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Microstructure and mechanical properties of Ti/Al/Ti clad plates prepared via powder-in-tube method

Journal of Iron and Steel Research International 2024年第3期31卷 670-687页

作者： Xian-lei Hu Qin-cheng Xie Yi Yuan Ying Zhi State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819LiaoningChina Suzhou Dongbao Haixing Metal Material Technology Co. Ltd.Suzhou 215600JiangsuChina School of Material Science and Engineering Northeastern UniversityShenyang 110819LiaoningChina

The Ti/Al/Ti clad plates exhibit a broad spectrum of potential ***,the conventional techniques of hot-pressing composite and explosive composite are intricate and environmentally hazardous.A novel method was introduced for preparing clad plates,namely,the powder-in-tube *** method involves a combination of cold rolling,annealing at a temperature of 550℃,and double *** morphology of the intermetallic compound layer was analyzed through the utilization of interface stripping test,tensile test,and microscopic *** interface morphology,interface bonding properties,tensile fracture structures,and properties of plates under the first and second rolling were compared,along with the effects of intermetallic compounds on the interface *** results indicate that the powder-in-tube method,when annealed at 550℃,can produce a composite plate featuring a complete and uniform Ti/Al *** obtained plate exhibits a peeling strength of 21.5 N/mm,tensile strength of 424 MPa,and elongation of 11.5%.Furthermore,a systematic analysis was conducted to determine the causes of performance degra-dation observed during annealing at temperatures of 600 and 650℃.

关键词： Powder-in-tube method-Ti/Al/Ti clad plate Annealing Cold rolling-Mechanical property

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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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An Iterated Greedy Algorithm With Reinforcement Learning for Distributed Hybrid FlowShop Problems With Job Merging

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IEEE Transactions on Evolutionary Computation 2024年第3期29卷 1-1页

作者： Tao, Xin-rui Pan, Quan-ke Gao, Liang School of Mechatronic Engineering and Automation Shanghai University Shanghai China State Key Lab of Intelligent Manufacturing Equipment and Technology in Huazhong University of Science and Technology Wuhan China

The distributed hybrid flowshop scheduling problems (DHFSP) widely exist in various industrial production processes, and thus have received widespread attention. However, the existing research mainly focuses on inter-factory and inter-machine collaboration, but ignores collaborative processing between jobs. Therefore, this paper considers rescheduling DHFSP with job merging and reworking (DHFRPJM), and establishes a mixed integer linear programming model. The objective is to minimize the makespan. Based on problem-specific knowledge, a decoding heuristic and initialization strategy considering job merging are designed. An acceleration strategy based on critical path is adopted to save computational effort of iterated greedy algorithm. A local search strategy based on a deep reinforcement learning algorithm further improves the performance of the algorithm. Experimental results based on actual production data show that the proposed algorithm outperforms other algorithms in closely related literature. IEEE

关键词： Mixed-integer linear programming

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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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Effect of Zr Microalloying on Sulfide Stress Cracking Resistance in 125ksi Grade Oil Country Tubular Goods Steel

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JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE 2023年第5期32卷 2408-2416页

作者： Zhang, Si Wang, Ping Zhu, Fuxian Yang, Yulong Xiao, Bang Shi, Minghao Northeastern Univ Key Lab Electromagnet Proc Mat Shenyang 110819 Peoples R China Northeastern Univ State Key Lab Rolling & Automation Shenyang 110819 Peoples R China Shenyang Univ Technol Sch Mat Sci & Engn Shenyang 110870 Peoples R China

The effect of Zr addition on the sulfide stress cracking (SSC) resistance has been investigated for two experimental steels. Both experimental steels are undergone the identical heat treatment;however, experimental results disclosed that the strength and toughness of the Zr-steel are improved simultaneously (R-sigma = 913 MPa, A(KV) = 161 & PLUSMN;9 J), and the Zr-steel passed the experiment of NACE-A. The strength (R-sigma = 868 MPa), toughness (A(KV) = 86 & PLUSMN;3 J) and sulfide stress corrosion resistance (the fracture time of NACE-A is 72 h) of the Basic steel are relative worse. The mechanical property and SSC resistance are affected not only by the microstructures, but also the prior austenite grain size and the second phase particle. Besides, the average size of the prior austenite grain of the Zr-steel (6.47 & PLUSMN;0.2 mu m) is consistently smaller than that of the Basic steel (7.67 & PLUSMN;0.2 mu m), so as the final tempered martensite structure. The size of prior austenite grain is related to the high volume fraction of carbides and nitrides, working to pin the austenite gain. Moreover, the strengthening mechanism for SSC resistance by inclusion is discussed via fracture mechanics. The second particles caused by Zr is fine, which leads to the improvement in performance.

关键词： inclusions precipitates prior austenite grain sulfide stress cracking (SSC)

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Influence of vortex effect on the central segregation defects of horizontal twin-roll casting Al-Mg-Mn-Zn-Cu-Cr alloy sheet

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JOURNAL OF MATERIALS RESEARCH AND technology-JMR&T 2022年 19卷 1021-1036页

作者： Fu, Jinyu Xu, Jiujian Yu, Wei Mu, Xingwei Zhang, Jingyu Xu, Guangming Li, Yong Wang, Zhaodong Northeastern Univ Minist Educ Key Lab Electromagnet Proc Mat Shenyang 110819 Peoples R China Northeastern Univ State Key Lab Rolling & Automation Shenyang 110819 Peoples R China

In this paper, the formation mechanism of the vortex zone at different low cast-rolling speed was investigated elaborately with the aid of simulating flow field in cast-rolling zone. Additionally, the Influence of vortex effect on the central segregation defects of horizontal twin-roll casting (TRC) Al-Mg-Mn-Zn-Cu-Cr alloy sheet was analyzed in detail. The concrete results revealed that the area of the vortex zone shows an upward trend with decreasing cast-rolling speed, whereas the grain aspect ratio in the central area exhibits the reduction trend. The macro-segregation ratio of different elements at the vertex of the curve were also diminished when the cast-rolling speed decreases, due to the vortex effect can improve the nucleation rate and uniform the temperature field. More importantly, the presence of obvious valleys on both sides of the macro-segregation ratio curve, which fully proves the existence of vortex zones in the cast-rolling zone of the D2 and D3 cast-rolled sheets. Moreover, the values, uniformity and consistency of the hardness were significantly improved, mainly result from the vortex effect which enhances solid solubility of the alloy and improves the microstructural uniformity of sheet. While, the intensities of the shear textures and rolling texture of the cast-rolled sheet was notably enhanced with the gradual reduction of cast-rolling speed. Ultimately, the high alloying Al-Mg-Mn-Zn-Cu-Cr alloy cast-rolled sheet with excellent comprehensive properties was obtained.(c) 2022 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://***/licenses/by-nc-nd/4.0/).

关键词： Horizontal twin-roll casting High alloying Al-Mg-Mn-Zn-Cu -Cr alloy Central segregation defects Vortex effect Microstructure and mechanical properties

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Adaptive PI Control Based Stability Margin Configuration of Aircraft Control Systems with Unknown System Parameters and Time Delay

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Journal of Systems Science & Complexity 2024年第4期37卷 1507-1525页

作者： ZHANG Zhibing ZHOU Dapeng WANG Yeguang GAO Wanxin ZHANG Yanjun AVIC Shenyang Aircraft Design and Research Institute Shenyang 110035China School of Automation Beijing Institute of TechnologyBeijing 100081China State Key Lab of Autonomous Intelligent Unmanned Systems Beijing Institute of TechnologyBeijing 100081China

The stability margin is a vital indicator for assessing the safety level of aircraft control *** should maintain sufficient stability margin to ensure safety during flight,especially in the process of large maneuver *** stability margin is generally quantified by the Bode diagram,which strictly depends on the system parameters and the open-loop transfer ***,due to the uncertain flight environments,transmission delays of sensors and mode switchings,etc.,there exist large parameter and structure uncertainties in the aircraft control systems,which make it difficult to precisely configure the stability margin to the desired value by the usual control *** address this problem,an indirect adaptive control strategy is proposed in this paper,where an adaptive PI control law with the capability of self-configuration of stability margin is *** developed control law not only achieves stable time-varying command tracking in the time domain,but also is able to automatically configure the phase margin and gain margin in the frequency ***,the simulation of the one-degree-of-freedom roll rate control model of the air vehicle verifies the validity of the proposed control method.

关键词： Adaptive control aircraft control parameter uncertainty stability margin configuration

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Effect of low cast-rolling speeds on the microstructure and mechanical properties of twin- roll casting high Mg AA5059 alloy sheets

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JOURNAL OF MATERIALS RESEARCH AND technology-JMR&T 2022年 19卷 1059-1072页

作者： Fu, Jinyu Xu, Jiujian Zhang, Jingyu Xu, Guangming Li, Yong Wang, Zhaodong Northeastern Univ Key Lab Electromagnet Proc Mat Minist Educ Shenyang 110819 Peoples R China Northeastern Univ State Key Lab Rolling & Automation Shenyang 110819 Peoples R China

This study was undertaken to investigate the effect of low cast-rolling speeds (<15 mm/s) on the microstructure and the corresponding mechanical properties of twin-roll casting (TRC) high Mg AA5059 Al alloy sheets by metallographic microscopy (OM), scanning electron microscopy (SEM), electron back-scatter diffraction (EBSD), differential scanning calorimetry (DSC), and tensile testing. When low cast-rolling speeds were applied, the central segregation defects and micro-segregation defects disappeared significantly and the number of non-equilibrium eutectic phases abated remarkably. Nevertheless, the secondary dendrite arm spacing (SDAS) slightly increased and the degree of grain deformation in the core region of the cast-rolled sheet increased. The melt in the casting-rolling zone is in contact with the rolls for a longer period of time and the melt is also subjected to increased rolling force that together cause changes in the shape and depth of the sump in the twin-roll casting (TRC). Under the action of the change in the shape and depth of the sump, the temperature gradient along the thickness direction and the concentration gradient of the solute at the tip of the dendrite were significantly reduced and the solid solubility of the alloy was greatly improved. Eventually, the comprehensive mechanical properties of the high Mg AA5059 alloy sheet were enhanced.(c) 2022 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://***/licenses/by-nc-nd/4.0/).

关键词： Twin-roll casting AA5059 alloy Low cast-rolling speed Segregation defect Microstructure and mechanical properties

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Eutectoid Transformation Behavior in Oxide Scale of 960 MPa High Strength Steel 6

Eutectoid Transformation Behavior in Oxide Scale of 960 MPa ...

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6th International Conference on ThermoMechanical Processing, TMP 2022

作者： Wang, Hao Cao, Guangming Chen, Yingjian Liu, Zhenyu The State Key Lab of Rolling and Automation Northeastern University Shenyang110819 China

ISBN: (纸本)9787502492441

The eutectoid transformation behavior in the oxide scale of 960QT was studied in this paper. Thermogravimetric analysis (TGA) was employed to investigate the eutectoid reaction in the oxide formed on 960Qt after being exposed to air at 1000°C for 10 min. The oxidized specimens were held isothermally in Air from 1000 s to 15000 s in the temperature range from 300 to 550°C, and the morphologies in FeO were observed by EPMA. The experimental results show that after high temperature oxidation, the scale consists of the outermost layer of Fe2O3, the middle layer of Fe3O4, the inside of FeO and the alloy element enrichment layer near the substrate. As time extends, the content of proeutectoid Fe3O4increases gradually, and eutectoid phase transition begins to take place in FeO, forming lamellar Fe+Fe3O4. According to the TTT curve, the temperature range of isothermal eutectoid transformation of experimental steel grades is 400∼550°C, and its isothermal structural transformation behavior conforms to the law of the "C" curve, and the nose tip temperature is 450°C, A significant delay in eutectoid transition was compared to SPHC. The effects of alloying elements such as Mn, Cr and Si in 960QT on the eutectoid phase transformation of FeO were analyzed based on the experimental results. The Mn elements in the FeO is the main reason for the delay of the phase transition. © TMP 2022 - Proceedings. All rights reserved.

关键词： Thermogravimetric analysis

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Data-driven consensus control of fully distributed event-triggered multi-agent systems

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Science China(Information Sciences) 2023年第5期66卷 147-161页

作者： Yifei LI Xin WANG Jian SUN Gang WANG Jie CHEN School of Automation Beijing Institute of Technology The State Key Lab of Autonomous Intelligent Unmanned Systems Beijing Institute of Technology Beijing Institute of Technology Chongqing Innovation Center Department of Control Science and Engineering Tongji University

This study investigates the consensus control issue in discrete-time linear multi-agent systems(MASs) using data-driven control under undirected communication networks. To alleviate the communication burden, an adaptive event-triggered control strategy involving only local information is proposed and a model-based stability condition is derived that guarantees the asymptotic consensus of MASs. Furthermore,a data-based consensus condition for unknown MASs is established by combining a data-based system representation with the model-based stability condition, using only pre-collected noisy input-state data instead of the accurate system information a priori. Specifically, both model-based and data-driven event-triggered controllers can be utilized without requiring any global information. The validity and correctness of the controllers and associated theoretical results are demonstrated via numerical simulations.

关键词： distributed control event-triggered control data-driven control discrete-time MASs

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