solidification,*** typical thermo-kinetic combination producing the microstructure can be inherited into the plastic de-formation,as reflected by corresponding strength-ductility *** work realized quantitative controlling of TRC by a theoretical connection between processing parameters and solidification models,where,an optimization for sub-rapid solidification segregation using the GS conception including△G^(t)and Q_(eff)^(t)has been performed.

关键词： Segregation Sub-rapid solidification Generalized stability Twin-roll casting Thermo-kinetics

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Effect of the oxide layer structure on the decarburization behavior of 60Si2Mn spring steel in dry air: Experimental and first-principle study

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MATERIALS CHARACTERIZATION 2023年第1期196卷

作者： Li, Hua Zhao, Xianming Zhang, Hongliang Li, Dezhi Li, Jie Northeastern Univ State Key Lab Rolling & Automation Shenyang 110819 Peoples R China

In recent decades, research on 60Si2Mn spring steel has focused on decarburization and ignored its oxidation behavior. However, Si affects the oxide layer structure of 60Si2Mn spring steel, so it significantly impacts the decarburization behavior. Because the effect of the oxide layer structure on its decarburization behavior has not been systematically clarified, this paper examines it for 60Si2Mn spring steel in dry air using a combination of experiments and first-principles calculations. It was found that at 1000 degrees C and 1100 degrees C, the oxide layer was mainly composed of the Fe2O3 + Fe3O4 + FeO/Fe2SiO4 layers. Decarburization was significantly hindered by Fe2SiO4. Fe2SiO4 has a much higher crack formation energy (3.14 J/m2) than FeO (0.51 J/m2), which indicates that it is more difficult to form cracks in the Fe2SiO4 layer. It is difficult for the gas produced by the reaction between FeO and C to diffuse out through a crack in the inner FeO/Fe2SiO4 oxide layer, which hinders decar-burization. The presence of a Fe2SiO4layer is effective in providing decarburized protection.

关键词： 60Si2Mn spring steel Oxidation kinetics Oxide layer Decarburized layer Fe2SiO4 Crack formation energy

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