终轧温度及退火温度对5052铝合金板材组织及性能的影响

Effect of finish rolling temperature and annealing temperature on microstructure and properties of 5052 aluminum alloy sheet

采用拉伸和硬度测试、显微组织及拉伸断口观察等方法研究了终轧温度及退火温度对5052铝合金板材组织及性能的影响。结果表明,未经退火时,板材表层已经发生再结晶,而中心层组织仅发生回复过程。退火处理后,随退火温度的升高,合金板材的强度、硬度下降,而伸长率增加。5052铝合金终轧温度不低于330℃时,可在后续的冷加工获得较为均匀的组织,经400~500℃退火可获得综合性能较为优异(R_(m)≥175 MPa、R_(p0.2)≥65 MPa和A≥32%)的5052-O态合金板材。

Effects of finish rolling temperature and annealing temperature on microstructure and properties of the 5052 aluminum alloy sheet were studied by using tensile and hardness tests,microstructure and tensile fracture observation.The results show that,without annealing after rolling the recrystallization occur on the surface layer of the sheet,while only a recovery process occurs in the center layer structure.After annealing,with the increase of annealing temperature,the strength and hardness of the alloy sheet decrease,but the elongation increases.When the final rolling temperature of the 5052 aluminum alloy is not lower than 330℃,a uniform microstructure can be obtained during the subsequent cold working,and a more excellent comprehensive properties of 5052-O state alloy sheet can be obtained after annealing at 400-500℃,at which the mechanical properties are R_(m)≥175 MPa,R_(p0.2)≥65 MPa and A≥32%.