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:
To restrain global warming, weight reduction of autobodies is needed for fuel saving anddischarge of carbon dioxide (CO2) gas. Usage of light weight aluminum alloy sheets is efficiency forthe weight reduction, but the less formabilities comparing with low carbon steel sheets restrict theusage of autobodies applications actually. To improve the formabilities of aluminum alloy sheets,asymmetric warm rolling is studied.The formability of a metallic sheet strongly depends on the textures. Lankford value (r-value), one ofthe indicators of formability, of recrystallized low carbon steel sheets is high because the density of{111}//ND orientation suitable for deep drawing is high. The texture of conventionally cold rolledand recrystallized aluminum alloy sheets mainly consists of cube texture which is lower r-value andunsuitable for deep drawing. It is well known that similar texture to low carbon steel sheet can beobtained by shear deformation in aluminum alloy sheets. To provide the shear texture in aluminumalloy sheet, asymmetric warm rolling is carried out at 473K-573K with differential roll velocities. Asmall amount of {111}//ND orientation which is hardly produced by conventionally cold rolling isobserved in asymmetric warm rolled aluminum alloy sheets after recrystallizing. Controlling theasymmetric warm rolling conditions, such as rolling temperature, total reduction and asymmetric ratio,higher r-value and deep drawability comparing with conventionally processed aluminum alloy sheetsare achieved. Other properties such as strength, elongation, and bendability of asymmetric warmrolled sheets are almost same as those of conventionally processed sheets
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/14/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.539-543.333.pdf
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