Influence of ECAR Processing on OFHC Cu Material Properties

Abstract

The influence of severe plastic deformation (SPD) on distribution of effective stresses, effective strains and temperatures during equal channel angular rolling (ECAR) process is mathematically simulated. Effect of ECAR processing on substructural and mechanical properties of oxygen free high conductivity (OFHC) Cu material is investigated too. Mathematical simulations in software DEFORM-3D, ECAR technology, tensile tests, EBSD analysis were used as experimental methods. Mathematical simulations of first ECAR pass referred on following results: effective normal stress had low heterogeneity with value 385 MPa, effective strain was distinguished with high heterogeneity in cross section of sample (φ=1,5-3) and temperature in deformation zone achieved value 150 °C. Mechanical properties after cold drawing were: Rp0,2 = 217 MPa, Rm = 260 MPa, Z = 63 % and after sixth ECAR pass were: Rp0,2 = 412 MPa, Rm = 426 MPa, Z = 72 %. From experiments is resulting the stabilization of mechanical properties after fourth ECAR pass were obtained.

Mechanical and Structural Properties of High Purity Al Processed by ECAP

“…Moreover, only limited levels of structural and strength--plastic characteristics can be obtained through conventional forming methods. An application of non--conventional forming methods [1,2] as well as severe plastic deformation (SPD), such as the most preferred methods of equal channel angular pressing (ECAP) and equal channel angular rolling (ECAR) technologies [3,4] could be the solution. They provide the possibility to obtain the UFG structure at the nm level.…”

Fracture Analysis and Local Mechanical Properties of Copper Processed by Ecar

“…The decreasing of can be depend on the ratio change high angle grain boundaries (HAGB) and low angle grain boundaries (LAGB) which was in as receive state HAGB/LAGB=72%/28%, however in the 1 st ECAR pass ratio was rapidly change to HAGB/LAGB=28%/72% [10,11]. The authors [6] described 13 th pass as faulted point in which elongated grains are change to more equilateral and also mechanisms of UFG formation are changing. Simultaneously, strain hardening and grain refinement took place which lead to increase in hardness.…”

“…However, these methods have been producing relatively small samples; moreover, ECAP is not effective in the industrial applications because it is a discontinuous process with low production efficiency and high cost [3]. The solution seems to be application of discontinuous technologies as an ECAE (equal-channel angular extrusion) [4], ECAP-Conform [3], ECAR [5,6] and others. The ECAR equipment was used in this study.…”

Influence of Reheating Conditions on Austenite Grain Growth

“…The conception of the steels based on C-Mn-Nb-V is characterized by the formation of precipitates such as VC, VN, NbC, NbN and/or Nb(C x ,N y ). The lost of drag effect of the precipitations results in the developed motion of austenite grain boundaries was discussed in [1][2][3][4][5][6][7][8][9]. The dissolution of VN and VC precipitates occurs at low reheating temperature in the range of 860-1000 ı C. According to the report [10], the dissolution of niobium precipitates occurs in the temperature range 1050-1200 ı C, whereby the general equation describing the dissolution on the thermo-dynamical base is in the form: a) a statistical model based on the numerical data processing of measured values using non-linear regression analysis [11] in form: The objective of this investigation is to find out the influence of reheating conditions on the average AGS growth by experiments with possibility of its mathematical description.…”