Complex of properties of 2219 alloy weld joint in T62 state under modeling operating conditions
Heading:
| 1Nyrkova, LI, 1Labur, TM, 2Shevtsov, EI, 2Nazarenko, OP, 2Dorofeev, AV, 1Osadchuk, SO, 1Yavorska, MR, 1Poklyatsky, AG, 1Fedorchuk, VE 1E.O. Paton Electric Welding Institute of the National Academy of Sciences of Ukraine, Kyiv, Ukraine 2Yuzhnoye State Design Office, Dnipro, Ukraine |
| Space Sci. & Technol. 2022, 28 ;(2):14-29 |
| https://doi.org/10.15407/knit2022.02.014 |
| Publication Language: Ukrainian |
Abstract: A complex of properties of aluminium alloy 2219 welded joint, made by single-pass welding with a non-fusible electrode along and across the rolled product, and heat-treated to the state T62, in liquid amyl and its vapors at a temperature of 50 oC for 45 days was investigated. Characteristics of plasticity and strength of 2219 alloy welded joints are as follows: in the longitudinal (D) direction – yield strength of the welded joint is (301–317) MPa, of the base metal (295–297) MPa, strength limit of the welded joint (409–415) MPa, of the base metal (422–425) MPa, elongation is (4.0–5.8)% and (17.6–19.1)%, respectively; in the transverse (P) direction – the yield strength of the welded joint is (309–331) MPa, of the base metal (304–307) MPa, the yield strength of the welded joint (392–414) MPa, of the base metal (428–433) MPa, elongation is (2.1–3.3)% and (12.6–15.0)%, respectively. The strength coefficient of welded joints in the longitudinal direction is 0.96, in the transverse – 0.94.
Welded joints in the above environment are resistant to corrosion cracking and intergranular corrosion, resistance against exfoliating corrosion is evaluated by grade 2. Resistance of 2219 alloy in T62 state in amyl corresponds to the resistance group "stable", in amyl vapors – the group “highly resistant”. After aging in amyl and amyl vapors, the strength grades of the base metal samples and welded joints in both directions are almost unchanged, the plasticity parameters change ambiguously: the yield strength of the base metal increases by ~ (5–6)%, of welded joints decreases by ~ (6–7)%, the relative elongation of the base metal is reduced by ~ (5–16)%, of welded joints by about ~ 20%. Independently of the direction of welding relative to metal’s rolling, samples’ fractures are mostly viscous. After the exposing in amyl, the coefficient of the strength of welded joints in the longitudinal and transverse directions is the same and equal to 0.91, after the influence of amyl vapors, it is 0.95 in the longitudinal direction and 0.96 in the transverse direction. |
| Keywords: aluminum alloy 2219, corrosion resistance, heat treatment, mechanical properties, mechanical tensile fracture, microstructure, welded joints |
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4. GOST 9.904-82 Unified system of corrosion and ageing protection. Alluminium alloys. Accelerated test method for exfoliating corrosion, Moscow, Izd-vo standartov [in Russian].
5. GOST 9.021-74 Unified system of corrosion and ageing protection. Aluminium and aluminium alloys. Accelerated test methods for intercrystalline corrosion, Moscow, Izd-vo standartov [in Russian].
6. GOST 1497-84 Metals. Methods of tension test, Moscow, Izd-vo standartov [in Russian].
7. GOST 9.502-82 Unified system of corrosion and ageing protection. Inhibitors of metals corrosion for aqueous systems. Methods of corrosion tests (with changes № 1, 2) Izd-vo standartov [in Russian].
8. Ishchenko A. Ya. (2003). Aluminum high-strength alloys for weld structures. Progressive materials and technologies. Kiev: Academic periodica.
9. Ishchenko A. Ya., Labur T. M. (2013). Welding of modern structures from aluminum alloys. Kiev: Nauk. dumka.
10. Milman Yu. E., Korzhova N. P., Sirko A. I. (2008). Aluminum and its alloys. Inorganic materials science. Metals and technologies. Kiev: Nauk. dumka.
11. Bai J. Y., Yang C. L., Lin S. B., Dong B. L., Fan C. L. (2016). Mechanical properties of 2219-Al components produced by additive manufacturing with TIG. Int. J. Advanced Manufacturing Technology, 86 (1), 479—485.
https://doi.org/10.1007/s00170-015-8168-x
12. Chen S., Li F., Liu Q., Chen K., Huang, L. (2020). Effect of Post-aging Heat Treatment on Strength and Local Corrosion Behavior of Ultrafine-Grained 2219 Al Alloy. J. Materials Engineering and Performance, 29 (5), 3420—3431.
13. Gupta R. K., Panda R., Mukhopadhyay A. K., Kumar V. A., Sankaravelayutham P., George K. M. (2015). Study of aluminum alloy AA2219 after heat treatment. Metal Sci. and Heat Treatment, 57 (5), 350—353.
https://doi.org/10.1007/s11041-015-9888-0
14. Li H., Zou J., Yao J., Peng H. (2017). The effect of TIG welding techniques on microstructure, properties and porosity of the welded joint of 2219 aluminum alloy. J. Alloys and Compounds, No. 727, 531—539.
https://doi.org/10.1016/j.jallcom.2017.08.157
15. Lu Y., Wang J., Li X., Li W., Li, R., Zhou D. (2018). Effects of pre-deformation on the microstructures and corrosion behavior of 2219 aluminum alloys. Materials Sci. and Engineering: A, 723, 204—211.
https://doi.org/10.1016/j.msea.2018.03.041
16. Niu L.Q., Li, X.Y., Zhang L., Liang X.B., Li M. (2017). Correlation between microstructure and mechanical properties of 2219-T8 aluminum alloy joints by VPTIG welding. Acta Metallurgica Sinica (English Letters), 30 (5), 438—446.
17. Peng X. N., Qu W. Q., Zhang G. H. (2009). Influence of Welding Processes on Mechanical Properties of Aluminum Alloy 2219. J. Aeronautical Materials, 29 (2), 57—60.
18. Rao P. S., Sivadasan K. G., Balasubramanian P. K. (1996). Structure-property correlation on AA 2219 aluminium alloy weldments. Bull. Materials Sci., 19 (3), 549—557.
19. Rao S. K., Reddy G. M., Rao K. S., Kamaraj M., Rao K. P. (2005). Reasons for superior mechanical and corrosion properties of 2219 aluminum alloy electron beam welds. Materials characterization, 55(4-5), 345—354.
https://doi.org/10.1016/j.matchar.2005.07.006
20. Baskutis S., Bendikiene R., Ciuplys A. (2019). Effect of weld parameters on mechanical properties and tensile behavior of tungsten inert gas welded AW6082-T6 aluminium alloy. J. Mechanical Sci. and Technol., 33 (2), 765—772.
21. Wan Z., Meng D., Zhao Y., Zhang D., Wang Q., Shan J., Song J., Wang G., Wu A. (2021). Improvement on the tensile properties of 2219-T8 aluminum alloy TIG welding joint with weld geometry optimization. J. Manufacturing Processes, 67, 275—285.
https://doi.org/10.1016/j.jmapro.2021.04.062
22. Zhang D., Wang G., Wu A., Zhao Y., Li Q., Liu X., Meng D., Song J., Zhang Z. (2019). Study on the inconsistency in mechanical properties of 2219 aluminium alloy TIG-welded joints. J. Alloys and Compounds, 777, 1044—1053.
https://doi.org/10.1016/j.jallcom.2018.10.182
23. Zhang D., Wu A., Zhao Y., Shan J., Wan Z., Wang G., Song J., Zhang Z., Liu X. (2021) Effects of the Number of Welding Passes on Microstructure and Properties of 2219-C10S Aluminum Alloy TIG-Welded Joints. J. Materials Engineering and Performance, 1—10.
24. Zhang D. K., Wang G. Q., Wu A. P., Shan J. G., Zhao Y., Zhao T. Y., Meng D. Y., Song J. L., Zhang Z. P. (2019). Effects of Post-weld Heat Treatment on Microstructure, Mechanical Properties and the Role of Weld Reinforcement in 2219 Aluminum Alloy TIG-Welded Joints. Acta Metallurgica Sinica (English Letters), 32 (6), 684—694.
https://doi.org/10.1007/s40195-018-00869-w
25. Zhang D., Li Q., Zhao Y., Liu X., Song J., Wang G., Wu A. (2018). Microstructure and mechanical properties of three-layer TIGwelded 2219 aluminum alloys with dissimilar heat treatments. J. Materials Engineering and Performance, 27 (6), 2938—2948.
https://doi.org/10.1007/s11665-018-3394-7
26. Zhu Z. Y., Deng C. Y., Wang Y., Yang Z. W., Ding J. K., Wang D. P. (2015 (1980-2015)). Effect of post weld heat treatment on the microstructure and corrosion behavior of AA2219 aluminum alloy joints welded by variable polarity tungsten inert gas welding. Materials & Design, No. 65, 1075—1082.