The Improvement of Mechanical Properties of the Incoloy 825 Weld Metal by Applying Electromagnetic Vibration
الموضوعات :
Ali Pourjafar
1
(Department of Materials Science and Engineering, Faculty of Engineering, Shahid Chamran University of Ahvaz, Ahvaz, Iran)
Reza Dehmolaei
2
(Department of Materials Science and Engineering, Faculty of Engineering, Shahid Chamran University of Ahvaz, Ahvaz, Iran; Steel Research Center, Shahid Chamran University of Ahvaz, Ahvaz, Iran)
الکلمات المفتاحية: Mechanical Properties, welding, Incoloy 825, Electromagnetic Vibration, dendrites fragmentation,
ملخص المقالة :
In this study, the effect of applying electromagnetic vibration simultaneously along with welding to improve the mechanical properties of the Incoloy 825 superalloy weld metal was investigated. The samples were welded by the GTAW method and the simultaneous application of electromagnetic vibration under voltages from zero to 30 volts. The impact toughness and hardness of the weld metals produced by different voltages were measured. The microstructure of base and weld metals was investigated by an optical microscope and SEM. Microstructural studies showed that the weld metal has a fully austenitic matrix with fine precipitates on the grain boundaries and within the grains. It was found that the application of electromagnetic vibration by the fragmentation of the dendrite tips and their entry to the weld metal molten pool contribute to the increasing of heterogeneous nucleation and therefore grain refinement. The result of impact and hardness tests depicted that by applying the electromagnetic vibration the impact toughness and hardness of the weld metal are increased from 27.7 to 35.3 jols and from 205.5 to 257.7 Vickers, respectively. It was found that electromagnetic vibration improves the hardness and impact energy of the weld metal by affecting the parameters, refined equiaxed dendrites, structure within grains and better distribution of precipitates.
[1] E. B. Howard and L. G. Timoty, Desk Edition, Metals Handbook, ASM International, United States of America,1985.
[2] E.F. Bradly, Superalloys A Technical Guide, 2nd Edition, ASM International, Metalspark, OH44073, 1988.
[3] M.J. Donachie, S.J. Donachie, Superalloys: a technical guide, 2nd Edition, ASM International, 2002.
[4] J. R. Davis et al, ASM Specialty Handbook: Nickel, Cobalt, and Their Alloys, Printed in the United States of America, 2000.
[5] R. Coppola, S. R. Fiorentin, Study of γ′-precipitation kinetics in alloy 800 at 575° C by small angle neutron scattering. Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 22, 4, 564-572, 1987.
[6] J. C. Lippold, Investigation of Weld Cracking in Alloy 800, Welding Journal, 63, 3, 91-103, 1984.
[7] R. S. Dutta, R. Purandare, A. Lobo and S. K. Kulkarni, "Microstructural Aspects of the Corrosion of Alloy 800”, Corrosion Science, 46, 2937–2953, 2004.
[8] K. Balasubramanian, S. Raghavendran1 and V. Balusamy., Studies on the effect of mechanical vibration on the microstructure of the weld metal. International Journal of technology and Engineering Systems, 2, 3,253-256, 2011.
[9] S. Kou, Welding metallurgy, second ed. Hoboken, John Wiley & Sons Inc, 2003.
[10] R. Dehmolaei, M. Shamaniana, A. Kermanpur. Effect of electromagnetic vibration on the unmixed zoneformation in 25Cr–35Ni heat resistant steel/Alloy 800dissimilarwelds, Materials Characterization, 59, 12, 1814-1817, 2008.
[11] A. Abugh, I. K., Kuncy., Microstructure and Mechanical Properties of Vibrated Castings and Weldments: A Review, Journal of Engineering Studies and Research 19(1) ,7, 2013.
[12] M. A. G. Dezfuli, Dehmolaei, R., & Zaree, S. R. A. (2019). Microstructural Aspects of 304 Stainless Steel Weld Joints with the Simultaneous Application of Electromagnetic Vibration., Metallography, Microstructure, and Analysis, 8(2), 226-232.
[13] M. Nabahat, Ahmadpour, K., & Saeid, T. (2018). Effect of ultrasonic vibrations in TIG welded AISI 321 stainless steel: microstructure and mechanical properties. Materials Research Express, 5(9), 096509.
[14] P. Singh, Patel, D., & Prasad, S. B. (2017). Investigation on the effect of vibrations on cooling behavior and mechanical properties of SMAW butt welded joints. Sci. Bull. Ser. D, 79.
[15] A. V. D. Queiroz, Fernandes, M. T., Silva, L., Demarque, R., Xavier, C. R., & Castro, J. A. D. (2020). Effects of an external magnetic field on the microstructural and mechanical properties of the fusion zone in TIG welding. Metals, 10(6), 714.
[16] P. Sakthivel, & Sivakumar, P. (2014). Effect of vibration in Tig and arc welding using AISI 316 stainless steel. International Journal of Engineering, Research and Science & Technology, 3(4), 116-130.
[17] Y. Sharir, Pelleg, J., & Grill, A. (1978). Effect of arc vibration and current pulses on microstructure and mechanical properties of TIG tantalum welds. Metals Technology, 5(1), 190-196
[18] R. Dehmolaei, M. Shamaniana, A. Kermanpur, Microstructural characterization of dissimilar weld between alloy 800 and HP heat resistant steel,59,10, 1447-1454, 2008.
[19] D.Y. Seo, J. Tsang1, R. Kearsey, W.J. Yang2, K.S. Cho, J.H. Lee, and P. Au1, Crack Growth Rate Behaviour and Microstructural Features of Incoloy 800H under Fatigue and Creep-fatigue Conditions, In ICF12, Ottawa 2009.
[20] M. Sireesha, V. Shankar, SK. Albert, S. Sundaresan, Microstructural features of dissimilar welds between 316LNaustenitic stainless steel and Alloy 800, Mater Sci Eng A, 292:74–82, 2000.
[21] L. Sundar and D. R. G. Achar, Review of Weld Cracking in Alloy 800, Indian Welding Journal., 16, 3, 81-86, 1984.
[22] R. Dehmolaei, M. Shamaniana, A. Kermanpur, Microstructural changes, and mechanical properties of Incoloy 800 after 15 years’ service, Materials Characterization 60, 3, 246-250, 2009.
[23] C.C. Hsieh, P.S. Wang, J.S. Wang, W. Wu. Evolution of microstructure and residual stress under various vibration modes in 304 stainless steel welds. The Scientific World Journal. 2014 Jan 1;2014.
[24] S. P. Tewari, Influence of Longitudinal Oscillation on Tensile Properties of Medium Carbon Steel Welds of Different Thickness, Science & Technology Asia 14, 4, 17-27, 2009.
[25] Y. G. Zhao, Y. H. Liang, Q. D. Qin, W. Zhou and Q. C. Jiang, Effect of Mechanical Vibration on the Microstructure, Impact Toughness and Thermal Fatigue Behavior of Cast Hot Working Die Steel, ISIJ international 44 (7), 1167-1172, 2004.
[26] J. Prakash, S.P. Tewari, B.K. Srivastava, Nucleation, grain growth, solidification and residual stress relaxation under stationary and vibratory welding condition—A review. Int. J. Engg. Techsci. 1, 1, 2010.
[27] C. Zhang, M. WU, J. DU, Improving Weld Quality by Arc-Excited Ultrasonic Treatment, Tsinghua Science and Technology, 6, 5, 475-478, 2001.
[28] B. Pucko, V. Gliha., Charpy toughness of vibrated microstructures. Metalurgija., 44, 2, 103-106, 2005.
[29] S. Kou, Y. Le., Improving weld quality by low frequency arc oscillation., Welding Journal 64, 3, 51-55, 1985.
[30] D. Facchini, (2012). Biomedical nanocrystalline metals and alloys: Structure, properties and applications. In Nanomedicine (pp. 36-67). Woodhead Publishing.
[31] Y. Mizutani; Y. Ohura, K. Miwa., Effect of the Electromagnetic Vibration Intensity on Microstructural Refinement of Al-7%Si Alloy., Materials Transactions, 45, 6, 2004.
[32] T.Y. Kuo, H.T. Lee, Effects of filler metal composition on joining properties of alloy 690 weldments, Materials Science and Engineering A, 338,202-212, 2002
