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Titanium microalloying of steel:A review of its effects on processing,microstructure and mechanical properties

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International Journal of Minerals,Metallurgy and Materials 2022年第4期29卷 645-661页

作者： shuize wang Zhijun Gao Guilin Wu Xinping Mao Beijing Advanced Innovation Center for Materials Genome Engineering University of Science and Technology BeijingBeijing 100083China Guangdong Laboratory for Materials Science and Technology Yangjiang Branch(Yangjiang Advanced Alloys Laboratory)Yangjiang 529500China

Carbon neutrality of the steel industry requires the development of high-strength *** mechanical properties of low-alloy steel can be considerably improved at a low cost by adding a small amount of titanium(Ti)element,namely Ti microalloying,whose performance is related to Ti-contained second phase particles including inclusions and *** proper controlling the precipitation behaviors of these particles during different stages of steel manufacture,fine-grained microstructure and strong precipitation strengthening effects can be obtained in low-alloy ***,Ti microalloying can be widely applied to produce high strength steel,which can replace low strength steels heavily used in various areas *** article reviews the characteristics of the chemical and physical metallurgies of Ti microalloying and the effects of Ti microalloying on the phase formation,microstructural evolution,precipitation behavior of low-carbon steel during the steel making process,especially the thin slab casting and continuous rolling process and the mechanical properties of final steel *** development of Ti microalloying is also proposed to further promote the application of Ti microalloying technology in steel to meet the requirement of low-carbon economy.

关键词： titanium microalloying precipitation grain refinement phase transformation high-strength steel

Tribological properties of high-entropy alloys:A review

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International Journal of Minerals,Metallurgy and Materials 2022年第3期29卷 389-403页

作者： Zhuo Cheng shuize wang Guilin Wu Junheng Gao Xusheng Yang Honghui Wu Beijing Advanced Innovation Center for Materials Genome Engineering University of Science and Technology BeijingBeijing 100083China Yangjiang Branch Guangdong Laboratory for Materials Science and Technology(Yangjiang Advanced Alloys Laboratory)Yangjiang 529500China Department of Industrial and Systems Engineering The Hong Kong Polytechnic UniversityHong KongChina

Tribology,which is the study of friction,wear,and lubrication,largely deals with the service performance of structural *** example,newly emerging high-entropy alloys(HEAs),which exhibit excellent hardness,anti-oxidation,anti-softening ability,and other prop-erties,enrich the wear-resistance alloy *** demonstrate the tribological behavior of HEAs systematically,this review first describes the basic tribological characteristics of single-,dual-,and multi-phase HEAs and HEA composites at room ***,it summarizes the strategies that improve the tribological property of *** review also discusses the tribological performance at elevated temperatures and provides a brief perspective on the future development of HEAs for tribological applications.

关键词： high-entropy alloys tribological properties room temperature elevated temperature

Distribution behavior of inclusions in compact-strip-produced martensitic steel and its influence on mechanical properties

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Journal of Materials Science & Technology 2023年第11期142卷 98-111页

作者： Jing wang Peng Xue Laiqi Zhang Li You Xiaodong Zhu shuize wang Yong Zhong Xinping Mao State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing 100083China Shanghai Key Laboratory of Materials Laser Processing and Modification School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China Research Institute Baoshan Iron&Steel Co.LtdShanghai 201999China Beijing Advanced Innovation Center for Materials Genome Engineering University of Science and Technology BeijingBeijing 100083China

The distribution behavior of inclusions in martensitic steel produced by compact strip production process(CSP-MS)and its influence on mechanical properties were systematically *** inclusions in the CSP-MS specimen are mainly composed of spherical Al_(2)O_(3)-CaO-CaS,MnS with high aspect ratio and small-sized TiN,whereas many coarse cuboidal TiN inclusions do exist in conventional martensitic steel(Con-MS).The high inclusion density of the CSP-MS specimen resulted in lower total elongation and impact toughness,and the MnS inclusions with high aspect ratio led to significantly stronger mechanical anisotropy than that for Con-MS *** in-situ tensile results indicated that when the fracture direction is parallel to MnS direction,the microcracks induced by MnS inclusions tend to propagate into the matrix,leading to the formation of valley-like features,which significantly deteriorate the properties such as the total elongation and impact *** microcracks caused by TiN inclusions are sharper than those caused by spherical Al_(2)O_(3)-CaO-CaS inclusions,and are easy to propagate into the *** work is expected to guide the optimization of the mechanical properties of martensitic steels produced by CSP process and provide a theoretical basis for the CSP process design.

关键词： Martensitic steel Compact strip production Inclusion distribution behavior Mechanical properties In-situ tensile test

A hybrid machine learning model for predicting continuous cooling transformation diagrams in welding heat-affected zone of low alloy steels

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Journal of Materials Science & Technology 2022年第12期107卷 207-215页

作者： Xiaoxiao Geng Xinping Mao Hong-Hui Wu shuize wang Weihua Xue Guanzhen Zhang Asad Ullah Hao wang Beijing Advanced Innovation Center for Materials Genome Engineering Collaborative Innovation Center of Steel TechnologyUniversity of Science and Technology BeijingBeijing 100083China School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083China School of Materials Science and Engineering Liaoning Technical UniversityFuxin 123000China Metals and Chemistry Research Institute China Academy of Railway SciencesBeijing 100081China Department of Mathematical Sciences Karakoram International UniversityGilgit-Baltistan15100Pakistan

Continuous cooling transformation diagrams in synthetic weld heat-affected zone(SH-CCT diagrams)show the phase transition temperature and hardness at different cooling rates,which is an important basis for formulating the welding process or predicting the performance of welding heat-affected ***,the experimental determination of SH-CCT diagrams is a time-consuming and costly process,which does not conform to the development trend of new *** addition,the prediction of SHCCT diagrams using metallurgical models remains a challenge due to the complexity of alloying elements and welding ***,in this study,a hybrid machine learning model consisting of multilayer perceptron classifier,k-Nearest Neighbors and random forest is established to predict the phase transformation temperature and hardness of low alloy steel using chemical composition and cooling *** the SH-CCT diagrams of 6 kinds of steels are calculated by the hybrid machine learning *** results show that the accuracy of the classification model is up to 100%,the predicted values of the regression models are in good agreement with the experimental results,with high correlation coefficient and low error ***,the mathematical expressions of hardness in welding heat-affected zone of low alloy steel are calculated by symbolic regression,which can quantitatively express the relationship between alloy composition,cooling time and *** study demonstrates the great potential of the material informatics in the field of welding technology.

关键词： Continuous cooling transformation Heat-affected zone Machine learning Symbolic regression

Recent research progress on the phase-field model of microstructural evolution during metal solidification

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International Journal of Minerals,Metallurgy and Materials 2023年第11期30卷 2095-2111页

作者： Kaiyang wang Shaojie Lv Honghui Wu Guilin Wu shuize wang Junheng Gao Jiaming Zhu Xusheng Yang Xinping Mao Beijing Advanced Innovation Center for Materials Genome Engineering Institute for Carbon NeutralityUniversity of Science and Technology BeijingBeijing 100083China Institute of Steel Sustainable Technology Liaoning Academy of MaterialsShenyang 110004China Institute of Materials Intelligent Technology Liaoning Academy of MaterialsShenyang 110004China School of Civil Engineering Shandong UniversityJinan 250061China Department of Industrial and Systems Engineering The Hong Kong Polytechnic UniversityHong Kong 999077China

Solidification structure is a key aspect for understanding the mechanical performance of metal alloys,wherein composition and casting parameters considerably influence solidification and determine the unique microstructure of the *** following the principle of free energy minimization,the phase-field method eliminates the need for tracking the solid/liquid phase interface and has greatly accelerated the research and development efforts geared toward optimizing metal solidification *** recent progress in the application of phasefield simulation to investigate the effect of alloy composition and casting process parameters on the solidification structure of metals is summarized in this *** effects of several typical elements and process parameters,including carbon,boron,silicon,cooling rate,pulling speed,scanning speed,anisotropy,and gravity,on the solidification structure are *** present work also addresses the future prospects of phase-field simulation and aims to facilitate the widespread applications of phase-field approaches in the simulation of microstructures during solidification.

关键词： solidification process phase-field models microstructure evolution alloy composition casting process parameters

Perspective on antiferroelectrics for energy storage and conversion applications

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Chinese Chemical Letters 2021年第7期32卷 2097-2107页

作者： Fangping Zhuo Huimin Qiao Jiaming Zhu shuize wang Yang Bai Xinping Mao Hong-Hui Wu Beijing Advanced Innovation Center for Materials Genome Engineering University of Science and Technology Beijing Department of Materials and Earth Science Technical University of Darmstadt School of Advanced Materials and Engineering Sungkyunkwan University(SKKU) Department of Mechanical Engineering The Hong Kong Polytechnic University

As a close relative of ferroelectricity,antiferroelectricity has received a recent resurgence of interest driven by technological aspirations in energy-efficient applications,such as energy storage capacitors,solid-state cooling devices,explosive energy conversion,and displacement *** prolonged efforts in this area have led to certain progress and the discovery of more than 100 antiferroelectric materials over the last 70 years,some scientific and technological issues remain ***,we provide perspectives on the development of antiferroelectrics for energy storage and conversion applications,as well as a comprehensive understanding of the structural origin of antiferroelectricity and field-induced phase transitions,followed by design strategies for new lead-free *** also envision unprecedented challenges in the development of promising antiferroelectric materials that bridge materials design and real *** research in these directions will open up new possibilities in resolving the mystery of antiferroelectricity,provide opportunities for comprehending structure-property correlation and developing antiferroelectric/ferroelectric theories,and suggest an approach to the manipulation of phase transitions for real-world applications.

关键词： Antiferroelectric materials Energy storage Energy conversion Solid-state cooling Structural origin Phase transition

Effect of deformation parameters on the austenite dynamic recrystallization behavior of a eutectoid pearlite rail steel

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International Journal of Minerals,Metallurgy and Materials 2024年第5期31卷 833-841页

作者： Haibo Feng Shaohua Li Kexiao wang Junheng Gao shuize wang Haitao Zhao Zhenyu Han Yong Deng Yuhe Huang Xinping Ma Institute for Carbon Neutrality University of Science and Technology BeijingBeijing 100083China Institute for Steel Sustainable Technology Liaoning Academy of MaterialsShenyang 110004China Pangang Group Panzhihua Iron and Steel Research Institute Co.Ltd. Panzhihua 617000China

Understandings of the effect of hot deformation parameters close to the practical production line on grain refinement are crucial for enhancing both the strength and toughness of future rail *** this work,the austenite dynamic recrystallization(DRX)behaviors of a eutectoid pearlite rail steel were studied using a thermo-mechanical simulator with hot deformation parameters frequently employed in rail production *** single-pass hot deformation results reveal that the prior austenite grain sizes(PAGSs)for samples with different deformation reductions decrease initially with an increase in deformation ***,once the deformation temperature is beyond a certain threshold,the PAGSs start to *** can be attributed to the rise in DRX volume fraction and the increase of DRX grain with deformation temperature,***-pass hot deformation results show that the accumulated strain generated in the first and second deformation passes can increase the extent of *** the case of complete DRX,PAGS is predominantly determined by the deformation temperature of the final *** suggests a strategic approach during industrial production where part of the deformation reduction in low temperature range can be shifted to the medium temperature range to release rolling mill loads.

关键词： eutectoid pearlite rail steel prior austenite grain size dynamic recrystallization single-pass hot deformation three-pass hot deformation

Enhanced Hydrogen Embrittlement Resistance via Cr Segregation in Nanocrystalline Fe-Cr Alloys

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Acta Metallurgica Sinica(English Letters) 2023年第12期36卷 1925-1935页

作者： Linshuo Dong Feiyang wang Hong-Hui Wu Mengjie Gao Penghui Bai shuize wang Guilin Wu Junheng Gao Xiaoye Zhou Xinping Mao Beijing Advanced Innovation Center for Materials Genome Engineering Innovation Research Institute for Carbon NeutralityUniversity of Science and Technology BeijingBeijing 100083China Institute of Steel Sustainable Technology Liaoning Academy of MaterialsShenyang 110004China Department of Materials Science and Engineering Shenzhen MSU-BIT UniversityShenzhen 518172China

Hydrogen is a clean fuel with numerous sources,yet the hydrogen industry is plagued by hydrogen embrittlement(HE)issues during the storage,transportation,and usage of hydrogen *** can compromise material performance during service,leading to significant safety hazards and economic *** the current work,the influence of element Cr on the HE resistance of nanocrystalline Fe-Cr alloys under different hydrogen concentrations and strain rates was *** hybrid Monte Carlo(MC)and molecular dynamics(MD)simulations,it was found that Cr atoms were segregated at grain boundaries(GB)and inhibited the GB ***,Cr segregation improved the strength and plasticity of the nanocrystalline Fe-Cr alloys,especially the HE ***,the Cr segregation reduced the diffusion coefficient of hydrogen and inhibited hydrogen-induced *** work provided new insight into the development of iron-based alloys with high HE resistance in the future.

关键词： Hydrogen embrittlement Molecular dynamics simulations Cr segregation Grain boundary Nanocrystalline materials

Enhanced nanocrystalline stability of BCC iron via copper segregation

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Progress in Natural Science:Materials International 2023年第2期33卷 185-192页

作者： Feiyang wang Linshuo Dong Hong-Hui Wu Penghui Bai shuize wang Guilin Wu Junheng Gao Jiaming Zhu Xiaoye Zhou Xinping Mao Beijing Advanced Innovation Center for Materials Genome Engineering Institute for Carbon Neutrality University of Science and Technology Beijing Institute of Materials Intelligent Technology Liaoning Academy of Materials 3. Institute of Steel Sustainable Technology Liaoning Academy of Materials School of Civil Engineering Shandong University Department of Materials Science and Engineering Shenzhen MSU-BIT University

Nanocrystalline alloys are known for their high density of grain boundaries(GBs), which results in low thermal stability and a tendency for coarsening. In this work, we investigated Fe–Cu alloys to explore the effects of Cu concentration on the thermal stability of nanocrystalline samples. Using hybrid molecular dynamics(MD) and Monte Carlo(MC) simulations, annealing treatments of nanocrystalline samples with varied Cu concentrations were conducted. The simulation results revealed that Cu atoms tended to accumulate at GBs. Subsequently, the model with Cu segregation was subjected to mechanical creep loading at various temperatures. Through the analysis of atomic structure evolution during creep deformation, it was found that Cu segregation efficiently stabilizes GBs and restricts their movement. The present findings highlight that the thermal stability of nanocrystalline Fe–Cu alloys can be effectively improved by introducing suitable Cu segregation at GBs.

关键词： Nanocrystalline alloys Molecular dynamics simulations Grain boundary Thermal stability