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Strengthening and toughening mechanisms of martensite-bainite microstructure in 2 GPa ultra-high strength steel during hot stamping

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Science China Technological Sciences 2025年第5期68卷 19-33页

作者： Yanli SONG Ye LI Jue LU Lin HUA Yanfeng GU Yikuan YANG Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of Technology State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology

In response to the growing demand for energy efficiency, safety, and lightweight designs in new energy vehicles, this study addresses the challenge of balancing strength and toughness in ultra-high strength steel(UHSS) components produced by hot stamping. An innovative hot stamping process based on a martensite-bainite(M-B) complex-phase microstructure was proposed to enhance the strength and toughness of UHSS. The microstructural evolution of the M-B complexphase during the hot stamping process was investigated using commercial B1800HS steel. With a microstructure consisting of 87.4.% martensite, 8.7% lower bainite, and 3.9% film-like retained austenite by volume fraction, the steel achieved a tensile strength of 1944 MPa, total elongation of 9.66%, and impact energy of 25.8 J. Compared with conventional hot stamping, the strength of the material showed only a slight improvement, whereas elongation and impact energy were enhanced by approximately 53% and 32%, respectively. A quantitative relationship among process parameters, resulting microstructure, and mechanical properties was established. Optimization between strength and toughness was observed when the low bainite volume fraction ranged from 5.06% to 8.73%. The toughening mechanisms are attributed to the refinement of martensite lath bundles(width of 202 nm) facilitated by bainite formation, the increase in high-angle grain boundaries, and the presence of nanoscale retained austenite(width of 80 nm) between the laths. Additionally, the refinement of grains and the formation of nanoscale(Nb, Ti)C precipitates(diameter of 17 nm) further contributed to the overall strength. The developed M-B complexphase process, which involves medium-temperature slow cooling followed by rapid low-temperature quenching, provides an optimal combination of strength and toughness for a wide range of applications.

关键词： ultra-high strength steel hot stamping strengthening and toughening mechanisms martensite-bainite complex-phase microstructure

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A new multi-DOF envelope forming process for fabricating spiral bevel gears with back taper tooth

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Chinese Journal of Aeronautics 2025年第1期38卷 568-585页

作者： Xinghui HAN Yanhui WANG Lin HUA Wuhao ZHUANG Fangyan ZHENG Wei FENG Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of TechnologyWuhan 430070China Hubei Longzhong Laboratory Xiangyang 441000China

Spiral bevel gears are critical transmission components,and are widely used in the aerospace *** paper proposes a new multi-DOF envelope forming process for fabricating spiral bevel ***,the multi-DOF envelope forming principle of spiral bevel gears is ***,the design methods for the envelope tool geometry and movement are proposed based on the envelope geometry and movement ***,the metal flow and tooth filling laws are revealed through 3D FE simulation of the multi-DOF envelope forming process of a typical spiral bevel ***,a new method for separating the envelope tool and the formed spiral bevel gear with back taper tooth is proposed to avoid their ***,experiments on multi-DOF envelope forming of this typical spiral bevel gear are conducted using new heavy load multi-DOF envelope forming *** simulation and experimental results show the feasibility of the proposed multi-DOF envelope forming process for fabricating spiral bevel gears with back taper tooth and the corresponding process design methods.

关键词： Multi-DOF envelope forming Spiral bevel gear Back taper tooth Metal flow Process design

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Unveiling strength-plasticity synergic mechanism of AZ91 alloy during multi-DOF forming

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Journal of Materials Science & technology 2024年第28期195卷 80-92页

作者： Fang Chai Xinghui Han Zhiyuan Ma Lin Hua Xuan Hu Wuhao Zhuang Fangyan Zheng Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of TechnologyWuhan 430070China Hubei Longzhong Laboratory Xiangyang 441000China

High performance is of great importance to expand the application of magnesium alloys,and the inherent strength-plasticity synergic mechanism during a specific process should be *** this paper,a multi-degrees of freedom(multi-DOF)forming process is conducted on initially extruded AZ91 magnesium alloy at different deformation degrees,including small deformation with deformation amounts of 10%and 20%,medium deformation with deformation amounts of 30%and 40%,and large deformation with deformation amounts of 60%and 70%.Simultaneous enhancement of ultimate tensile strength(UTS)and plasticity is achieved in all these multi-DOF processed alloys in comparison to the initially extruded *** deformation degrees increase,both UTS and elongation of the multi-DOF processed alloy gradually increase in small and medium deformation and then slightly decrease in large deforma-tion,exhibiting a superior strength(401 MPa)and plasticity(16.3%)combination at deformation amount of 40%.The evolution of mechanical properties varying with deformation degrees is closely dependent on microstructure and texture *** microstructures of multi-DOF processed AZ91 alloy are increasingly refined and heterogeneous as deformation degrees gradually increase,which consist of the predominant equiaxed coarse grains(CGs)and a few fine grains(FGs)in small deformation,some CGs(equiaxed or slightly elongated)and some FGs in medium deformation,and some remarkably elongated CGs and the predominant FGs in large *** area fraction of basal texture gradually decreases while that of prismatic texture gradually increases with increasing deformation degrees,finally resulting in a complete disappearance of basal texture at a deformation amount of 70%.Thus,the strength-plasticity synergic mechanism related to increasingly obvious heterogeneous structure,gradually refined microstructure,and gradually decreased basal texture contribute to the constantly simultaneous improvement of UTS

关键词： AZ91 magnesium alloy Multi-degrees of freedom forming Strength-plasticity synergic mechanism Microstructure Texture

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Catalytic Performance of Carbon Smoke over Ag-LSCF Composite Catalysts

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Journal of Wuhan University of technology(Materials Science) 2025年第1期40卷 30-34页

作者： GUO Guanlun HAN Ming LU Shaomin YU Jing JU Hongling 无 Hubei Key Laboratory of Advanced Technology for Automotive Components&Hubei Collaborative Innovation Center for Automotive Components Technology Wuhan University of TechnologyWuhan 430070China College of Mechanical and Transportation Southwest Forestry UniversityKunming 650000China

To improve the catalytic performance of La_(0.6)Sr_(0.4)Co_(0.2)Fe_(0.8)O_(3)(LSCF)towards carbon soot,we utilized the impregnation method to incorporate Ag into the prepared LSCF *** conducted a series of characterization tests and evaluated the soot catalytic activity of the composite catalyst by comparing it with the LaCoO_(3) group,LaFeO_(3) group,and catalyst-free *** results indicate that the Ag-LSCF composite catalyst exhibits the highest soot catalytic activity,with the characteristic temperature values of 376.3,431.1,and 473.9℃at 10%,50%,and 90%carbon soot conversion,*** values are 24.8,20.2,and 23.1℃lower than those of the LSCF *** also shows that LSCF can improve the catalytic activity of soot after compounding with Ag,and reflects the necessity of using catalysts in soot combustion *** characterization and BET test show that Ag-LSCF has more abundant surface-adsorbed oxygen species,larger specific surface area and pore volume than LSCF,which also proves that Ag-LSCF has higher soot catalytic activity.

关键词： metallic composites carbon smoke oxidation perovskite catalyst soot

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Strength-plasticity matching regulation of cold rotary forged Al5A06 sheets by annealing treatment and its influence on fatigue property

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Journal of Materials Science & technology 2024年第25期192卷 123-148页

作者： Xuan Hu Xinghui Han Lin Hua Fang Chai Wuhao Zhuang Fangyan Zheng Fei Yin Xiaokai Wang Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of TechnologyWuhan 430070PR China Hubei Longzhong Laboratory Xiangyang 441000PR China

Al5A06 sheets by large cold plastic deformation usually have high strength but low plasticity,*** strength-plasticity matching,which may lead to their poor fatigue *** this study,annealing treat-ments are applied on cold rotary forged Al5A06 sheets to regulate strength-plasticity matching and im-prove fatigue *** microstructures,tensile mechanical properties and fatigue properties un-der different annealing parameters were *** abnormal grain growth mechanism of cold rotary forged Al5A06 sheets during 300℃ annealing treatment was investigated,and the fatigue failure mech-anism of Al5A06 sheets with different annealing temperatures was also *** abnormal grain growth during 300℃ annealing treatment is mainly due to the asynchronous recrystallization behavior with low recrystallization driving force,which leads to the early recrystallized regions directly absorb-ing adjacent grains along134crystal *** cold rotary forged Al5A06 sheets after 250℃-2 h annealing treatment exhibit the best fatigue property,which is mainly because the optimum strength-plasticity matching brings about coordinate plastic deformation throughout most grains,and the effective dislocation movement between adjacent grains can delay the appearance of strain localization and ac-commodate continuous fatigue cyclic loading.

关键词： Al5A06 sheets Cold rotary forging Annealing treatment Strength-plasticity matching Fatigue property

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Radial envelope forming mechanism and process design method for cylindrical rings with thin wall and high web ribs

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Chinese Journal of Aeronautics 2023年第12期36卷 461-476页

作者： Xinghui HAN Yanlei MIN Wuhao ZHUANG Lin HUA Duanyang TIAN Zushen DENG Ningbo LIU Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of TechnologyWuhan 430070China Hubei Longzhong LaboratoryXiangyang 441000China

Cylindrical rings with thin wall and high web ribs(CRTWHWR)are widely used as the key load bearing structures such as rocket body and space station cabin in aerospace ***,it is still difficult to efficiently manufacture CRTWHWR with high performance because of their extreme geometry with thin-walled skins,high web ribs and large *** this paper,a novel radial envelope forming process is put forward to efficiently achieve the plastic forming of CRTWHWR with high ***,the principle of radial envelope forming process is ***,an efficient design method for the tool motion and geometry is proposed based on the reverse envelope principle,i.e.,CRTWHWR is adopted to reversely envelope the tool and thus the tool which does not interfere with CRTWHWR can be efficiently obtained in a single ***,a reasonable 3D FE model of the radial envelope forming process of CRTWHWR is established and the radial envelope forming mechanism of CRTWHWR is comprehensively *** the FE simulation and experiments with material of plastic mud,a typical CRTWHWR with diameter of 300 mm,axial height of 192 mm,the maximum rib height of 25 mm,the minimum rib thickness of 3 mm and skin thickness of 5 mm is radial envelope formed,i.e.,the ratio of the maximum rib height to the minimum rib thickness reaches 8.33,the ratio of the maximum rib height to skin thickness reaches 5 and the ratio of diameter to the minimum rib thickness reaches *** above results verify that the proposed radial envelope forming process has great potentials in efficiently manufacturing CRTWHWR with extreme geometry.

关键词： Radial envelope forming Cylindrical ring with thin wall and high web ribs Forming mechanism FE simulation Tool design

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Phase-field lattice-Boltzmann study on fully coupled thermal-solute-convection dendrite growth of Al-Cu alloy

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China Foundry 2024年第2期21卷 125-136页

作者： Yin-qi Qiu Meng-wu Wu Xun-peng Qin Shou-mei Xiong Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of TechnologyWuhan 430070China Hubei Longzhong Laboratory Xiangyang 441000HubeiChina School of Materials Science and Engineering Tsinghua UniversityBeijing 100084China

Dendrite growth is a complex liquid-solid phase transition process involving multiple physical factors.A phase-field lattice-Boltzmann method was developed to simulate the two-and three-dimension dendrite growth of Al-Cu *** effect of fully coupled thermal-solute-convection interaction on the dendrite growth was investigated by incorporating a parallel-adaptive mesh refinement algorithm into the numerical *** accurately reproducing the latent heat release,solute diffusion and convective transport behaviors at the liquidsolid interface,the interaction mechanism among thermal-solute-convection transport as well as their coupling effects on the dendrite growth dynamics were *** simulation results show that the release of latent heat slows down the dendrite growth rate,and both natural and forced convection disrupt the symmetrical growth of *** combination makes the growth of dendrites more complex,capturing important physical aspects such as recalescence,dendrite tip splitting,dendrite tilting,dendrite remelting,and solute plume in the simulation *** on the robustness and powerful ability of the numerical model,the formation mechanisms of these physical aspects were revealed.

关键词： simulation phase field dendrite growth thermal-solute-convection interaction

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Bending Characteristics of Folded Multi-celled Tubes with Square and Circular Section Geometries

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Acta Mechanica Solida Sinica 2025年第1期38卷 125-141页

作者： Rui Liang Fengxiang Xu Zhen Zou Xiaoqiang Niu Xuebang Tang Tingpeng Li School of Automobile Engineering Guilin University of Aerospace TechnologyGuilin541004China Hubei Key Laboratory of Advanced Technology of Automotive Components Wuhan University of TechnologyWuhan430070China Hubei Collaborative Innovation Center for Automotive Components Technology Wuhan University of TechnologyWuhan430070China Academic Affairs Office Guilin University of Aerospace TechnologyGuilin541004China

This research investigates the bending response of folded multi-celled tubes(FMTs)fabricated by folded metal sheets.A three-point bending test for FMTs with circular and square sections is designed and *** base numerical models are correlated with physical experiments and a static crashworthiness analysis of six FMT configurations to assess their energy absorption *** influences of thickness,sectional shape,and load direction on the bending response are *** indicate that increasing the thickness of the tube and radian of the inner tube enhances the crashworthiness performance of FMT,yielding a 20.50%increase in mean crushing force,a 55.53%increase in specific energy absorption,and an 18.05%decrease in peak crushing force compared to traditional multi-celled tubes(TMTs).A theoretical analysis of the specific energy absorption indicates that FMTs outperform TMTs,particularly when the peak crushing force is *** study highlights the innovative and practical potential of FMTs to improve the crashworthiness of thin-walled structures.

关键词： Bending Folded Multi-celled tube Energy absorption Numerical

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Effect of Mn addition on microstructure and mechanical properties of GX40CrNiSi25-12 austenitic heat resistant steel

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China Foundry 2024年第3期21卷 205-212页

作者： Guan-yu Jiang Meng-wu Wu Xiao-guang Yang Hui Wang Yu-yuan Zhu Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of TechnologyWuhan 430070China Hubei Longzhong Laboratory Xiangyang 441000HubeiChina Wescast Industries(China)Co. Ltd.Wuhan 430100China

Three types of steels were designed on the basis of GX40CrNiSi25-12 austenitic heat resistant steel by adding different Mn contents(2wt.%,6wt.%,and 12wt.%).Thermodynamic calculation,microstructure characterization and mechanical property tests were conducted to investigate the effect of Mn addition on the microstructure and mechanical properties of the austenitic heat resistant *** show that the matrix structure in all the three types of steels at room temperature is completely *** NbC and M_(23)C_(6)precipitate at grain boundaries of austenite *** the increase of Mn content,the number of carbides increases and their distribution becomes more *** the Mn content increases from 1.99%to 12.06%,the ultimate tensile strength,yield strength and elongation increase by 14.6%,8.0%and 46.3%,*** improvement of the mechanical properties of austenitic steels can be explained by utilizing classic theories of alloy strengthening,including solid solution strengthening,precipitation strengthening,and grain *** increase in alloy strength can be attributed to solid solution strengthening and precipitation strengthening caused by the addition of *** improvement of the plasticity of austenitic steels can be explained from two aspects:grain refinement and homogenization of precipitated phases.

关键词： austenitic heat resistant steel manganese microstructure mechanical properties

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Microstructure inheriting evolution and strength-plasticity collaborative improvement mechanism of multidirectional rotary forged Al7075 sheets during T6 heat treatment

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Journal of Materials Science & technology 2024年第36期203卷 14-38页

作者： Xuan Hu Xinghui Han Lin Hua Jishi Zhang Jing Xu Fang Chai Wuhao Zhuang Fangyan Zheng Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of TechnologyWuhan 430070China Hubei Longzhong Laboratory Xiangyang 441000China School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China

Al7075 sheets are widely used in aerospace industry and their higher strength-plasticity collaborative improvement requirement is *** this study,the microstructure inheriting the evolution and me-chanical properties of Al7075 sheets during multidirectional rotary forging(MRF)and T6 heat treatment are *** results show that the average grain size exhibits near-parabolic evolution with increas-ing MRF deformation ***20%+T6(20%MRF deformation amount+T6)condition possesses the largest grain size of 72.6μm,and its abnormal grain growth mechanism is that the medium deformation energy and high deformation heterogeneity in MRF20%deformed grains could cause asynchronous re-crystallization behavior during T6 heat treatment,and the grains with comparatively higher deformation energy get recrystallized firstly and devour adjacent grains along preferred011or223misorientation ***70%+T6 condition possesses the finest grain size of 14.2μm,and its fine grain inheriting mech-anism is that the uniformly high deformation energy in MRF70%deformed grains causes uniformly rapid recrystallization,and rapidly recrystallized grains effectively suppress grain boundary motion from adja-cent *** increasing MRF deformation amount,tensile strength and elongation values both exhibit near-antiparabolic ***70%+T6 condition possesses the largest tensile strength(563 MPa)and elongation(17.73%),which increases by 8.27%and 80.55%compared to as-annealed+T6(MRF0%+T6)condition(tensile strength is 520 MPa and elongation is 9.82%),*** strength-plasticity col-laborative improvement is mainly because the combination of effectively inherited fine grains,refined inclusion particles,and uniformly distributed fineη’particles after T6 heat treatment could promote smooth dislocation movement and coordinated slip behavior in most matrix grains,which contributes to the delay of stress localization and strength-plasticity collaborative improvement.

关键词： Al7075 sheets Multidirectional rotary forging T6 heat treatment Microstructure inheriting evolution Strength-plasticity collaborative improvement

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