ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Friction stir welding (FSW) allows the joining of aluminum alloys in ways previouslyunattainable offering new manufacturing technology. Friction stir processing (FSP) of castalloys such as Ni-Al bronze eliminates casting voids and improves the properties to that ofwrought material. However, the local heating produced by both FSW and FSP can leave afusion zone with reduced mechanical properties and a heat-affected zone with tensile residualstresses that can be deleterious to fatigue performance. Controlled plasticity burnishing (CPB) isan established surface treatment technology that has been investigated and described extensivelyfor the improvement of damage tolerance, corrosion fatigue, and stress corrosion crackingperformance in a variety of alloys. Mechanical CPB processing in conventional CNC machinetools or with robotic tool positioning is readily adapted to industrial FSW and FSP fabrication ofcomponents, either simultaneously or as a post process.CPB was applied to FSP Ni-Al Bronze to produce a depth of compression of 2.5 mm and amaximum subsurface magnitude of –150 ksi. The effect of FSP on the fatigue performance in asaltwater marine environment and in the presence of foreign object damage (FOD) wasdocumented with and without CPB processing. FSP was found to increase the fatigue strengthof the Ni-Al Bronze by 70% without affecting the corrosion behavior of neutral salt solution.FSW actually produced a more noble material in the acidic salt solution. CPB after FSPmitigated damage 1 mm deep
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/15/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.539-543.3807.pdf
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