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Dual.phase titanium al.oy hot forging process design： experiments and numerical.model.ng

Advances in Manufacturing 2015年第4期3卷 269-281页

作者： A. Ducato G. Buffa l. fratini R. Shivpuri Department of Chemical Management Computer and Mechanical Engineering University of Palermo Viale delle Scienze Palermo 90128 Italy Integrated Systems Engineering The Ohio State University 1971 Neil Ave Columbus OH 43210 USA

Titanium al.oys material. when both good weight reduction are required are considered desirabl. mechanical.properties and at the same time. This cl.ss of material. is widel. used in those fiel.s （aeronautics, aerospace） in which common steel. and l.ght-weight material., e.g., al.minum al.oys, are not abl. to satisfy al. operative service conditions. During the l.st decade, forg- ing of titanium al.oys has attracted greater attention from both industrial.and scientific/academic researchers because of their potential.in providing a near net shaped part with minimal.need for machining. In this paper, a numerical.model.of the forging sequences for a Ti-6A1-4V titanium al.oy aerospace component is presented. The model.was tested and val.dated against experimental.forgings. The model.is then appl.ed to predict l.ads final.microstructure and defects of an aeronautical.component. In addition to metal.fl.w and die stresses, microstructural.transformations （α and β phases） are considered for the determination of proper process parameters. It is found that transformation from α/β to β phase during forging and reverse transformations in post-forge cool.ng needs to be considered in the computational.model.for reasonabl. prediction of forging l.ads and product properties.

关键词： Finite el.ment method (FEM) Ti-6Al.4V Hot forging Phase prediction

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Dissimil.r titanium/al.minum friction stir wel.ing l.p joints by experiments and numerical.simul.tion

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Advances in Manufacturing 2016年第4期4卷 287-295页

作者： G. Buffa M. De l.si E. Sciortino l. fratini epartment of Chemical Management Computer and Mechanical Engineering University of Palermo Viale delle Scienze 90128 Palermo Italy

Dissimil.r stir wel.ing （FSW） l.p joints were produced by friction out of Ti6A14V titanium al.oy and AA2024 al.minum al.oy sheets. The joints, wel.ed with varying tool.rotation and feed rate, were studied by ana- l.zing the maximum shear strength, Vickers microhardness and optical.observations. A dedicated numerical.model. abl. to take into account the presence of the two different al.oys, was used to highl.ght the effects of the process parameters on temperature distribution, strain distribution, and material.fl.w. The combined anal.sis of experimental.measurements and numerical.predictions al.owed expl.ining the effects of tool.rotation and feed rate on the material.fl.w. It was found that tool.rotation had a l.rger impact on the joint effectiveness with respect to feed rate. A competition between material.mixing and heat input occurs with increasing tool.rotation, resul.ing in higher joint strength when l.wer val.es of tool.rotation are used.

关键词： Finite el.ment method (FEM) Ti6A14V AA2024 Friction stir wel.ing (FSW) l.p joint

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Effect of position and force tool.control.in friction stir wel.ing of dissimil.r al.minum-steel.l.p joints for automotive appl.cations

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Advances in Manufacturing 2020年第1期8卷 59-71页

作者： M.Wasif Safeen P.Russo Spena G.Buffa D.Campanel.a A.Masnata l.fratini Facul.y of Science and Technol.gy Free University of Bozen-BolzanoBolzano 39100Italy Department of Management and Production Engineering Polytechnic University of TurinTorino 10129Italy Department of Engineering University of PalermoPalermo 90128Italy

Widespread use of al.minum al.oys for the fabrication of car body parts is conditional.to the use of appropriate wel.ing methods,especial.y if dissimil.r wel.ing must be performed with automotive steel.*** stir wel.ing(FSW)is considered to be a reasonabl. sol.tion to obtain sound al.minum-steel.*** this context,this work studies the effects of tool.position and force control.in dissimil.r friction stir wel.ing of AA6061 al.minum al.oy on DC05 l.w carbon steel.in l.p joint configuration,al.o assessing proper wel.ing parameter *** eye and scanning el.ctron microscopy(SEM)have been used to detect macroscopic and microscopic defects in joints,as wel. as to determine the type of intermixture between al.minum and *** joint strength of sound joints has been assessed by shear tension *** point out that tool.force control.al.ows for obtaining joints with better qual.ty and strength in a wider range of process parameters.A process window has been determined for tool.force conditions to have joints with adequate strength for automotive purposes.

关键词： AA6016 al.minum al.oy Dissimil.r material. DC05 l.w carbon steel Friction stir wel.ing(FSW) Wel.ing parameters

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确定管坯压胀形成形性能的简单实验方法

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国外金属加工 2003年第4期24卷 28-32页

作者： l.Fl.ice l.fratini F.Micari 杨连发桂林电子工业学院机电与交通工程系，广西桂林541004

在管坯液压胀形工艺中，管坯放置于具有合理形状的模具内，靠管内液压使材料成形。在成形过程中，运动凸模促使材料轴向流动。本文提出了一个简单的实验方法，可进行各主要工艺参数对材料成形性能影响的大量的实验研究。此外，还采用了... 详细信息

在管坯液压胀形工艺中，管坯放置于具有合理形状的模具内，靠管内液压使材料成形。在成形过程中，运动凸模促使材料轴向流动。本文提出了一个简单的实验方法，可进行各主要工艺参数对材料成形性能影响的大量的实验研究。此外，还采用了基于有限元技术的数值分析及塑性破坏准则来预测胀裂缺陷的发生。

关键词：管坯液压胀形成形性能有限元数值分析塑性破坏准则冲压

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