Journals →  Tsvetnye Metally →  2021 →  #8 →  Back

MATERIALS SCIENCE
ArticleName The effect of forced cooling during friction stir welding on the structure and properties of 1565ChN116 aluminium alloy joints
DOI 10.17580/tsm.2021.08.08
ArticleAuthor Drits A. M., Ovchinnikov V. V., Solovieva I. V., Bakshaev V. A.
ArticleAuthorData

ARKONIK SMZ JSC, Moscow, Russia:

A. M. Drits, Director for Business and New Technology Development, Candidate of Technical Sciences, e-mail: dritsam@gmail.com

 

Moscow Polytechnic University, Moscow, Russia:
V. V. Ovchinnikov, Head of the Department of Materials Science, Doctor of Technical Sciences, Professor

 

NPO Mashinostroeniya Military & Industrial Corporation, Reutov, Russia:
I. V. Solovieva, Head of the Metallography and Mechanical Testing Laboratory

 

SESPEL Cheboksary Enterprise CJSC, Cheboksary, Russia:
V. A. Bakshaev, Director

Abstract

This paper describes the results of a study that looked at mechanical and corrosion performance of joints between 3 mm thick 1565ChН116 aluminium alloy sheets produced by friction stir welding in atmosphere and in water. It was established that a higher in-water cooling rate resulted in a higher tensile strength of the weld joint and slightly impacted its properties. It is the thermomechanical impact zone of the joint that sees fracture during tensile testing when aluminium alloy 1565ChН116 is friction stir welded in atmosphere and in water. The strength of such joint is 95 to 99% of the strength of the base metal. When conducting friction stir welding in water, the thermal impact zone is approximately 1.6 to 2.2 times shorter than when the process takes place in atmosphere. For the alloy 1565ChН116, friction stir welding conducted in water is associated with a 10 to 12% higher microhardness of metal in the thermomechanical impact zone and the stirring zone. The grain size in the stirring zone was observed to decrease from 6.8 to 4.5 μm. In this zone (the core of the joint), small angle boundaries account for approximately 15% of the total number of boundaries. This suggests that the structure mainly consists of equiaxed grains with large angle boundaries. A transmission electron microscopy study of foil obtained in the joint core area confirmed the results of phase and microtexture analysis (carried out by means of the EBSD technique) indicating that a recrystallized structure formed in the centre of the joint. A higher cooling rate during friction stir welding increases the intercrystalline corrosion resistance of all areas of the joint by approximately 1.4 to 1.7 times. The biggest increase in the intercrystalline corrosion resistance was observed in the thermal impact zone.

keywords Aluminium alloy 1565ChH116, friction stir welding, forced cooling of the joint, mechanical properties, grain size, intercrystalline corrosion
References

1. Hao H. L., Ni D. R., Huang H., Wang D., Xiao B. L. et al. Effect of welding parameters on microstructure and mechanical properties of friction stir welded Al – Mg alloy. Materials Science and Engineering: A. 2013. Vol. 559. pp. 889–896.

2. Drits A. M., Nuzhdin V. N., Ovchinnikov V. V., Konyukhov A. D. Investigation of fatigue life of base material and welds of 1565ch (1565ч) alloy sheets. Tsvetnye Metally. 2015. No. 12. pp. 88–93. DOI: 10.17580/tsm.2015.12.17.
3. Fridlyander I. N. Contemporary aluminium and magnesium alloys and composite alloys with them. Metallovedenie i termicheskaya obrabotka metallov. 2002. No. 7. pp. 9–17.
4. Oryshchenko A. S., Osokin E. P., Barakhtina N. N., Drits A. M., Sosedkov S. M. Aluminum-magnesium alloy 1565 ch (1565ч) for cryogenic application. Tsvetnye Metally. 2011. No. 11. pp. 84–90.
5. Drits A. M., Ovchinnikov V. V. Properties of aluminium casting alloy joints produced by friction stir welding. Tsvetnye Metally. 2020. No. 1. pp. 76–83. DOI: 10.17580/tsm.2020.01.11.
6. Srinivasa Rao Т., Madhusudhan Reddy G., Koteswara Rao S. R. Microstructure and mechanical properties of friction stir welded AA7075-T651 aluminum alloy thick plates. Transactions of Nonferrous Metals Society of China. 2015. Vol. 25. pp. 1170–1178.
7. Papahn H., Bahemmat P., Haghpanahi M. Study on govern ing parameters of thermal history during underwater friction stir welding. The International Journal of Advanced Manufacturing Technology. 2015. Vol. 78. pp. 1101–1111.
8. Srinivasa Rao Т., Madhusudhan Reddy G., Koteswara Rao S. R. Microstructure and mechanical properties of friction stir welded AA7075-T651 aluminum alloy thick plates. Transactions of Nonferrous Metals Society of China. 2015. Vol. 25. pp. 1170–1178.
9. Tarasov S. Yu., Rubtsov V. E., Eliseev A. A., Kolubaev E. A., Filippov A. V. et al. Influence of processing modes on defects in friction stir welded joints. Izvestiya vysshikh uchebnykh zavedeniy. Fizika. 2015. Vol. 58, No. 6-2. pp. 280–284.
10. Lukin V. I., Erasov V. S., Panteleev M. D., Avtaev V. V., Samorukov M. L. et al. Adoption of friction stir welding in application to airplane wing design. Svarochnoe Proizvodstvo. 2017. No. 6. pp. 44–48.
11. Kuritsyn D. N., Denisov L. V., Piskarev A. S., Boytsov A. G. The technology and special equipment for high-speed friction stir welding of steel structures. Proceedings of GOSNITI. 2016. Vol. 122. pp. 194–200.
12. Ishchenko A. Ya., Podjelnikov S. V., Poklyatskiy A. G. Friction stir welding of aluminium alloys: Review. Avtomaticheskaya svarka. 2007. No. 11. pp. 32–38.
13. Makarov E. L., Korolev S. A., Shtrikman M. M., Kashchuk N. M. Modelling of thermal processes during friction weelding. Svarka i diagnostika. 2010. No. 3. pp. 21–25.
14. V. A. Bakshaev, A. M. Drits, V. V. Ovchinnikov, M. V. Grigoriev. Method of friction welding with mixing of joints of aluminium alloys. Patent RF, No. 2686494. Applied: 12.10.2018. Published: 29.04.2019. Bulletin No. 13.
15. Srinivasa Rao T., Koteswara Rao S. R., Madhusudhan Reddy G. The microstructure and fracture of aluminium alloy АА7075-Т651 cooled down during friction stir welding. Metallovedenie i termicheskaya obrabotka metallov. 2019. No. 6. pp. 48–55.
16. Drits A. M., Ovchinnikov V. V., Vasiliev P. A. Understanding the structure and mechanical properties of friction stir welded Al – Cu – Mg joints. Tekhnologiya legkikh splavov. 2019. No. 4. pp. 17–25.
17. ISO 11699–1:2011. Non-destructive testing. Industrial radiographic film. Part 1. Classification of film systems for industrial radiography. Published: 30.11.2011.
18. GOST 6996–66. Welded joints. Methods of mechanical properties determination. Introduced: 01.01.1967. Moscow : Izdatelstvo standartov, 1966.
19. GOST R ISO 6705-1–2007. Metals and alloys. Vickers hardness test. Part 1. Introduced: 01.08.2008. Moscow : Izdatelstvo standartov, 2007.
20. GOST 9.021–74. Unified system of corrosion and ageing protection. Aluminium and aluminium alloys. Accelerated test methods for intercrystalline corrosion. Introduced: 01.01.1975. Moscow : Izdatelstvo standartov, 1974.
21. GOST 42333–77. Reagents. Sodium chloride. Specifications. Introduced: 01.01.1978. Moscow : Izdatelstvo standartov, 1977.
22. GOST 14261–77. Hydrochloric acid super pure. Specifications. Introduced: 01.017.1978. Moscow : Izdatelstvo standartov, 1977.
23. Liu H., Hu Y., Peng Ya., Chao D., Wang Z. The effect of interface defect on mechanical properties and its formation mechanism in friction stir lap welded joints of aluminum alloys. Journal of Materials Processing Technology. 2016. Vol. 238. pp. 244–254.

Language of full-text russian
Full content Buy
Back