نوع مقاله : مقاله یادداشت پژوهشی
نویسندگان
دانشگاه صنعتی سهند، دانشکده مهندسی مواد
چکیده
در این تحقیق جوشکاری فومهای آلومینیم خالص تجاری تولید شده به روش نورد تجمعی با استفاده از روش جوشکاری همزن اصطکاکی در سرعتهای چرخشی 500، 700، 900 و rpm1100 و سرعت خطی mm/min 25 بررسی شده است. تمامی جوشها به صورت بدون درز انجام شده است. برای بررسی درشت ساختار و سختی جوشهای انجام شده، متالوگرافی نوری و آزمون ریزسختی و به منظور تعیین درصد تخلخل فوم آلومینیمی و بررسی تغییرات چگالی ناحیهی جوش در سرعتهای چرخشی متفاوت از آزمون ارشمیدس استفاده شد. نتایج حاصل نشان دادند که در یک سرعت خطی ثابت، افزایش سرعت چرخشی ابزار سبب افزایش چگالی ناحیهی جوش شده و عیوب موجود در این ناحیه کاهش مییابد. همچنین نتایج حاصل از میکروسختی سنجی بیانگرافزایش سختی ناحیهی جوش در اثر افزایش سرعت چرخشی ابزار است.
کلیدواژه‌ها
عنوان مقاله [English]
Friction Stir Welding of Commercially Pure Aluminum Foams Manufactured by Accumulative Roll-Bonding Process
نویسندگان [English]
- Javad Mollaei Milani
- Tohid Saeid
Faculty of Materials Engineering, Sahand University of Technology
چکیده [English]
In present study friction stir welding of commercially pure aluminum foams manufactured by accumulative roll-bonding process was investigated at rotational speeds of 500, 700, 900 and 1100 rpm and advancing speed of 25 mm/min. All welds were carried out bead on plate. Optical microscopy and microhardness tests were used to investigate the weldments microstructure and weld regions hardness, respectively. Aluminum foam porosity and density variation of weld region at different rotational speeds were evaluated by Archimedes’ principle. Results showed that increasing rotational speed at a constant advancing speed causes an increase in weld region density and a decrease in weld defects. Moreover, microhardness results showed that increasing the rotational speed results in an increase in weld region hardness.
کلیدواژه‌ها [English]
- aluminum foam
- friction stir welding
- accumulative roll-bonding
- Banhart, J. Balumeister, "Production Methods for Metallic Foams", Fraunhofer-Institute for Applied Materials Research.
- C. Srivastava, K. L. Sahoo, " Processing, Stabilization and Applications of Metallic Foams", Materials Science-Poland, Vol. 25, No. 3, 2007.
- Kitazono, E. Sato, K. Kuribayashi, " Novel Manufacturing Process of Closed-Cell Aluminum Foam by Accumulative Roll-Bonding", ScriptaMaterialia 50 (2004) 495–498.
- Kitazono, Y. Kikuchi, E. Sato, K. Kuribayashi,“Anisotropic Compressive Behaviour of Al-Mg Alloy Foams Manufactured through Accumulative Roll-Bonding Process”, Materials Letters, Vol 61, pp. 1771-1774, (2007).
- Alizadeh, M. H. Paydar, “Fabrication of Al/SiCP composite strips by repeated roll-bonding (RRB) process”, Journal of Alloys and Compounds, Vol. 477, pp. 811– 816 (2009).
- Lu, K. Tieu, D. Wexler, “Significant enhancement of bond strength in the accumulative roll bonding process using nano-sized SiO2 particles”, Journal of Materials Processing Technology, Vol. 209, pp. 4830-4834, (2009).
- Banhart, " Aluminium Foams for Lighter Vehicles", Int. J. Vehicle Design, Vol. 37, Nos. 2/3, 2005.
- Banhart, “Manufacture, Characterization and Application of Cellular Metals and Metal Foams”, Progress in Materials Science, Vol. 46, pp. 559-632, (2001).
- J. Shiang, T.Y. Fong, Y. J. Bin, “Principal Component Analysis for Multiple Quality Characteristics Optimization of Metal Inert Gas
- H. Haferkamp, J. Bunte, D. Herzog, A. Ostendrof, “Laser Based Welding of Cellular Aluminum”, Science and Technology of Welding&Joining, vol.9, pp. 65-71, 2004.
- Kramer, F.Simancik, R.Florek, M. Nosko; K.Müllerová, P.Tobolka, O. Mishina, "FrictionStir Welding of Foamable Materials and Foam Core Sandwiches", Conference on Materials, Processes, Friction and Wear MATRIB’06, Vela Luka, 22-24.06.2006.
- Horn, "Friction Stir Welding of Aluminium Foam Materials", InstitutfürWerkstoffkunde und Schweißtechnik, D-20099 Hamburg.
- Hangai, S. Koyama, M. Hasegawa, T. Utsunomiya, "Fabrication of Aluminum Foam/Dense Steel Composite by Friction Stir Welding", Maetallurgical and Materials Transaction A, VOLUME 41A
- Hangai, K. Takahashi, T. Utsunomiya, S. Kitahara, O. Kuwazuru, N. Yoshikawa, “ Fabrication of Functionally Graded Aluminum Foam Using Aluminum Alloy Die Castings by Friction Stir Processing”, Materials Science and Engineering A, vol. 534, pp. 716-719, 2012.
- Alizadeh, M. H. Paydar, Study on the effect of presence of TiH2 particles on the roll bonding behavior of aluminum alloy strips, Materials and Design 30(2009)82–86.
- S. Mishra, Z.Y. Ma," Friction stir welding and processing", Materials Science and Engineering R 50 (2005) 1–78.
- Gurmeet Singh, Kulwant Singh, Jagtar Singh, "Effect of Process Parameters on Microstructure and Mechanical Properties in Friction Stir Welding of Aluminum Alloy", Trans Indian Inst Met (August–October 2011) 64(4–5):325–330.
)