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:
The effect of friction stir welding (FSW) and post weld heat treatment (PWHT)on the second phase particle distribution and cross weld hardness profile in AA7449 plate hasbeen investigated. The alloy was received in an underaged condition, welded, then PWHT togive an overaged condition (in the parent material) . The effect of this complex treatment onthe precipitate distribution in the weld and parent plate has been investigated over a rangeof length scales using small angle X-ray scattering (SAXS), TEM and FEGSEM. It is shownthat the PWHT does not improve the hardness in the heat affected zone (HAZ), which is thelocation of the strength minimum after welding, but it does reduce the difference between thehardness in the HAZ and the nugget and parent hardness. The reduction in nugget strengthafter PWHT is particularly marked and is due to replacement of fine GP zones formed on postweld natural ageing by coarse overaged precipitates
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/13/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.519-521.1181.pdf
