A new design for equal channel angular extrusion archive ouverte. The effect of equal channel angular extrusion ecae and. Equal channel angular extrusion how is equal channel. In addition, the study emphasizes the design criterias ad failures of ecae. Texture evolution in commercially pure titanium after warm.
Equal channel angular pressing ecap which is known as one of. Several variants of extrusion can be used for compaction of metal particulates, including the conventional extrusion ce and equal channel angular pressing ecap, often referred to as equalchannel angular extrusion. Finite element modeling the simulations were carried out using the finite element software. Pdf a new design for equal channel angular extrusion. The process of powder compaction through equal channel angular extrusion ecae at room temperature was modeled using the finite element analysis package abaqus. The processing method of ecap includes pressing a billet. This study investigates the effect of significant parameters on the equal channel forward extrusion pressing force. In the present work, a new processing technique based. Pdf analysis of equal channel angular extrusion by upper bound.
Analysis of hdpe behavior during two equal channels angular. The effect of equal channel angular extrusion ecae and boron additions on the mechanical properties of a biomedical tinbzrta tnzt alloy by gian a. Comparison of different extrusion methods for compaction of. The simulation results confirm the effectiveness of the taguchi robust design methodology in optimizing the eca extrusion process for the current ti6al4v titanium alloy topics. Equal channel angular extrusion ecae, is by far the most well studied and widely used spd technique to date. Design of titanium alloy equal channel angular extrusion. Equal channel angular extrusion ecae is now a wellestablished process for producing bulk materials with ultra. The equal channel angular extrusion simulation of ti44al8nbcr,mn,b,yat% alloy was investigated by using the deform3d software. The mechanics also specifies some basic process parameters. Equal channel angular extrusion ecae is a promising novel technique for inducing microstructural refinement in polycrystalline materials by imposing large plastic strains. In this paper, several topics on ecae of materials for potential automotive applications are.
Equal channel angular extrusion ecae is a significant method in industrial forming applications, which is the most important method for the production of ultrafine grained bulk samples, where plastic strains are introduced into the bulk material without any changes in. Simulation of equalchannel angular extrusion pressing. In industrial metalworking, it is an extrusion process, the technique is able to refine the microstructure of metals and alloys, thereby improving their. Hartwig equal channel angular extrusion ecae has great potential for developing ultra. In this paper, several topics on ecae of materials for potential automotive applications are briefly addressed. This paper employs the rigidplastic finite element fe deformtm 2d software to investigate the plastic deformation behavior of ti6al4v titanium. Design optimization of angular extrusion for severe plastic. The simulation process was done for al 5083 alloy using deform 3d software at two different channel angles 90 0 and 120 0 and with two distinct. Uniformity and continuity of effective strain in az91d processed by multipass equal channel angular extrusion zhang xiaohua, luo shoujing, du zhiming school of materials science and engineering, harbin institute of technology, harbin 150001, china received 29 january 2007. The design has been tested for different materials at different temperatures and it has shown the benefit of reducing the load requirement during pressing.
Ecap equal channel angular pressing is an inno vative process to obtain. Ecap process is the most conventional processing route developed via the severe plastic deformation process in the early 1980s by segal v. In the vertical channel, the billet moves as a rigid body while all deformation is localized in the small area around the channels meeting line. This metal forming process was invented by segal in the early 1970s 12. The equal channel angular extrusion ecae is an ingenious severe plastic deformation process used to modify texture and microstructure without reducing sample crosssection. The simulation setup was used to conduct a parametric study involving varying the process parameters of ecae, aimed at aiding the process design. Texture evolution in commercially pure al during equal channel angular extrusion ecae as a function of processing routes p. In order to eliminate these shortcomings, some methods were developed including ecae in parallel channels. The equal channel angular extrusion ecae is a well known method for production of bulk materials with ultra fine grained structure14. Design and fabrication of equal channel angular extrusion process analysis for nonferrous materials. Lavanya author year 2016 pages 51 catalog number v342638 file size 3435 kb language english tags.
This system helps create the solid model of a tooling set stepbystep using special parametric design tools. Twin parallel channel angular extrusion as a development of. The proposed design is an improvement over the existing ones and has an additional attribute to process materials at high temperatures up to 500 oc. Equal channel angular extrusion ecae is one technique from the severe plastic deformation spd group, aimed at producing ultra fine grained ufg material. Nonequal channel lateral extrusion necle is a new process that can be used to attain higher grain refinement in comparison with equal channel lateral extrusion ecle. A new design for equal channel angular extrusion sciencedirect. In this approach, wireformed specimen, which is inserted inside a polyurethane rubber pad material, has been pressed. Parameter analysis and optimization of equal channel angular pressing extrusion for titanium alloy using taguchi design of experiments method. Despite the simple design of ecae tool, the homogeneity of material flow, needed pressure and resulting strains are strongly influenced by a number of process parameters like tool geometry, external. Equalchannel angular extrusion of polymers springerlink.
Computational analysis of equal channel angular pressing for. Design and fabrication of equal channel angular extrusion process analysis for nonferrous materials authors. Selection of channel angle and corner angle 7khvhohfwlrqriwkhfkdqqhodqjoh n dqgwkhfrrner angle \ is very important while designing the equal channel. Starting in the 1990s, it quickly became well known as an effective technique for grain refinement of a coarsegrained polycrystalline metal , 14, 15. An alloy type a16060 was exposed to severe plastic deformation to study its reaction using the finite element method fem.
Design and fabrication of equal channel angular extrusion. However, the uniformity of the relative density depends on that of strain distribution and on the processing parameters. Abstract equal channel angular pressing ecap is a forming procedure. Proceedings of the th international conference on metal forming. Equalchannel angular extrusion ecae, is by far the most well studied and widely used spd technique to date. The proposed design is an improvement over the existing ones and has an additional attribute to process materials at high temperatures up to 500 c. This in turn, affects extrusion quality, and establishes and predicts optimal. Obtaining directly lsdyna output from ideas software, femb software read all. Texture evolution in commercially pure al during equal. Among these techniques equal channel angular pressing ecap developed by segal, twist extrusion te designed by beygelzimer and twist channel angular pressing tcap by kocich are the most promising techniques, where the shape and size of the component are retained even after several passes. The cross section of the channel is equal on entry and exit.
Simulation of a material undergoing equal channel angular. Beausir materials science and engineering a 2009, 520, pp. First, the process was modeled by finite element method and has been validated using experimental results. Parameter analysis and optimization of equal channel angular. Ecap, tubular channel angular pressing tcap, finite. Uniformity and continuity of effective strain in az91d. Langdonprinciple of equalchannel angular pressing for the. Simulation of a material undergoing equal channel angular process using finite element anallysis with marc s. A new development of equal channel angular pressing method to fabricate wireformed samples has been proposed and experimented. Development of a continuous equal channel angular extrusion ecae process. Equal channel angular extrusion simulation of highnb. Equal channel angular extrusion ecae is a simple process which is suitable to deform bulk materials into extremely large strains in order to achieve ultrafine grained ufg structures.
Microstructure evalution of equal channel angular extrusion. The paper presents the experimental results on an aluminum alloy and a silver alloy processed by equal channel angular extrusion in order to refine the grains. In the present work, a new processing technique based on ecae in. Segal 4 firstly introduced the equal channels angular extrusion ecae in 1977, which is identified as one of the proposed methods for structure miniaturization 5. Finite element simulation of pure aluminum processed by ecap.
Equal channel angular pressing of copper wire f djavanroodi. Analysis of equal channel angular extrusion by upper bound. Engineering and manufacturing flow dynamics fluid dynamics. Equal channel angular extrusion ecae is an extrusion process, developed in the early 1990s in the soviet union. The effects of material constitutive behavior, tooling design, and friction conditions on metal flow, stress fields, and the tendency for tensile fracture during equal channel angular extrusion ecae were established using a finite element modeling fem technique. Evolution of texture during equal channel angular extrusion of commercially pure aluminium. Texture evolution in equalchannel angular extrusion. Equal channel angular extrusion for development of advanced. Technological problems of equal channel angular pressing 27 fig. Several variants of extrusion can be used for compaction of metal particulates, including the conventional extrusion ce and equal channel angular pressing ecap, often referred to as equal channel angular extrusion. Equal channel angular pressing ecap is the most significant and attractive spd method in which the materials are extruded without any change in the cross section by subjecting to very large shear strain.
Modeling of equal channel forward extrusion force using. Research article by advances in materials science and engineering. Journal of simulation and analysis of novel technologies in mechanical engineering. Colombo a dissertation presented to the graduate school of arts and sciences of washington university in partial fulfillment of the requirements for the degree of doctor of philosophy. Equal channel angular extrusion progress report for march.1507 995 294 1599 870 1030 1587 1657 495 1174 1013 1363 239 422 415 315 1090 170 634 315 1660 10 1039 832 1392 15 156 1420 480 761 344 854 1012 1149 1201 865 1030 774 180 602 1181 1341 117 48 1163 1091 889