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Burns, James T.

Jeyamohan, Rajaguru

ma, Ji

Scully, John R.

Shabana, Mohammed

English

Engineering Conferences International

EFFECT OF LASER SURFACE TREATMENT ON THE CORROSION AND FATIGUE PERFORMANCE OFAA5456-H116 ALLOYSRajaguru Jeyamohan, University of Virginia, Charlottesville, VA, USA,bhx9su@virginia.eduMohammed Shabana, University of Virginia, Charlottesville, VA, USAJi ma, University of Virginia, Charlottesville, VA, USAJohn R. Scully, University of Virginia, Charlottesville, VA, USAJames T. Burns, University of Virginia, Charlottesville, VA, USAKey Words: Laser surface treatment and fatigue lifeAA50546-H116 alloys are widely used in marine environments due to their excellent mechanical strength andcorrosion resistance. However, the presence of detrimental beta/(Al3mg2) precipitates along grain boundariesmakes these materials susceptible to intergranular corrosion and corrosion fatigue. In this work, laser surfacetreatment (LST) on the AA5456-H116 alloy is performed with the aim of improving its corrosion resistancewithout significantly compromising its fatigue performance. Microstructural examination by EBSD and SEMindicates that laser irradiation resolutionizes the beta particles and constituent particles effectively in the laser-treated region, leading to enhanced corrosion resistance. The crack initiation location in the fracture surfaceduring fatigue testing was determined using marker band analysis. The laser-treated region showed a faster rateof crack propagation, with the total fatigue life decreasing considerably for LST. Fractography investigationrevealed that laser-induced defects such as pores and cracks played a significant role in the reduction of fatiguecrack initiation life

Effect of laser surface treatment on the corrosion and fatigue performance   of aa5456-h116 alloys

https://dc.engconfintl.org/cgi/viewcontent.cgi?filename=0&article=1003&context=eac6&type=additional

Effect of laser surface treatment on the corrosion and fatigue performance of aa5456-h116 alloys

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Engineering Conferences International