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Microstructure evolution and mechanical properties at high temperature of selective laser melted alsi10mg

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Journal of Materials Science & Technology 2021年第3期62卷 162-172页

作者： Y.Cao X.Lin Q.Z.Wang S.Q.Shi L.Ma N.Kang W.D.Huang State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi’an 710072China Key Laboratory of Metal High Performance Additive Manufacturing and Innovative Design MIIT ChinaNorthwestern Polytechnical UniversityXi’an 710072China

In this study,the microstructure and tensile properties of selective laser melted alsilOmg at elevated temperature were investigated with focus on the interfacial ***-situ SEM and in-situ EBSD analysis were proposed to characterize the microstructural evolution with *** as-fabricated alsilOmg sample presents high tensile strength with the ultimate tensile strength(UTS)of~450 MPa and yield strength(YS)of~300 MPa,which results from the mixed strengthening mechanism among grain boundary,solid solution,dislocation and Orowan looping *** holding at the temperature below 200℃for 30 min,the micro structure presents little change,and only a slight decrement of yield strength appears due to the relief of the residual ***,when the holding temperature further increases to 300℃and 400℃,the coarsening and precipitation of Si particles inα-Al matrix occur obviously,which leads to an obvious decrease of solid solution *** the same time,matrix softening and the weakness of dislocation strengthening also play important *** the holding temperature reaches to 400℃,the yield strength decreases significantly to about 25 MPa which is very similar to the as-cast Al *** might be concluded that the YS is dominated by the matrix *** the softening mechanism counteracts work hardening,the extremely high elongation occurs.

关键词： Selective laser melting alsi10mg Microstructure In-situ EBSD High temperature tensile property

Design materials based on simulation results of silicon induced segregation at alsi10mg interface fabricated by selective laser melting

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Journal of Materials Science & Technology 2020年第11期42卷 145-155页

作者： Yuchengji Chaofang Dong Decheng Kong Xiaogang Li Beijing Advanced Innovation Center for Materials Genome Engineering Key Laboratory for Corrosion and Protection(MOE)Institute for Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijing 100083China

alsi10mg fabricated by selective laser melting(SLM)had a unique network-like silicon-rich structure,and the mechanism for its formation was explained by molecular dynamics(MD)*** effects of the silicon-rich phase and mg-containing structure on corrosion were studied by first-principles *** to the simulations,corrosion resistant materials were designed,samples with laser powers of 150 W,200 W and 250 W were *** results indicated that a local thermal gradient during laser printing caused Si segregation,and the rapid cooling rate lead to a large number of subgrains,which assisted *** difference in potential caused galvanic corrosion,and a structure with low work function in the molten pool caused *** corrosion resistance of materials processed with a high laser power increased.

关键词： alsi10mg Selective laser melting Atomistic simulation Material design Segregation Corrosion

Microstructure, porosity and mechanical properties of selective laser melted alsi10mg

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Chinese Journal of Aeronautics 2020年第7期33卷 2043-2054页

作者： Jing CHEN Wei HOU Xiuzhuan WANG Songlin CHU Zhiyi YANG Joint Laboratory of 3D Enable R&D Technology AECC Aero Engine Control System InstituteWuxi 214063China

Finite element modeling(FEM),microscopy,X-ray computed tomography(CT)and mechanical property tests were used to study the microstructure,porosity and mechanical properties of an alsi10mg alloy produced by selective laser melting(SLM).The simulation of the melt pool and thermal history under different energy densities produced an optimized result with an energy density of 44.5 J·*** high cooling rate during the SLM process significantly refined the previous a-Al *** growth direction of the network-like Al-Si eutectic structure at different orientations confirmed the anisotropic nature of the ***,the microhardness,tensile testing and fracture analysis results proved that there were no obvious distinctions in the strength between the transverse and longitudinal directions,and that the ductility was anisotropic,possibly due to the shape and distribution of the *** pores measured by X-ray CT at different energy densities confirmed that the sphericity of the pores was inversely related to pores *** optimized processing conditions,the porosity of the selective laser melted sample decreased leading to the improved fabricated fuel system component via SLM.

关键词： alsi10mg Mechanical property Microstructure Porosity Selective laser melting

Effect of Direct Aging on Corrosion Behavior of alsi10mg Alloy Fabricated by Laser Powder Bed Fusion

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Acta Metallurgica Sinica(English Letters) 2024年第2期37卷 266-282页

作者： Zhen Zhang Zhanyong Zhao Xiaofeng Li Beibei Wang Peikang Bai Shanxi Key Laboratory of Controlled Metal Solidification and Precision Manufacturing School of Materials Science and EngineeringNorth University of ChinaTaiyuan030051China Technical Center Taiyuan Iron and Steel(Group)Co.LtdTaiyuan030003China School of Materials Science and Engineering Taiyuan University of Science and TechnologyTaiyuan030024China

Effect of direct aging of 170℃on corrosion behavior of laser powder bed fused alsi10mg(LPBF-alsi10mg)was studied by microstructure analysis,electrochemical analysis and X-ray photoelectron *** results show that direct aging of 170℃has little effect on melt pool and Si cellular structure,but promotes the precipitation of nano-Si particles and releases the residual *** increasing aging time from 0 to 4 h to 24 h,the corrosion property of the LPBF-alsi10mg is deteriorated,which is evidenced by increased corrosion current density and decreased pitting potential and polarization *** increasing the aging time,the thickness of the oxide film formed on surface of the LPBF-alsi10mg *** Si content of the oxide film of the sample aging for 4 h is the lowest,9.42 at.%,and it is the highest,18.62 at.%,for the sample aging for 24 *** electrochemical noise analysis reveals that the middle-frequency contribution of the Hilbert spectrum is responsible for the deteriorated corrosion performance,which corresponds to metastable pitting initiated by nano-Si particles.

关键词： Laser powder bed fusion alsi10mg Direct aging Corrosion

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alsi10mg的激光选区熔化成形研究

金属学报 2017年第8期53卷 918-926页

作者：张文奇朱海红胡志恒曾晓雁华中科技大学武汉光电国家实验室武汉430074

利用激光选区熔化(selective laser melting,SLM)成形技术对Al Si10mg铸造铝合金的成形进行了工艺研究,获得了致密的成形,并对其沉积态和热处理态试样进行了静态拉伸性能测试和显微组织分析。结果表明:对于Al Si10mg,其SLM沉积态的常温... 详细信息

利用激光选区熔化(selective laser melting,SLM)成形技术对Al Si10mg铸造铝合金的成形进行了工艺研究,获得了致密的成形,并对其沉积态和热处理态试样进行了静态拉伸性能测试和显微组织分析。结果表明:对于Al Si10mg,其SLM沉积态的常温拉伸强度远高于铸件标准,延伸率与铸态相当;退火工艺对SLM试样的组织及力学性能有着重要的影响,随着退火温度的提高,试样微观组织发生改变,在300℃、2 h退火工艺下,原本均匀分布的颗粒状Si聚集长大为针状,使得试样的强度下降,延伸率升高。抗拉强度由沉积态的507~518 MPa下降到378~406 MPa,延伸率由沉积态的3.0%~3.5%增加到6.5%~9.5%。

关键词： alsi10mg 激光选区熔化力学性能热处理

alsi10mg选区激光熔化表面粗糙度预测、优化及表面形貌分析

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表面技术 2024年第15期53卷 129-140,151页

作者：惠记庄骆伟阎志强王俊杰吕景祥郭许张浩长安大学工程机械学院西安710064

目的选区激光熔化制造过程相当复杂,通过理论模型去研究表面粗糙度较为困难,因此采用数据驱动的方式进行研究是一种可行的方案。方法基于麻雀算法优化双向长短期记忆网络来预测表面粗糙度,并对比验证该模型的适用性。首先进行三因素四... 详细信息

目的选区激光熔化制造过程相当复杂,通过理论模型去研究表面粗糙度较为困难,因此采用数据驱动的方式进行研究是一种可行的方案。方法基于麻雀算法优化双向长短期记忆网络来预测表面粗糙度,并对比验证该模型的适用性。首先进行三因素四水平全因素试验,其次,以激光功率、扫描速度、扫描间距为输入,以粗糙度为输出,建立模型。然后,利用遗传算法优化预测模型,从而获得最佳工艺参数组合。最后,分析不同工艺参数下成形零件的表面形貌,探究各参数及其耦合关系对表面质量的影响。结果最佳工艺参数为扫描间距0.12 mm、扫描速度1800 mm/s、激光功率280 W,预测表面粗糙度为10.407μm,调整工艺参数进行实验,得到的样件的平均表面粗糙度为10.897μm,与预测值相比,误差仅为4.5%。工艺参数对表面形貌的影响从大到小的顺序为扫描速度、激光功率、扫描间距,各因素间存在耦合作用,且共同影响激光能量密度,能量密度过高、过低均会使表面形貌恶化。结论基于麻雀算法优化双向长短期记忆网络构建的数据驱动预测模型适用于粗糙度的预测与优化,能够实现对样件表面粗糙度的精准预测,可以指导实践,保证加工质量。

关键词：表面粗糙度选区激光熔化 alsi10mg 工艺参数优化表面形貌预测模型

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添加碳纳米管对选区激光熔化alsi10mg合金缺陷的影响

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稀有金属材料与工程 2019年第5期48卷 1637-1644页

作者：刘西河赵聪聪周鑫刘伟沈志坚 Florian Eibl Wilhelm Meiners 清华大学北京100084 空军工程大学陕西西安710038 斯德哥尔摩大学瑞典S-10691 弗劳恩霍夫激光技术研究所德国52074

利用选区激光熔化成形技术制备了纯alsi10mg合金及碳纳米管(carbon nanotubes,CNTs)-alsi10mg复合材料。当添加CNTs含量为0.05%(质量分数)时具有一定增强效果,但随着CNTs添加量增大,复合材料性能却因为缺陷的增加而明显下降。木实验利... 详细信息

利用选区激光熔化成形技术制备了纯alsi10mg合金及碳纳米管(carbon nanotubes,CNTs)-alsi10mg复合材料。当添加CNTs含量为0.05%(质量分数)时具有一定增强效果,但随着CNTs添加量增大,复合材料性能却因为缺陷的增加而明显下降。木实验利用纳米CT技术对纯合金及CNTs(0.5%)-alsi10mg复合材料进行缺陷的三维重构。结果表明,添加0.5%的CNTs后,成形缺陷体积所占比例由12%增加至46%;气孔型缺陷数量明显增加,并且等效直径相对较大。CNTs在粉体中的团聚及对气体的吸附作用是两种类型缺陷增加的根本原因。

关键词：选区激光熔化 alsi10mg 碳纳米管缺陷纳米CT

激光选区熔化2024改性alsi10mg合金

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中国有色金属学报 2022年第11期32卷 3257-3267页

作者：贾增庆高通王桂龙刘相法赵国群王协彬山东大学材料液固结构演变与加工教育部重点实验室济南250061 山东大学材料科学与工程学院济南250061

本文首先制备了含有1.5%(质量分数)TiC的2024铝合金粉末,并将其加入alsi10mg合金粉末中,形成alsi10mg-2024(TiC)混合粉末,然后采用激光选区熔化工艺对混合粉末成形,并对其沉积态和T6热处理态的显微组织及力学性能进行了表征。结果表明:... 详细信息

本文首先制备了含有1.5%(质量分数)TiC的2024铝合金粉末,并将其加入alsi10mg合金粉末中,形成alsi10mg-2024(TiC)混合粉末,然后采用激光选区熔化工艺对混合粉末成形,并对其沉积态和T6热处理态的显微组织及力学性能进行了表征。结果表明:激光选区熔化过程中2024铝合金中的TiC颗粒可作为异质形核点,促进Al形核,进而抑制粗大柱状晶的形成,显著细化铝合金的显微组织,并弱化了〈100〉//BD(Build direction,生长方向)丝织构的形成。经过T6热处理(520℃固溶2 h,190℃时效10 h)后,alsi10mg-2024(TiC)合金仍保持较高的力学性能,抗拉强度达到400 MPa。而经T6热处理后alsi10mg合金的强度仅为260 MPa。这是因为添加2024合金可以引入Cu元素,在时效过程中析出第二相粒子,强化铝合金基体。另外,时效过程中析出的纳米Si颗粒也可对T6热处理后的alsi10mg-2024(TiC)合金起到一定强化作用。

关键词：激光选区熔化增材制造铝合金 alsi10mg 2024铝合金

能量密度对激光选区熔化成形alsi10mg合金缺陷及力学性能的影响

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机械工程学报 2020年第24期56卷 96-105页

作者：闫泰起唐鹏钧陈冰清高祥熙楚瑞坤熊华平中国航发北京航空材料研究院3D打印研究与工程技术中心北京100095 飞而康快速制造科技有限责任公司无锡214145

分析了能量密度对激光选区熔化成形alsi10mg合金致密度的影响规律,并采用微纳CT检测结合EDS能谱分析的方法,统计了试样内部缺陷的类型和尺寸,分析了缺陷在试样三维层面上的分布规律及产生原因,得出了影响激光选区熔化成形alsi10mg合金... 详细信息

分析了能量密度对激光选区熔化成形alsi10mg合金致密度的影响规律,并采用微纳CT检测结合EDS能谱分析的方法,统计了试样内部缺陷的类型和尺寸,分析了缺陷在试样三维层面上的分布规律及产生原因,得出了影响激光选区熔化成形alsi10mg合金致密度和内部缺陷的主要因素。结果表明,合适的激光能量输入是获得高致密度的关键,当激光能量密度处于47.62~50.00 J/mm3区间时,试样致密度最高,此时试样中夹杂缺陷消失,孔洞缺陷最大尺寸降至0.056 mm。孔洞缺陷产生原因主要与未熔粉体、空心粉及氧化物有关。在优选激光能量密度区间内成形的alsi10mg合金试样,其平均抗拉强度和伸长率分别在294 MPa和8.0%以上,优于铸造alsi10mg合金。

关键词：激光选区熔化成形 alsi10mg 致密度孔洞缺陷拉伸性能