PSI - Issue 2_A

Toshifumi Kakiuchi et al. / Procedia Structural Integrity 2 (2016) 1007–1014 Author name / Structural Integrity Procedia 00 (2016) 000 – 000

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4. Conclusion

In this study, the dissimilar joints between the Al alloy A6061-T6 and the austenitic stainless steel type 304 were fabricated by a FSW technique and the fatigue crack propagation behavior was investigated. The main conclusions obtained in this study are summarized as follows: (1) The dissimilar Al/steel FSW joint of which the tensile strength was 194 MPa was fabricated with the welding condition of the rotating speed of 800 rpm and the tool offset of 0.2 mm. (2) The FCP rate in the intermetallic compound at the interface of the Al/steel FSW joint was measured successfully using a re-heat-treated CT specimen with a side-groove. (3) The FCP rates of the Al/steel FSW joint and that of the Al base metal were compared with respect to the nominal stress intensity factor range, Δ K , and the energy release rate range, Δ G . The relative differences between the FCP rates for the both materials are similar in the Δ K evaluation and in the Δ G evaluation. (4) The FCP rates of the Al/steel FSW joint were comparable or slightly faster than those of the Al base metal. Chen, T., 2009. Process Parameters Study on FSW Joint of Dissimilar Metals for Aluminum-Steel. Journal of Materials Science 44, 2573-2580. Mishra, R.S., Ma, Z.Y., 2005. Friction Stir Welding and Processing. Materials Science and Engineering R 50, 1-78. Ramesh Kumar, R., Jana, M.K., Venkateswara Rao, G., Anoop Kumar, K.S., 1997. Accurate Evaluation of Strain-Energy Release Rate in Unidirectional FRP Compact-Tension Specimen. Engineering Fracture Mechanics 58-3, 163-172. Suo, Z., Hutchinson, J.W., 1990. Interface Crack between Two Elastic Layers. International Journal of Fracture 43, 1-18. Uematsu, Y., Kakiuchi, T., Kondoh, E., Tozaki, Y., Ibrahim, I., 2013. Fatigue Behavior of Dissimilar A6061/Rolled Steel (SS400) Friction Stir Welds. Journal of the Japan Welding Society 31-2, 112-118. Xuan, F.Z, Tu, S.T., Wang, Z.D., 2005. A Modification of ASTM E 1457 C* Estimation Equation for Compact Tension Specimen with a Mismatched Cross-Weld. Engineering Fracture Mechanics 72, 2602-2614. Yasui, T., Mizushima, H., Tsubaki, M., Fujita, T., Fukumoto, M., 2014. Influence of tool shape on friction stir welded joint of aluminum and steel with circular weld line. Procedia Engineering 81, 2092-2097. References