Journal of Stress Analysis

Journal of Stress Analysis

Analysis of Influences of Parameters on Hydrostatic Compressive Stress in Cyclic Extrusion Compression Angular Pressing for CP-Ti

Document Type : Original Research Paper

Authors
B. Pasoodeh 1
V. Alimirzaloo 1
M. Shahbaz 2
K. Hajizadeh 3
J. Alizadeh Kaklar 1
1 Department of Mechanical Engineering, Faculty of Engineering, Urmia University, Urmia, Iran
2 Department of Material Engineering, Faculty of Engineering, Urmia University, Urmia, Iran
3 Department of Mining and Metallurgical Engineering, Urmia University of Technology, Urmia, Iran
10.22084/jrstan.2023.27392.1233
Abstract
Cyclic extrusion compression angular pressing (CECAP) is a new severe plastic deformation method used to improve mechanical and metallurgical properties of metals. In this process, hydrostatic compressive stress has a considerable effect on the quality of the fabricated sample, where, as it rises, the probability of the appearance of the crack initiation on the sample is reduced. In this research, the effects of the process parameters of CECAP on magnitude and distribution of the hydrostatic compressive stress were investigated using finite element analysis (FEA) and response surface method (RSM). Temperature (T), input extrusion diameter (D), exit extrusion angle (α), frictional coefficient (µ), and longitudinal distance of input extrusion to extrusion compression angular pressing (ECAP) region (L) were selected as input parameters, and hydrostatic compressive stress (σ) was considered as response variable. Analysis of Variance (ANOVA) was extracted to evaluate the accuracy of the developed mathematical model and determine the significant factors. Results revealed that parameters of temperature and exit extrusion angle influence the hydrostatic compressive stress (σ) considerably. Also, the effect of interaction between the parameters is significant. The optical microstructure on the CECAPed section revealed that, for point C (center of section), the grain size is larger, reaching 3 μm, while for point A (near to outer surface), the grain size reaches 1.5 μm, showing that as it becomes near to the section, the grain size tends to be smaller. In order to verify the accuracy of the study, the hardness distribution behavior was compared by the strain distribution behavior obtained from finite element method (FEM). Moreover, the hydrostatic compressive stress of the current CECAP process was compared with other investigations and a significant improvement was observed. All experimental tests and the results of other investigations showed a good agreement with FEM results.
Keywords
CECAP process
OP observation
Hydrostatic compressive stress
Response surface method
Finite element analysis
CP-Ti
[1] R. Valiev, Y.Estrin, Z. Horita, T. Langdon, M. Zehetbauer, Y. Zhu, Fundamentals of superior properties in bulk nanoSPD materials, Materials Research Letters, 4(2016) 1-21.
[2] A. Azushima, R. Kopp, A. Korhonen, D. Yang, F. Micari, G. Lahoti, P. Groche, J. Yanagimoto, N. Tsuji, A. Rosochowski, Severe plastic deformation (SPD) processes for metals, CIRP Ann, 57(2008) 716-735.
[3] M. Aghaei Khafri, N. Golarzi, Dynamic and metadyanamic recrystallization of hastelloy X superalloy, journal of materials science, 43 (2008) 3717-3724.
[4] H.R. Rezaei Ashtiani, M. J. Ebrahimi, Investigate of microstructure evolution in hot extrusion for super alloy IN718, The tenth Conference of Manufacturing Engineering, anooshirvan university, babol, 2(2010) 34-44.
[5] Y. Chehrehsaz, K. Hajizadeh, A. Hadjizadeh, L. Moradi, S. Mahshid, Effect of ECAP on Physicochemical and Biological Properties of TiO2 Nanotubes Anodized on Commercially Pure Titanium, Metals and Materials International, 4 (2021) 67-78.
[6] K. Indira, U.K. Mudali, T. Nishimura, N. Rajendran, A Review on TiO2 Nanotubes: Influence of Anodization Parameters, Formation Mechanism, Properties, Corrosion Behavior, and Biomedical Applications, J. Bio. Tribo. Corros, 3 (2015) 1-28.
[7] S. Ahmadi, V. Alimirzaloo, G. Faraji, A. Donyavi, A New Modified Cyclic Extrusion Channel Angular Pressing (CECAP) Process for Producing Ultrafine-Grained Mg Alloy, Trans Indian Inst Met., 73(10) (2020) 2447–2456.
[8] K. Hajizadeh, B. Eghbali, Effct of Two-Step Severe Plastic Deformation on the Microstructure and Mechanical Properties of Commercial Purity Titanium, Met. Mater. Int. 20, 343 (2014).
[9] M. W. Richert Features of Cyclic Extrusion Compression: Method, Structure & Materials Properties, Solid State Phenomena, 114 (2006) 19-28.
[10] N. Pardis, B. Talebanpour, R. Ebrahimi, S. Zomorodian, Mater. Sci. Eng. A 528, 7537 (2011).
[11] S. Amani, G. Faraji, K. Abrinia, Microstructure and hardness inhomogeneity of fine grain AM60 magnesium alloy subjected to cyclic expansion extrusion (CEE), journal of manufacturing processes, 28 (2017) 197-208.
[12] Langdon T.G., Superplasticity in ultrafinegrained materials, Key Eng. Mater., 1994, 97(9): 109.
[13] J. Zhang, K.-S. Zhang, W. Hwai-Chung, M.-H. Yu, Experimental and numerical investigation on pure aluminium by ECAP, Trans. Nonferr. Met. Soc. China 19(5) (2009) 1303-1311.
[14] B.V. Patil, U. Chakkingal, T.P. Kumar, Influence of outer radius in equal channel angular pressing, World Academy of Science, Engineering and Technology. 62 (2010) 714-720.
[15] M. Ensafi, G. Faraji, H. Abdolvand, Cyclic extrusion compression angular pressing (CECAP) as a novel sever plastic deformation method for producing bulk ultrafine grained metals, Materials Letters, 197 (2017) 12-16.
[16] S. Ahmadi, G. Faraji, V. Alimirzaloo, A. Donyavi, Microstructure and Mechanical Properties of AM60 Magnesium Alloy Processed by a New Severe Plastic Deformation Technique, Metals and Materials International, 27 (2021) 2957-2967.
[17] H. Ataei1 , M. Shahbaz , H. S. Kim and N. Pardis, Numerical Analysis of Plastic Strain Inhomogeneity in Rectangular Vortex Extrusion (RVE) Process, Iranian Journal of Materials Forming 8(3) (2021) 46-52.
[18] Y. Iwahashi, J. Wang, Z. Horita, M. Nemoto, T.G. Langdon, Principle of equal-channel anulgar pressing for the processing of ultra-fine grained materials, Scr. Mater. 35(2) (1996) 143-146.
Journal of Stress Analysis
Volume 8, Issue 1
2024
Pages 69-81