The Influence of Alloying Elements with Shape Memory Effect on Corrosion-Mechanical Properties of Welded Joints

Abstract:

The article contains analysis results of destruction of chemical generator corps representing thin-walled pressure vessels working under cyclic loading and in corrosive environments. It is shown that the corps made of steel 321 was destroyed mainly along the weld and heat affected zone. To improve the durability of corps we used materials with shape memory effect (SME) based on NiTi as alloying compound of welds. This allowed us to combine the functional properties of alloys with shape memory effect with increased mechanical, technological and operational properties. Accomplished electrochemical studies of corrosion behavior of steel 321 samples alloyed with NiTi in 3.5% NaCl solution, showed that the corrosion rate of welded joint and the base material are comparable. Fatigue tests in the environment KOH + H2 showed a significant reduction of ductility, which indicates the presence of hydrogen embrittlement. With increasing degree of hydrogenation the fatigue life of alloyed compounds drastically reduces.

• Periodical: Materials Science Forum (Volume 844)
• Pages: 13-18
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.844.13
• Online since: March 2016
• Authors: Zhesfina Blednova*, Igor Sergeevich Myshevsky, Yuriy Gavrilovich Blednov, Kirill Andreevich Zverkov
• Keywords: Alloying, Corrosion, Durability, Shape Memory Effect, Weld

References

[1] Zh.M. Blednova, N.A. Makhutov, Y.A. Kovalev, M.I. Chaevsky, On some design features of thin-walled pressure vessels of chemical power sources. Fiziko-Khimicheskaya Mekhanika Materialov. 29 (1993) 6 26-37.

[2] Zh.M. Blednova, N. A Makhutov, Y.A. Kovalev, M.I. Chaevsky, On certain design features of thin-walled pressure vessels for chemical battery systems. Materials Science. 29 (1993) 6 580-590.

DOI: 10.1007/bf00561632

[3] Zh.M. Blednova, I.S. Myshevsky, Structure and properties of welded joints produced using a filler material with shape memory. Welding International. 25 (2011) 4 297-300.

DOI: 10.1080/09507116.2010.540882

[4] Zh.M. Blednova, I.S. Myshevsky, The influence of alloying elements on the shape memory structure and performance properties of welded joints. Problems of Materials Science. 3 (2007) 118-125.

DOI: 10.4028/www.scientific.net/msf.844.13

[5] Zh.M. Blednova, I. S Myshevsky, The use of materials with shape memory effect to enhance the durability of thin-walled pressure vessels. The Samara Scientific Center RAS. 1 (2) (2010) 299.

[6] N. A Makhutov, Structural strength, resources and technological safety. Novosibirsk. Science. (2005) 494.

[7] N. Wangyang, D. Cheng, Recovery of Microindents in a Nickel-Titanium SMA: A Self-Healing, Effect. App. Phys. Lett. 80 (18) (2002) 3310-3312.

DOI: 10.1063/1.1476064

[8] Zh.M. Blednova, P.O. Rusinov, I.S. Myshevsky, Study of Micro-Mechanical properties of Alloyed Surface with TiNi Layer Considering Shape Memory Effect. Applied Mechanics and Materials. 704 (2015) 22-26.

DOI: 10.4028/www.scientific.net/amm.704.22

[9] Zh.M. Blednova, I.S. Myshevsky, P.O. Rusinov, Assessing the impact on the structure of iron alloys in Ni-Ti-Fe. Problems of Materials Science. 4 (2009) 17-24.