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Effect of pouring time on microstructure and mechanical properties of centrifugal cast Ti-46Al alloy tubes

China Foundry 2025年第1期22卷 65-74页

作者： Gang Huang Qian Dang Cong-cong Su Jing Zhao Chi Zhang Guo-huai Liu Zhao-dong Wang The State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819China School of Materials Science and Engineering Shenyang University of TechnologyShenyang 110870China

The grain size of TiAl alloy castings prepared by traditional casting process is coarse,thus showing poor mechanical *** this study,a new type of high performance Ti-46Al alloy tube prepared by vacuum centrifugal casting technology was *** research comprehensively examined the influence of pouring time on the microstructure and mechanical performance of the castings,employing both experimental approaches and ProCast simulation *** findings indicate that prolonging the pouring time facilitates a microstructural evolution from coarse columnar grains to refined equiaxed *** the condition of pouring temperature of 1,600℃,rotation speed of 800 r·min^(-1) and pouring time of 6 s,the tensile strength of Ti-46Al alloy at room temperature reaches 650 MPa,and the tensile strength at 800℃ reaches 705 MPa,which is significantly higher than that of traditional as-cast Ti-Al alloy.

关键词： vacuum induction melting centrifugal casting Ti-46Al alloy pouring time Ti-Al alloy tubes

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Calculation of Calcium Ion Activity in the CaF2-Al2O3-CaO-SiO2-MgO Slag System and Its Impact on Calcium Content in Steel

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METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE 2025年第3期56卷 3187-3202页

作者： Li, Yi-Ming Tian, Jia-Long Jiang, Zhou-Hua Northeastern Univ Sch Met Shenyang 110819 Peoples R China Northeastern Univ State Key Lab Rolling & Automation Shenyang 110819 Peoples R China

This study aims to control the increase of calcium content in ingots during the electroslag remelting (ESR) process by designing suitable slag compositions. Analysis of industrial data using machine learning identified calcium ion activity in slag and electrode melting rate as the key factors influencing ingot calcium content. Based on industrial practice, a CaF2-Al2O3-CaO-SiO2-MgO slag system generated 138,347 slag combinations. Using thermodynamic data and MICT, slag compositions with lower calcium ion activity were identified while maintaining stable melting points, viscosity, and conductivity. ESR experiments with 1.2343 mold steel confirmed that lower calcium ion activity in slag reduces calcium content in ingots, leading to the development of a slag composition (Model-3) with minimal calcium-increasing potential. These results confirmed the correlation between slag calcium ion activity and ingot calcium content, validating MICT's reliability in predicting slag calcium ion activity. To further investigate the effects of slag components, 138,347 slag compositions were ranked on a scale of 0 to 10 based on calcium ion activity, deriving interaction coefficients among the components. A predictive equation for ingot calcium content was also developed, accurately forecasting calcium levels in ESR ingots for various slag compositions and melting rates in 5 to 15 tons furnaces.

关键词： Electroslag remelting

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From creep-life prediction to ultra-creep-resistant steel design: An uncertainty-informed machine learning approach

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ACTA MATERIALIA 2025年 292卷

作者： Wang, Chenchong Wei, Xiaolu van der Zwaag, Sybrand Wang, Qiang Xu, Wei Northeastern Univ State key Lab rolling & automation Shenyang 110819 Liaoning Peoples R China Delft Univ Technol Fac Aerosp Engn Novel Aerosp Mat Grp NL-2629 HS Delft Netherlands Northeastern Univ Key Lab Electromagnet Proc Mat Minist Educ Shenyang 110819 Liaoning Peoples R China

In this research a machine learning model incorporating uncertainty to enhance the creep-life prediction and high-throughput design of creep-resistant steel is proposed. The framework integrates key physical metallurgical parameter linked to precipitate coarsening and applies transfer learning to correlate short-time tensile properties with the creep performance, all within a Bayesian convolutional neural network. Unlike conventional machine learning models, which often lack an assessment of prediction credibility, this uncertainty-based approach offers more accurate and stable predictions while also providing a measure of prediction credibility. By combining the model with a genetic algorithm, the framework achieves a balance between creep life optimization and uncertainty, thereby supporting robust alloy design. The validation on newly developed martensitic heat-resistant steels with tolerable prediction uncertainty showed excellent alignment between predicted and experimentally determined creep life, underscoring the effectiveness of the framework. These findings highlight the critical role of uncertainty modeling in advancing machine learning applications for alloy design.

关键词： Creep life Machine learning Transfer learning Alloy design Uncertainty

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Fabrication of Zn-0.5Mn-0.05 Mg Micro-Tube with Suitable Strength and Ductility for Vascular Stent Application

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Acta Metallurgica Sinica(English Letters) 2025年第2期38卷 327-337页

作者： Dongfang Lou Mingda Zhang Yuping Ren Hongxiao Li Gaowu Qin Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education) School of Materials Science and EngineeringNortheastern UniversityShenyang 110819China Institute of Materials Intelligent Technology Liaoning Academy of MaterialsShenyang 110004China Research Center for Metallic Wires Northeastern UniversityShenyang 110819China State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819China

Biodegradable Zn alloys are a hot topic in the biodegradable vascular stent materials,the study on preparing Zn alloys microtubes for vascular stent is still insufficient and none of the tubes could well meet the mechanical requirement by *** this study,we fabricate Zn-0.5Mn-0.05 Mg microtube with outer diameter of 3.5 mm and wall thickness of 0.2 mm by five passes three-roller *** mechanical properties of the microtube are 277±2.9 MPa,330±3.3 MPa and 39.8±5.25%for the yield tensile strength(YTS),ultimate tensile strength(UTS)and break elongation,respectively,which well satisfies the requirements of the vascular *** leading factors to the variations of the mechanical property are texture evolution,grain size refinement and microstructure uniformity during the rolling process,and the main deformation mechanisms are twinning and dislocation *** a result of the dynamic recrystallization,the grain size decreases obviously and the microstructure gets more uniform as the rolling pass *** texture gradually changes from a basal texture<0110>‖ED(extrusion direction)for the as-extruded tube blank to deformation texture<0001>‖RD(rolling direction)and non-basal texture<0221>‖RD for the 5-pass rolled microtube.

关键词： Zn alloys Microtube Microstructure Mechanical property Three-roller rolling

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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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Influence of multilayer sea sand and Shewanella algae on the corrosion behavior of 316 SS

NPJ MATERIALS DEGRADATION

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NPJ MATERIALS DEGRADATION 2025年第1期9卷 1-11页

作者： Shen, Yufeng Ma, Rongyao Wang, Changgang Dong, Junhua Xu, Dake Univ Sci & Technol China Sch Mat Sci & Engn Shenyang Peoples R China Chinese Acad Sci Inst Met Res Shenyang Natl Lab Mat Sci Shenyang Peoples R China Northeastern Univ Shenyang Natl Lab Mat Sci Shenyang Peoples R China Northeastern Univ State Key Lab Rolling & Automation Shenyang Peoples R China

The effects of multilayer sea sand particles of varying sizes and Shewanella algae (S. algae) on the corrosion behavior of 316 stainless steel (SS) were investigated. The findings reveal that in a sterile environment, sand hinders the diffusion of dissolved oxygen, thereby impeding the growth of the passive film and enhancing the corrosion of 316 SS. The promotion effect intensifies as the particle size of the sand decreases. In a non-sterile environment, in the absence of sand, S. algae accelerates the corrosion by consuming dissolved oxygen, and expediting the breakdown of passive film. The corrosion acceleration caused by S. algae is markedly greater than that induced by sand. When sand is present, it markedly reduces the effective attachment of S. algae, thereby mitigating the corrosion-accelerating effect of S. algae. Additionally, a reduction in sand particle size leads to a decrease in S. algae attachment and an enhancement in corrosion inhibition.

关键词： Multilayers

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Influence of transverse property differences in hot-rolled high-strength strip on cold rolling deformation behavior

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International Journal of Advanced Manufacturing technology 2025年第5期138卷 2491-2509页

作者： Li, Xiaohua Li, Xu Han, Yuejiao Jin, Shuren Wang, Pengfei Zhang, Xin Zhang, Yong The State Key Laboratory of Rolling and Automation Northeastern University Liaoning Shenyang110819 China National Engineering Research Center for Equipment and Technology of Cold Strip Roling Yanshan University Hebei Qinhuangdao066004 China The Cold Rolling Mill Ben Gang Steel Plates Co. Ltd Liaoning Benxi117021 China School of Resources and Materials Northeastern University at Qinhuangdao Hebei Qinhuangdao066004 China

In recent years, the widespread application of high-strength strips in industries such as automotive manufacturing and household appliances has imposed increasingly stringent requirements on dimensional accuracy, while also heightening the sensitivity to variations in the raw material properties during cold rolling. The presence of transverse property differences (TPD) in hot-rolled high-strength strips has been found to significantly undermine the quality stability of cold-rolled products. To address this issue, a simulation of transverse performance variability during rolling was carried out based on the finite element method. The simulation results showed that the relative errors between the calculated rolling force, the central thickness of the strip, and the measured values were controlled within ±6% and ±0.25%, respectively. Further analysis revealed that when the transverse yield strength fluctuated between 425 and 570 MPa, the corresponding rolling pressure exhibited a consistent wavy distribution, resulting in localized deformation non-uniformity. These differences led to the formation of "local wave" on the surface, particularly in regions with abrupt yield strength changes exceeding 30 MPa over 50 mm. Additionally, by comparing rolling conditions with and without property homogenization, it was observed that the thickness calculation error could reach up to 15 µm, indicating a significant improvement in strip shape. Finally, the effects of reduction rate, roll bending, and roll shifting on the shape evolution of the strip with transverse property variation are described and discussed. © The Author(s), under exclusive licence to Springer-Verlag London Ltd., part of Springer Nature 2025.

关键词： Cold rolling

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Effect of Trace V on the Microstructure and Properties of Al-Zn-Mg-Cu Alloys During Heat Treatments by Twin-Roll Casting

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JOM 2025年 1-13页

作者： Meng, Longzhou Xu, Yifei Tang, Hongqun Qian, Xiaoming Peng, Yan Wang, Zhaodong Li, Yong Jezierski, Jan National Engineering Research Center for Equipment and Technology of Cold Strip Rolling Yanshan University Qinhuangdao 066004 China State Key Laboratory of Rolling and Automation Northeastern University Shenyang 110819 China State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures Guangxi University Nanning 530004 China Guangxi Advanced Aluminum Processing Innovation Center Co. LTD Nanning 530007 China Department of Foundry Engineering Silesian University of Technology Towarowa 7 Gliwice 44-100 Poland

The impact of trace V on the microstructure and mechanical characteristics of the Al-Zn-Mg-Cu alloy produced by twin-roll casting has been examined. Following homogenization, AlZnMgCu, S-Al₂CuMg, and Al₇Cu₂Fe were among the primary phases that remained after the majority of the eutectic structure dissolved. The impact of dispersoids on the mechanical characteristics and intergranular corrosion resistance were examined, along with the precipitation behavior and recrystallization of Al₃Zr and Al₂₁V₂ in the alloy. The hardness and yield strength of the V-containing alloy increase after homogenization, rolling, solution, and aging treatment. This enhancement may be attributed to the fine Al₃Zr and Al₂₁V₂ particles’ precipitation strengthening, which augmented the traditional η′ phase precipitation strengthening. With the addition of V, the aging treatment alloy’s intergranular corrosion resistance was enhanced since there were fewer high-angle grain boundaries. © The Minerals, Metals & Materials Society 2025.

关键词： Intergranular corrosion

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Eﬀects of manganese and chromium on sulﬁde stress cracking in 125 ksi grade high-strength low-alloyed steel for oil country tubular goods

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Corrosion Science 2025年 245卷

作者： Wu, Zihan Wang, Chao Wang, Yunkai Si, Tingzhi Kang, Jian Yuan, Guo State Key Laboratory of Rolling and Automation Northeastern University Shenyang110004 China School of Materials Science and Engineering Anhui University of Technology Maanshan243002 China

In this study, 125 ksi-grade oil casing steels with three chromium and two manganese contents were investigated through orthogonal experiments, and the resulting sulphide stress cracking (SSC) behaviours were analysed using the NACE-A method. The impact of manganese and chromium on the SSC performance was examined through a series of experiments involving microstructural assessments and hydrogen permeation tests. Limiting the chromium and manganese content proved to be pivotal in reducing the quantity of reversible hydrogen traps and Σ3 grain boundaries. Therefore, the proportion of manganese sulphide (MnS) precipitation was reduced, ultimately improving the resistance of the material to SSC. © 2025 Elsevier Ltd

关键词： Grain boundaries

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Cutting force modeling in high-speed machining of selective laser melted Ti6Al4V alloys based on a modified constitutive model considering thermally activated effect

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Science China(Technological Sciences) 2025年第3期68卷 138-155页

作者： Dejian LIU Chenbing NI Youqiang WANG Lida ZHU Zhongpeng ZHENG Wei LU Naixin ZHANG Xingbao HUANG School of Mechanical and Automotive Engineering Qingdao University of TechnologyQingdao266520China Key Lab of Industrial Fluid Energy Conservation and Pollution Control Ministry of EducationQingdao266520China School of Mechanical Engineering and Automation Northeastern UniversityShenyang110819China School of Mechanical Engineering Tsinghua UniversityBeijing100084China Shandong Zhongheng Jingxin Carbon Fiber Technology Development Co. LtdDezhou251100China State Key Laboratory of Bridge Safety and Resilience College of Civil EngineeringHunan UniversityChangsha410082China

The thermally activated effect can produce a vital influence on the mechanical property and cutting force of metal materials in the machining *** insight can be gained into the action criteria of the thermally activated effect on the cutting force,which provides a solid basis of the research of material performance and *** this study,a cutting force model of selective laser melted(SLMed)Ti6Al4V alloy is proposed by introducing the modified constitutive model with thermally activated effects and the analytical model of the deformation zone into the cutting force *** anisotropic properties of SLMed Ti6Al4V alloy under different scanning strategies(0°,67.5°,and 90°)are explored by combining with the cutting force model,constitutive model and analytical model of deformation zone(primary deformation and tool-chip contact area).The action of thermally activated effects on the cutting force,primary deformation and tool-chip contact zone is also researched in *** experiments and predictions of SLMed Ti6Al4V alloy under different scanning strategies have been implemented to reveal the effectiveness of this new *** comparison results indicate that the proposed milling force model can effectively predict milling force and reflect well on the anisotropy of SLMed Ti6Al4V *** addition,this proposed force model can well analyze the action mechanism of the thermally activated effect on the milling force of SLMed Ti6Al4V alloy,which is significantly essential for the machining mechanism research in terms of a microscopic perspective.

关键词： cutting force model modified constitutive model thermally activated effect SLMed Ti6Al4V alloy laser scanning strategies anisotropic properties

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