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http://dx.doi.org/10.9726/kspse.2014.18.2.062

Marco and Microscopic Observations of Fatigue Crack Growth in Friction Stir Welded 7075-T651 Aluminum Alloy Plates  

Kong, Yu-Sik (A+ LINC, Pukyong National University)
Kim, Seon-Jin (Department of Mechanical & Automotive Engineering, Pukyong National University)
Publication Information
Journal of Power System Engineering / v.18, no.2, 2014 , pp. 62-69 More about this Journal
Abstract
In this paper, in order to investigate the effects of marco and microscopic observations of fatigue crack growth in friction stir welded (FSWed) 7075-T651 aluminum alloy plates, fatigue crack growth tests were performed under constant amplitude loading condition at room temperature with three different pre-cack locations, namely base metal (BM-CL) and two kinds of pre-crack locations in welded joints, weld metal (WM-CL) and heat affected zone (HAZ-CL) specimens. The fatigue crack growth behavior of FSWed 7075-T651 aluminum alloy plates were discussed based on the marco and microscopic fractographic observations. The marcoscopic aspects of surface crack growth path for BM-CL and HAZ-CL specimens indicate relatively straight lines, however, the crack growth paths of WM-CL specimens grow first straight and by followed toward the TMAZ and HAZ. The microscopic aspects of fatigue fracture for BM-CL and HAZ-CL specimens indicate typical fatigue striation, but WM-CL showed intergranular fracture pattern by micro structural changes of FSW process.
Keywords
Friction Stir Welding; 7075-T651 Aluminum Alloy; Fatigue Crack Growth; Striation;
Citations & Related Records
Times Cited By KSCI : 4  (Citation Analysis)
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