A series of simple axisymmetric compression tests were carried out on the computer servo controlled Gleeble 1 500 machine when strain rates ranged between 0.05 25 s -1 and deformation temperature 300 500 ℃. The resul...A series of simple axisymmetric compression tests were carried out on the computer servo controlled Gleeble 1 500 machine when strain rates ranged between 0.05 25 s -1 and deformation temperature 300 500 ℃. The results show that flow stress is related to the Zener Hollonom parameter Z and strain, as well as the static recrystallization fraction between passes during multipass hot deformation of 5182 aluminum alloy. Hence, a modified exponential flow stress equation was presented by considering the values of ln A and β as functions of strain, and by using the uniform softening method and incorporating the static recrystallization fraction between passes to consider the effects of residual strain during multipass hot rolling of 5182 aluminum alloy. The validity of the equation was examined by a typical non isothermal multipass deformation test.展开更多
7000系铝合金因具备低密度、高强和高韧等优点而备受关注,工业中可通过多道次热变形来提升合金的综合性能,要获得接近理想状态下的铝合金性能,必须掌握多道次热变形工艺参数对组织演变造成的影响。本实验采用TA DIL 805D动态淬火热膨胀...7000系铝合金因具备低密度、高强和高韧等优点而备受关注,工业中可通过多道次热变形来提升合金的综合性能,要获得接近理想状态下的铝合金性能,必须掌握多道次热变形工艺参数对组织演变造成的影响。本实验采用TA DIL 805D动态淬火热膨胀仪对7050铝合金进行等温热压缩,研究了变形温度、道次间隔时间和首应变对热压缩后的7050铝合金在流变应力、静态和动态软化机制、第二相及织构方面的影响,其中变形温度为360、400℃,应变速率为0.05 s^(-1),间隔时间为10、100 s,首道次应变量分别为0.2、0.4、0.6、0.8和1.0,总应变1.1。结果表明:7050铝合金在双道次热变形过程中发生了动态和静态软化,静态和动态软化机制都是再结晶。提高变形温度会促进再结晶进程,形成较强的P织构,首应变增加,动态软化效果显著,有利于动态再结晶,并且出现cube和R-cube织构,强度随首应变增大而加强。延长道次间隔时间会使织构大量聚集在α-取向线上。另外,合金经过热压缩后存在部分不溶相,但是不溶相的数量与分布与变形条件无关。展开更多
文摘A series of simple axisymmetric compression tests were carried out on the computer servo controlled Gleeble 1 500 machine when strain rates ranged between 0.05 25 s -1 and deformation temperature 300 500 ℃. The results show that flow stress is related to the Zener Hollonom parameter Z and strain, as well as the static recrystallization fraction between passes during multipass hot deformation of 5182 aluminum alloy. Hence, a modified exponential flow stress equation was presented by considering the values of ln A and β as functions of strain, and by using the uniform softening method and incorporating the static recrystallization fraction between passes to consider the effects of residual strain during multipass hot rolling of 5182 aluminum alloy. The validity of the equation was examined by a typical non isothermal multipass deformation test.
文摘7000系铝合金因具备低密度、高强和高韧等优点而备受关注,工业中可通过多道次热变形来提升合金的综合性能,要获得接近理想状态下的铝合金性能,必须掌握多道次热变形工艺参数对组织演变造成的影响。本实验采用TA DIL 805D动态淬火热膨胀仪对7050铝合金进行等温热压缩,研究了变形温度、道次间隔时间和首应变对热压缩后的7050铝合金在流变应力、静态和动态软化机制、第二相及织构方面的影响,其中变形温度为360、400℃,应变速率为0.05 s^(-1),间隔时间为10、100 s,首道次应变量分别为0.2、0.4、0.6、0.8和1.0,总应变1.1。结果表明:7050铝合金在双道次热变形过程中发生了动态和静态软化,静态和动态软化机制都是再结晶。提高变形温度会促进再结晶进程,形成较强的P织构,首应变增加,动态软化效果显著,有利于动态再结晶,并且出现cube和R-cube织构,强度随首应变增大而加强。延长道次间隔时间会使织构大量聚集在α-取向线上。另外,合金经过热压缩后存在部分不溶相,但是不溶相的数量与分布与变形条件无关。
