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J Weld Join > Volume 32(2); 2014 > Article
Journal of Welding and Joining 2014;32(2):135-139.
DOI: https://doi.org/10.5781/JWJ.2014.32.2.9    Published online May 14, 2014.
Friction Stir Welding of 900MPa Grade TWIP Steel
Kwang-Jin Lee*, Sang-Hyuk Kim**, Eui-Pyo Kwon*, Kyu-Song Son**
Correspondence:  Kwang-Jin Lee,
Email: kjlee@kitech.re.kr
Friction stir welding (FSW) was successfully performed about 900MPa grade Twinning Induced Plastisity (TWIP) steel. A PCBN tool with convex-type shoulder was applied. Optimal process conditions were deduced. Microstructure and mechanical properties such as hardness, tensile strength and impact absorbed energy were observed and evaluated, respectively. An optical microscope (OM) and a field emission scanning electron microscope (FE-SEM) was selected for observing the grain structure.
Key Words: TWIP steel, FSW, Tensile strength, Hardness, Impact

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