Us20060549a1 continuous equal channel angular pressing. Using equalchannel angular pressing for the production of. Materials free fulltext microtensile behavior of mgal. Finite element method and upperbound type analysis of equal. Using equalchannel angular pressing for the production of superplastic aluminum and magnesium alloys cheng xu, zenji horita, minoru furukawa, and terence g. How to convert pdf to word without software duration. The process of equal channel angular pressing ecap, known also as equal channel angular extrusion ecae, was first introduced by segal and his coworkers in the 1970s and 1980s at an institute in minsk in the former soviet union. Pdf equal channel angular pressing technique for the. Modelling of equal channel angular pressing using a meshfree.
Equal channel angular pressing is one of the techniques in metal forming processes in which an ultralarge plastic strain is imposed on a bulk material in order to make ultrafine grained and. The equal channel angular pressing ecap is one of methods that has been used often by researchers. Microstructure and mechanical properties of pb4%sb alloy. It was found that the better grain size and orientation was obtained with the channel angle close to 90 degre yamashita et al 5 e. There has been also attempts to adapt this technique to continuous processing, enabling the production of materials in a large scale, efficient and cost effective manner4. Pdf hochgradige plastische umformung durch equal channel. The effectiveness of this technique is highlighted for modelling of one of the most popular spd techniques, equal channel angular pressing. Texture evolution in equalchannel angular extrusion. Equal channel angular pressing ecap has been shown to be a promising method for producing biocomposites from wood particles. However, severe plastic deformation during ecap would cause considerable cracking when consolidation is carried out without a binder. Finite element method is one of the important approaches to understand the deformation occurring in the ecap process. Equal channel angular pressing is one of the most prominent procedures for achieving ultrafine grain structures among the various severe plastic deformation techniques. Equal channel angular pressing an overview sciencedirect. Equal channel angular pressing ecap is a processing method in which a metal is subjected to intense plastic straining through simple shear without any corresponding change in the crosssectional dimensions of the sample 12.
Equal channel angular pressing technique for the formation. Compressive behavior and deformation kinetics of ultrafine. Influence of annealing on ductility of ultrafinegrained titanium processed by equalchannel angular pressingconform and drawing volume 3 issue 4 alexander v. Mar 30, 2006 read candidature of equal channel angular pressing for processing of tubular commercial puritytitanium, journal of materials processing technology on deepdyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips. Equal channel angular pressing of metallic powders for. Thus, for the further studies there was selected the. The deformation is mainly carried out by simple shear while the crosssection is maintained. Among the various severe plastic deformation techniques, equal. Equal channel angular pressing ecap is a processing method in which a metal is subjected to an intense plastic straining through simple shear without any corresponding change in the crosssectional dimensions of the sample. Equalchannel angular pressing ecap is the most prominent spd technique, due to its capability of producing bulk workpieces free of porosity and inclusions3. Influence of equal channel angular pressing on tribological.
Influence of annealing on ductility of ultrafinegrained. 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. Equal channel angular pressing ecap amir ghiasvand abaqus tutorial.
Particularly, ecap is an attractive processing method because it allows large bulk samples that are free from any residual porosity and are subject to minimal shape changes to be produced. Compressive behavior and deformation kinetics of ultra. Micro tensile deformation tests were performed at room temperature with the aim to reveal any plastic anisotropy developed during the extrusion. This procedure may be used to introduce an ultrafine grain size into polycrystalline materials. Grain refinement, thermal stability and tensile properties. Equal channel angular pressing ecap mohammad gharamohammadi. Dec 28, 2015 equal channel angular pressing ecap 1. The model employed to simulate the pressing for two consecutive passes. This is a very attractive feature for industrial superplastic forming applications. In this study, the effect of superimposing ultrasonic vibration on the punch during the equal channel angular pressing process was investigated by finite element model.
Severe plastic deformation spd by equal channel angular pressing ecap significantly affects the structure and properties of the material 1. This work presents the analysis of stresses required for a frictionless equal channel angular pressing ecap of perfectly plastic or strainhardening materials using finiteelement method and upperbound type analysis. You can publish your book online for free in a few minutes. Finite element simulation of equal channel angular pressing. Mechanical properties, texture and microstructural development by jens christofer werenskiold a thesis submitted to the norwegian university of science and technology ntnu in partial fulfilment of the requirements for the degree of doktor ingenior trondheim oktober 2004. Principles of equalchannel angular pressing as a processing. Equal channel angular pressing technique for the formation of.
Effect of equal channel angular pressing on the surface. Finite element analysis of ultrasonicassisted equal channel. A benchmark between sph and fe calculation is performed. Samples for micro tensile experiments were cut from extruded billets in different orientations with respect. The focus of this article is texture development in metals of fcc, bcc, and hcp crystal structure processed by a severe plastic deformation spd technique called equal channel angular extrusion ecae or equal channel angular pressing ecap. We also experimented on a copper alloy using the equal channel angular pressing technique to examine the microstructural, mechanical and hardness properties of the.
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 routes a and c. Equal channel angle pressing ecap of commercial purity aluminum 1050, oxygen free high conductivity copper ofhc cu and high purity tin 99,99% sn were conducted using c processing route. Plastic deformation through equal channel angular pressing mutiu f erinosho, member, iaeng, and esther t akinlabi, member, iaeng m proceedings of the world congress on engineering 2016 vol ii. Material model plays very important role in modeling the process. Effects of equal channel angular pressing with controlled back pressure ecapbp and subsequent upsetting on the formation of the texture, magnetic properties, and changes in the microstructure. Commercially available az31 magnesium alloy was four times extruded in an equal rectangular channel using three different routes a, b, and c. Mechanical properties and dislocation boundary mechanisms. In this study, the processing conditions were investigated for ecap of hardwood particles into bulk biocomposites without any additives. The second part of this work demonstrates that processing by ecap may be extended from conventional rod or bar samples to samples in the form of plates. Upperbound type and fem analysis were analytical approximations and numerical methods respectively. Equal channel angular pressing ecap is an emerging metal forming technique and a. Equal channel angular pressing of copper wire f djavanroodi.
Andreyachshenko et al initial porosity impact on equal channel angular pressing ecap metalurgija 55 2016 4, 775778 gree. In the ecap process of not only solid but also powder metals, knowledge of the density as well as internal stress, strain and strain rate distribution is important for understanding the process. Equal channel angular pressing ecap technique being the most prominent of spd techniques has been widely used for producing ultrafinegrained ufg metals and alloys. Effect of equal channel angular pressing on different face. Ecap equal channel angular pressing, one of the most promising method in spd, was used for the powder consolidation. Equal channel angular pressing how is equal channel angular. Processing of metals by equalchannel angular pressing.
A new development of equal channel angular pressing method to fabricate wireformed samples has been proposed and experimented. Senthil murugan assistant professor department of mechanical engineering mepco schlenk engineering college, india abstract. The principles of the ecap process are examined with reference to the. Pdf equal channel angular pressing of tubular samples. May 02, 2016 hochgradige plastische umformung durch equal channel angular pressing ecap hrsg prof. Parshikov r, rudskoy a, zolotov a, tolochko o 20 technological problems of equal channel angular pressing.
Pdf equal channel angular pressing of aluminium alloy. Horita z, fujinami t, nemoto m, langdon t 2000 equal channel angular pressing of commercial aluminum alloys. Equal channel angular pressing ecap is one of the most employed methods of severe plastic deformation spd. Evolution of microstructure and mechanical properties of ultrafinegrained interstitial free steel processed by equal channel angular pressing materials engineering materialove inzinierstvo 20 20 7176 73 at the same time the fraction of highangle boundaries reduced about 17 %. Horn design for ultrasonic vibrationaided equal channel. Keywords aluminum alloys, equalchannel angular pressing. As an alternative, a mesh free method called smoothed particle hydrodynamics sph is used. In ecap conditions, the billet is pressed through a steel matrix having two channels with the same cross section, intersecting at an angle.
817 498 1441 862 863 707 1213 791 753 1019 679 1236 706 1284 204 894 386 87 233 221 587 522 453 480 785 661 286 140 1622 1306 1002 559 532 1474 1161 739 722 374 1069 570 1066 629 461