Computational simulation of the equalchannel angular extrusion process. The proposed design is an improvement over the existing ones and has an additional attribute to process materials at high temperatures up to 500 o c. Lavanya textbook engineering metal engineering metal processing. In the present work, a new processing technique based. Equal channel angular pressing ecap is an effective process to produce materials. 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. Lavanya textbook engineering metal engineering metal processing metal structure. An equal channel angular extruding, twisting and deforming mold for large plastic forming process is disclosed. The equal channel angular extrusion ecae is a well known method for production of bulk materials with ultra fine grained structure 14. Design and fabrication of equal channel angular extrusion process analysis for nonferrous materials authors. Equal channel angular extrusion ecae is a significant method in industrial forming applications, which is the.
Production of dense compact billet from tialloy powder using. Equal channel angular pressing ecap is a technique used to increase the strength of materials by introducing severe plastic deformation through grains refinement. The mold is provided with a male mold 7 and a female mold, an inlet channel 8 and an outlet channel 9 communicated with a corner of the inlet channel 8 are arranged in the female mold. Equal channel angular extrusion the various procedures, equal channel angular pressing is an especially attractive processing technique for several reasons. Principles of equalchannel angular sheet extrusion ecase. In the present work, an extrusionequal channel angular extrusion execae process composed of two processes, extrusion and ecae, is developed. The purpose of this study is to numerically estimate the friction coef. Design and fabrication of equal channel angular extrusion process. Ebsd investigations of equal channel angular extruded copper. Pdf a new design for equal channel angular extrusion. Application of equal channel angular extrusion to semisolid.
Principles of equal channel angular sheet extrusion ecase. The simulation was carried out on 6063 aluminium alloy with a view to achieve ultrafine grain structures. 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. Investigating the mechanical properties of fcc structured. The simulation setup was used to conduct a parametric study involving varying the process parameters of ecae, aimed at aiding the process design. Design and fabrication of equal channel angular extrusion process analysis for nonferrous materials dr. 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. In the present work, a new processing technique based on ecae in.
Equal channel angular extrusion ecae is a promising novel technique for inducing microstructural refinement in polycrystalline materials by imposing large plastic strains. The process of powder compaction through equal channel angular extrusion ecae at room temperature was modeled using the finite element analysis package abaqus. Equal channel angular extrusion inl digital library. Lavanya author year 2016 pages 51 catalog number v342638 file size 3435 kb language english tags. The equal channel angular extrusion ecae is a well known method for production of bulk materials with ultra fine grained structure14.
Investigating the mechanical properties of fcc structured material processed by equal channel angular extrusion. The change in direction, without a change in billet dimensions. Production of dense compact billet from tialloy powder using equal channel angular extrusion final report 4062007 rimma lapovok and dacian tomus arc centre of excellence for design in light metals dept. In industrial metalworking, it is an extrusion process, the technique is able to refine the microstructure of metals and alloys, thereby improving their. Development of a submicrometergrained microstructure in aluminum 6061 using equal channel angular extrusion volume 12 issue 5 stephane ferrasse, vladimir m. Hartwig equal channel angular extrusion ecae has great potential for developing ultra. In addition, utilizing a manual press during ecap processing is. However, equal channel angular extrusion ecae is capable of repeatedly imparting a large amount of deformation into a material without significant dimensional changes. In contrast to rolling, drawing, extrusion the main purpose of ecap is to accumulate deformation in. The processing method of ecap includes pressing a billet. During the last decade, equal channel angular pressing. Equal channel angular extrusion ecae is one technique from the severe plastic deformation spd group, aimed at producing ultra fine grained ufg material.
The uniqueness of ecap is that fine grains are obtained without changing any of the dimensions of the sample. A new design for equal channel angular extrusion core. Equal channel angular extrusion simulation of highnb. Equalchannel angular pressing ecap or equalchannel angular extrusion ecae is one of the well approved technique that are used for the production of the polycrystalline materials with a grain diameter in the sub micrometre. Development of a continuous equal channel angular extrusion ecae process. Enhancement of mechanical properties of aa 6351 using.
Proceedings of the th international conference on metal forming. The technique is able to refine the microstructure of metals and alloys, thereby improving their strength according to the hallpetch relationship. The equal channel angular extrusion ecae is an ingenious severe plastic deformation process used to modify texture and microstructure without reducing sample crosssection. Equal channel angular extrusion ecae is a process used to introduce severe plastic deformations spd to processed materials with the aim of improving their mechanical properties by reducing the grain size. Characteristics of commercially pure aluminum 1020 deformed by equal channel angular through routes a and c s. Analysis of equal channel angular extrusion by upper bound. Microstructure evalution of equal channel angular extrusion. The cross section of the channel is equal on entry and exit. A new design for equal channel angular extrusion sciencedirect.
The process of ecap allows us to introduce very large plastic deformations to a workpiece without altering the overall geometry of the workpiece 1. First, it can be applied to fairly large billets so that there is the potential for producing materials that may be used in a wide range of structural applications. Application to ifsteel sheets 43 tional angular extrusion cfae 14 have been recently reported as continuous ecae processes to produce ufg sheet materials. Modeling texture and microstructural evolution in the equal. Design and fabrication of equal channel angular extrusion. Equal channel angular pressing ecap is an effective tool for producing ultra fine. Equal channel angular extrusion an overview sciencedirect topics. 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. Equal channel angular extrusion ecae is an extrusion process, developed in the early 1990s in the soviet union. The design has been tested for different materials at different temperatures and it.
In addition, the study emphasizes the design criterias ad failures of ecae. The equal channel angular extrusion simulation of ti44al8nbcr,mn,b,yat% alloy was investigated by using the deform3d software. Oct 26, 2015 in the present work, an extrusion equal channel angular extrusion execae process composed of two processes, extrusion and ecae, is developed. Numerical estimation of frictional effects in equal channel. Equal channel angular extrusion of aa 6063 using conventional. The complex deformation of the metal as it flows around the corner produces very high strain. Design, fabrication and manufacturing of 100 ton hydraulic. Twin parallel channel angular extrusion as a development of. The purpose of this study is to numerically estimate the friction coefficient for equal channel angular extrusion with and without back pressure. Equichannel angular pressingecap involves development of large simple. 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 friction, rheology of extruded material etc. In order to eliminate these shortcomings, some methods were developed including ecae in parallel channels. Shear deformation occurs in the material when it passes through the angular intersection connecting the two channels. Oyebanji abstract large uniform plastic strain has been effectively introduced in bulk materials using equal channel angular extrusion ecae process.
Enhancement of mechanical properties of aa 6351 using equal. Equal channel angular extrusion ecae is a relatively new metal working process which is capable of producing ultrafine submicron grain smg structure by means of intense plastic straining without a change in shape or dimensions of the worked material. In this paper, several topics on ecae of materials for potential automotive applications are briefly addressed. Equal channel angular extrusion ecae is now a wellestablished process for producing bulk materials with ultra. Equal channel angular extrusion processing of alloys for. Equal channel angular pressing ecap or equal channel angular extrusion ecae is one of the well approved technique that are used for the production of the polycrystalline materials with a grain diameter in the sub micrometre. Cn1025395a equal channel angular extruding, twisting and. Equal channel angular extrusion an overview sciencedirect. Modeling and analysis on deformation behavior for aa 6061. Equal channel angular extrusion of difficulttowork alloys. Equal channel angular extrusion for development of advanced. As a technique, equal channel angular pressing ecap is simple and. The present invention relates generally to methods for hot working metals and alloys for attaining selected microstructure, and more particularly to a method for producing homogeneous wrought microstructure during equal channel angular extrusion ecae of difficulttowork high temperature alloys.
Ecap equal chanel angular pressing is a novel method to get a submicron grain structure in metallic and intermetallic materials through intense plastic deformation by simple shear. Equal channel angular extrusion was performed at the idaho national engineering and environmental laboratory ineel. Because the cross section remains the same, a work piece can be extruded multiple times with each pass introducing additional strain. Equal channel angular extrusion ecae is a promising technique for obtaining ultragrained bulk materials with increased strength and ductility through severe plastic deformation 8,9. Investigation into channel angular extrusion and the uread. Severe plastic deformation by equal channel angular pressing. Pdf study on the extrusion load during equal channel. Texture evolution in commercially pure titanium after warm. Current advances in mechanical design and production vii, 2000. The proposed design is an improvement over the existing ones and has an additional. 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. 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. For the case of equal channel angular extrusionecae, the width of the vertical channel, b, becomes equal to the width of the horizontal channel, h. During the last decade, equalchannel angular pressing.
1171 919 1531 376 1054 344 1408 1002 973 156 689 106 1652 512 338 1647 491 1431 743 1013 1288 1504 845 1093 346 94 1273 571 1598 717 1537 1098 1116 1112 238 861 591 572 982