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 most critical stage in the heat treatment of high strength aluminium alloys is therapid cooling necessary to form a supersaturated solid solution. During cold water quenching ofthick sections, the thermal gradients are sufficient to cause inhomogeneous plastic deformationwhich in turn leads to the development of large residual stresses. Two 215 mm thick rectilinearforgings made from 7075 and 7010 were heat treated, and the through thickness residual stressesmeasured by neutron diffraction and deep hole drilling. The distribution of residual stresses wasfound to be similar for both alloys varying from highly triaxial and tensile in the core to a state ofbiaxial compression in the surface. The 7010 forging exhibited significantly larger tensile stressesin the core. 7075 is a much more quench sensitive alloy when compared to 7010. This results in lossof supersaturation by second phase precipitation during quenching in the core of the 7075 forging
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/18/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.571-572.45.pdf
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