Article Periodicals » Materials Evaluation » Article
Experimental Study of Nondestructive Microstructural Characterization of Friction Stir Welded Joints

The objective of this work is to demonstrate the feasibility of microstructural characterization via nondestructive techniques. Ultrasonic velocity and attenuation techniques have been used to characterize the microstructural evolution of a cross section of a friction stir welded joint with a focusing immersion C-scan system. One-to-one correspondence was observed between the Vickers hardness and the ultrasonic parameters in quantitatively characterizing the microstructure. Both the velocity and attenuation distribution coincide well with the microstructural evolution. The maximum and minimum values of the attenuation curve can be used to nondestructively characterize the edges of the zones (base metal, heat-affected zone, thermo-mechanically affected zone and nugget) in the quantitative segmentation of the joints. The results also imply the feasibility of further application for quantitative analysis of joint and mechanical properties prediction.

Byeon, J.W., J.H. Song and S.I. Kwun, “Ultrasonic Evaluation of Creep Damage of High Temperature Metallic Materials with Different Microstructures,” Advances in Nondestructive Evaluation, Vols. 270–273, Parts 1–3, 2004, pp. 120–125. Cavaliere, P., “Effect of Friction Stir Processing on the Fatigue Properties of a Zr-Modified 2014 Aluminium Alloy,” Materials Characterization, Vol. 57, 2006, pp. 100–104. Ferreira, D.B.B., R.R. da Silva, J.M.A. Rebello and M.H.S. Siqueira, “Failure Mechanism Characterisation in Composite Materials Using Spectral Analysis and the Wavelet Transform of Acoustic Emission Signals,” Insight, Vol. 46, 2004, pp. 282–289. Ganesan, V., P. Palanichamy and B. Raj, “Elastic Modulus Determination as a Potential Tool for Predicting Embrittlement in a Ferritic Steel,” Materials Evaluation, Vol. 62, 2004, pp. 137–142. Hirao, M., H. Ogi, N. Suzuki and T. Ohtani, “Ultrasonic Attenuation Peak during Fatigue of Polycrystalline Copper,” Acta Materialia, Vol. 48, 2000, pp. 517–524. Hsu, C.H., H.Y. Teng and Y.J. Chen, “Relationship between Ultrasonic Characteristics and Mechanical Properties of Tempered Martensitic Stainless Steel,” Journal of Materials Engineering and Performance, Vol. 13, 2004, pp. 593–599. Kleiner, D. and C.R. Bird, “Signal Processing for Quality Assurance in Friction Stir Welds,” Insight, Vol. 46, 2004, pp. 85–87. Raj, B., V. Moorthy, T. Jayakumar and K.B.S. Rao, “Assessment of Microstructures and Mechanical Behaviour of Metallic Materials through Non-destructive Characterisation,” International Materials Reviews, Vol. 48, 2003, pp. 273–325. Sathish, S., K.V. Jata, R.W. Martin and R. Reibel, “Challenges in Detecting Damage in the Presence of Microstructural Inhomogenities in a Friction Stir Welded Aluminum Alloy for Reusable Cryotanks,” Conference on Health Monitoring and Smart Nondestructive Evaluation of Structural and Biological Systems V, San Diego, 2006, article 617703. Vasudevan, M. and P. Palanichamy, “Characterization of Microstructural Changes during Annealing of Cold Worked Austenitic Stainless Steel Using Ultrasonic Velocity Measurements and Correlation with Mechanical Properties,” Journal of Materials Engineering and Performance, Vol. 11, 2002, pp. 169–179. Vasudevan, M. and P. Palanichamy, “Assessment of Microstructure Stability of Cold Worked Ti-Modified Austenitic Stainless Steel during Aging Using Ultrasonic Velocity Measurements and Correlation with Mechanical Properties,” Journal of Nuclear Materials, Vol. 312, 2003, pp. 181–190. Zhu, J. and W.W. Cao, “Ultrasonic Attenuation and Velocity Changes in Multilayer Structures Containing Multiple Delaminations,” Materials Evaluation, Vol. 64, 2006, pp. 417–422.
Usage Shares
Total Views
12 Page Views
Total Shares
0 Tweets
0 PDF Downloads
0 Facebook Shares
Total Usage