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Si-Assisted Solidification Path and microstructure control of 7075 Aluminum Alloy with Improved Mechanical Properties by Selective Laser Melting

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Acta Metallurgica Sinica(English Letters) 2022年第9期35卷 1424-1438页

作者： Junwei Sha Meixian Li Lizhuang Yang Xudong Rong Bowen Pu Dongdong Zhao Simi Sui Xiang Zhang Chunnian He Jianglin Lan Naiqin Zhao School of Materials Science and Engineering and Tianjin Key Laboratory of Composites and Functional Materials Tianjin UniversityTianjin300350China Collaborative Innovation Center of Chemical Science and Engineering Tianjin300350China Key Laboratory of Advanced Ceramics and Machining Technology Ministry of EducationTianjin300350China Central Iron and Steel Research Institute(CISRI) Beijing100081China

The construction and application of traditional high-strength 7075 aluminum alloy(Al7075) through selective laser melting(SLM) are currently restricted by the serious hot cracking phenomenon. To address this critical issue, in this study, Si is employed to assist the SLM printing of high-strength Al7075. The laser energy density during SLM is optimized, and the eff ects of Si element on solidification path, relative density, microstructure and mechanical properties of Al7075 alloy are studied systematically. With the modified solidification path, laser energy density, and the dense microstructure with refined grain size and semi-continuous precipitates network at grain boundaries, which consists of fine Si, β-MgSi, Q-phase and θ-AlCu, the hot cracking phenomenon and mechanical properties are eff ectively improved. As a result, the tensile strength of the SLM-processed Si-modified Al7075 can reach 486 ± 3 MPa, with a high relative density of ~ 99.4%, a yield strength of 291 ± 8 MPa, fracture elongation of(6.4 ± 0.4)% and hardness of 162 ± 2(HV) at the laser energy density of 112.5 J/mm~3. The main strengthening mechanism with Si modification is demonstrated to be the synergetic enhancement of grain refinement, solution strengthening, load transfer, and dislocation strengthening. This work will inspire more new design of high-strength alloys through SLM.

关键词： Selective laser melting(SLM) 7075 aluminum alloy High-strength alloy microstructure control Solidification path

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Metallurgy and Solidification microstructure control of Fusion-Based Additive Manufacturing Fabricated Metallic Alloys:A Review

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Acta Metallurgica Sinica(English Letters) 2024年第1期37卷 29-53页

作者： Qiang Li Xing-Ran Li Bai-Xin Dong Xiao-Long Zhang Shi-Li Shu Feng Qiu Lai-Chang Zhang Zhi-Hui Zhang Key Laboratory of Bionic Engineering(Ministry of Education) and College of Bionic Science and EngineeringJilin UniversityChangchun130022China Institute of Structured and Architected Materials Liaoning Academy of MaterialsShenyang110167China Key Laboratory of Automobile Materials Ministry of Education and Department of Materials Science and EngineeringJilin UniversityChangchun130025China School of Mechanical and Aerospace Engineering Jilin UniversityChangchun130025China School of Engineering Edith Cowan University270 Joondalup DriveJoondalupPerthWA6027Australia

The metal-based additive manufacturing(AM),also referred to as metal 3D printing,has drawn particular interest because it enables direct creation,aided by computationally-directed path design,of intricate components with site-specific compositions and geometrical requirements as well as low buy-to-fly *** the last two decades,the objective of this revolutionary technology has been shifting from only“rapid prototyping”to advanced manufacturing of special high-end products or devices,which,in many aspects,outperform conventional manufacturing *** fusion-based AM,significant progress has been achieved in understanding the processing window of macroscopic scales,non-equilibrium metallurgy of mesoscale scales,and grain evolution of microscopic *** the versatile capacity of AM facilitates new avenues for discovering advanced materials and structures,their potential has still not been fully *** the unique non-equilibrium solidification during the AM process,coarse columnar grains with strong textures are usually developed along the build direction,which downgrades the mechanical *** push the limits of this digital manufacturing,this review attempts to provide in-depth and comprehensive overviews of the recent progress in understanding the evolution and control of the as-built microstructure that has been made recently and the challenges encountered during the AM process.

关键词： Additive manufacturing Temperature field microstructure control Nanoparticles Functionally graded materials

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THE DESIGN AND APPLICATION OF microstructure control SYSTEM APPLIED TO VEHICLES USING SHEET

THE DESIGN AND APPLICATION OF MICROSTRUCTURE CONTROL SYSTEM ...

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2006年中国机械工程学会年会暨中国工程院机械与运载工程学部首届年会

作者： LI Xincheng*, LUO Guanghong*, ZHU Weixing, ZHANG Yan*,ZHANG Jungao *School of mechanical engineering, Jiangsu Universty, Zhenjiang,Jiangsu, 212013,China School of electrical and information engineering, Jiangsu University, Zhenjing, Jiangsu, 212013, China ?Dongfeng Yueda Kia Motors Co. ,Ltd, Yancheng, Jiangsu, 224002, China

Fine microstructure and high mechanical properties are requested in vehicle using sheet. But the quality of sheet is very difficult to control given many influencing factors in the manufacturing proce

关键词： microstructure control optimal discrimination plane (ODP) partial Lest-Squares (PLS) ultrafine grain ferrite (Ffine).

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Grain refinement and strength enhancement in Mg wrought alloys: A review

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Journal of Magnesium and Alloys 2023年第11期11卷 4128-4145页

作者： Sen Wang Hucheng Pan Dongsheng Xie Dongdong Zhang Jingren Li Hongbo Xie Yuping Ren Gaowu Qin Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education) College of Materials Science and EngineeringNortheastern UniversityShenyang 110819China Liaoning Academy of Materials Institute of Materials PlanificationShenyang 110167China

Low absolute strength becomes one major obstacle for the wider applications of low/no rare-earth(RE) containing Mg alloys. This review firstly demonstrates the importance of grain refinement in improving strength of Mg alloys by comprehensively comparing with other strategy, e.g., precipitation strengthening. Dynamic recrystallization(DRX) plays a crucial role in refining grain size of Mg wrought ***, secondly, the DRX models, grain nucleation mechanisms and the related grain refinement abilities in Mg alloys are summarized,including phase boundary, twin boundary and general boundary induced recrystallization. Thirdly, the newly developed low-RE containing Mg alloy, e.g., Mg-Ce, Mg-Nd and Mg-Sm based alloys, and the RE-free Mg alloys, e.g., Mg-Al, Mg-Zn, Mg-Sn and Mg-Ca based alloy,are reviewed, with the focus on enhancing the mechanical properties mainly via the grain refinement strategy. At the last section, the perspectives and outstanding issues concerning high-performance Mg wrought alloys are also proposed. This review is meant to promote the deep understanding on the critical role of grain refinement in Mg alloys and provide reference for the development of other high strength and low-cost Mg alloys which are fabricated by the conventional extrusion/rolling processing.

关键词： Magnesium alloy Grain refinement Strengthening Dynamic recrystallization microstructure control

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Recrystallization model for hot-rolling of 5182 aluminum alloy

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中国有色金属学会会刊：英文版 2001年第3期11卷 382-386页

作者：张辉彭大暑杨立斌孟力平 Cent S Univ Dept Mat Sci & Engn Changsha 410083 Peoples R China

A recrystallization model for hot rolling of 5182 aluminum alloy was presented by means of the fractional softening during double interval deformation. It is found that the recrystallization rate depends on strain rate more sensitively than deformation temperature, and the time for full recrystallization is very short as strain rate is greater than 1?s -1 . Using the recrystallization—time—temperature curves, the desirable hot rolled microstructure can be obtained by controlling the rolling speed, temperature and cooling rate before cooling during the last pass in reversing mill.[

关键词： aluminum alloy hot rolling recrystallization modeling microstructure control

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Effect of Deformation Temperature on Deformation Mechanism of Fe-6.5Si Alloys with Different Initial microstructures

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Journal of Iron and Steel Research International 2016年第4期23卷 344-349页

作者： Hua-dong FU Yuan-ke MO Long-chao ZHUO Zhi-hao ZHANG Jian-xin XIE Institute for Advanced Materials and Technology University of Science and Technology Beijing School of Materials Science and Engineering Xi'an University of Technology

Deformation behaviors and mechanisms under different temperatures for columnar-grained Fe 6.5Si （mass%） alloys fabricated by directional solidification and equiaxed grained Fe-6.5Si alloy fabricated by forging were comparatively investigated. The results showed that, with increasing the deformation temperature from 300℃ to 500℃, the elongation increased from 2.9% to 30.1% for the equiaxed-grained Fe-6.5Si alloy, while from 6.6% to about 51% for the columnar-grained Fe-6.5Si alloy. The deformation mode of equiaxed-grained Fe 6.5Si alloy trans ferred from nearly negligible plastic deformation to large plastic deformation dominated by dislocation slipping. Comparatively, the deformation mode of the columnar grained alloy transferred from nearly negligible plastic deformation to plastic deformation dominated by the twining, and finally to plastic deformation dominated by dislocation slipping. Meanwhile, compared with the alloy with equiaxed grains, it was found that ultimate tensile strength and elongation could be increased simultaneously, which was ascribed for the twinning deformation in columnar-grained Fe-6.5Si al loy. This work would assist us to further understand the plastic deformation mechanism of Fe-6.5Si alloy and pro vide more clues for high-efficiency production of the alloy.

关键词： Fe-6.5Si alloy deformation behavior microstructure control mechanical property tensile deformation

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Selective sintering of magnesia-calcia materials by utilizing hot spots during induction sintering process

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Journal of Iron and Steel Research International 2024年第8期31卷 1914-1922页

作者： Yun-jie Dong Zhou-fu Wang Hao Liu Yan Ma Xi-tang Wang Nian Yi Zhong-feng Xia Yu-xuan Zhu Cheng-ji Deng Ling Zhang The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and TechnologyWuhan 430081HubeiChina School of Materials and Metallurgy University of Science and Technology LiaoningAnshan 110325LiaoningChina

Magnesia-calcia refractories are widely used in the production process of clean steel due to their excellent high-tem-perature stability,slag resistance and ability to purify molten ***,there are still problems such as difficult sintering and easy ***-calcia materials with various calcium oxide contents were prepared by using induction sintering,and the sintering property combined with the hydration resistance of the materials was *** experimental results showed that the magnesia-calcia materials prepared under induction field had higher density,microhardness and hydration *** particular,the relative density of induction sintered magnesia-calcia materials with 50 mo1%CaO was greater than 98%,and the average grain size of CaO was 4.56μm,which was much larger than that of traditional sintered *** order to clarify the densification and microstructure evolution mechanism of the magnesia-calcia materials,the changes in temperature and magnetic field throughout the sintering process were analyzed by using finite element *** results showed that the larger heating rate and higher sintering temperature under the induction sintering mode were beneficial to the rapid *** addition,the hot spots generated within the material due to the difference in high-temperature electric conductivity between MgO and CaO were the critical factor to realize selective sintering in MgO-CaO system,which provides a novel pathway to solve the problem of difficult sintering and control the microstructure of high-temperature composite material used in the field of high-purity steel smelting.

关键词： Magnesia-calcia material Induction sintering Hot spot Selective sintering Density microstructure control Hydration resistance

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Using multiple regression analysis to predict directionally solidified TiAl mechanical property

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Journal of Materials Science & Technology 2022年第9期104卷 285-291页

作者： Seungmi Kwak Jaehwang Kim Hongsheng Ding Xuesong Xu Ruirun Chen Jingjie Guo Hengzhi Fu National Key Laboratory for Precision Hot Processing of Metals School of Materials Science and EngineeringHarbin Institute of TechnologyHarbin 150001China Carbon Materials Application R&D Group Korea Institute of Industrial TechnologyJeonju 54853 Republic of Korea

The mechanical properties of TiAl alloy prepared by directional solidification were predicted through a machine learning algorithm *** composition,input power,and pulling speed were designated as input variables as representative factors influencing mechanical properties,and multiple linear regression analysis was conducted by collecting data obtained from the *** this study,the R^(2)value of the tensile strength prediction result was 0.7159,elongation was 0.8459,nanoindentation hardness was 0.7573,and interlamellar spacing was *** the R^(2)value of the elongation obtained through the analysis was higher than the R^(2)value of the tensile strength,it was confirmed that the elongation had a closer relationship with the input variables(composition,input power,pulling speed)than the tensile *** adding the elongation to the tensile strength as an input variable,it was observed that the R^(2)value was further *** tensile test prediction results were divided into four groups:The group with the lowest residual value(predicted value-actual value)was designated as group A,and the group with the largest residual value was designated as group *** comparing the values of group A and group D,more overpredictions occurred in group A,while more under predictions occurred in group *** the residuals and R^(2)values,the cause of the well-prediction was studied,and through this,the relationship between the mechanical properties and the microstructure was quantitatively investigated.

关键词： Directionally solidified TiAl alloy microstructure control Tensile strength Interlamellar space Prediction Multiple linear regression

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Recent developments in plastic forming technology of titanium alloys

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Science China(Technological Sciences) 2011年第2期54卷 490-501页

作者： YANG He FAN XiaoGuang SUN ZhiChao GUO LiangGang ZHAN Mei State Key Laboratory of Solidificatio. Processing School of Materials Sciece a.d E.gineering. Northwestern Polytechnical University Xi'an 710072 China

Titanium alloys have been used extensively in industry fields including aviation,aerospace and automobile due to their excellent comprehensive *** and development of advanced plastic forming technology are of great importance to manufacturing titanium products of high performance and lightweight with low cost and short *** paper analyzes the development tendencies of titanium alloy forming *** achievements in precision forming,microstructure control and multi-scale simulation of titanium alloys are *** forming techniques of large-sale integral complex components are presented.

关键词： titanium alloys precision forming microstructure control multi-scale simulation large-scale integral complex components

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Effect of growth rate on microstructure and microhardness of directionally solidified Ti-44Al-5Nb-1.5Cr-1.5Zr-1Mo-0.1B alloy

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China Foundry 2020年第4期17卷 293-300页

作者： Zhi-ping Li Hong-ying Xia Liang-shun Luo Bin-bin Wang Liang Wang Yan-qing Su Jing-jie Guo Heng-zhi Fu National Key Laboratory for Precision Hot Processing of Metals Harbin Institute of TechnologyHarbin 150001China

The effect of growth rates (V=2-50 μm·s-1) on microstructure and microhardness of directionally solidified Ti-44Al-5Nb-1.5Cr-1.5Zr-1Mo-0.1B (at.%) alloy at a constant temperature gradient (G=18 K·mm-1) was investigated. Results indicated that β phase was the primary phase of the directionally solidified Ti-44Al-5Nb-1.5Cr-1.5Zr-1Mo-0.1B alloy. As the growth rate increases, the solid/liquid interface turns from cellular growth to dendric growth. The interlamellar spacing (λs) decreases with the increase of growth rate according to the relationship of λs=3.39V -0.31. The solidification segregation occurs due to the enrichment of β-stabilizing element Nb, Cr in primary β phase during solidification;moreover, the degree of the segregation increases with the growth rate, resulting in the emergence of B2 phase in lamellar colonies at high growth rates. The microhardness (Hv) grows with the growth rate based on the equation of HV=328.69V 0.072, which mainly attributes to the microstructure refinement.

关键词： beta-solidifying TiAl alloys directional solidification microstructure evolution microstructure control microhardness

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