摘要
在实验温度为300℃和400℃,应变速率为0.01s^(-1)和1s^(-1),每道次应变0.4,道次间隔时间为10~900 s条件下,在Gleeble^(-1)500D热力模拟实验机上进行了锻态Al-Zn-Mg-Cu高强铝合金双道次等温压缩实验,研究了合金改锻试样的流变应力软化行为和微观组织演变。结果表明,该合金的双道次热压缩应力软化程度随着温度的升高而降低,随着应变速率的升高而增大,随着道次保温时间延长而升高。400℃时,由于合金在变形过程中的完全回复和再结晶,释放了大部分变形储能,道次间应力软化不明显,且不受应变速率和保温时间的影响;300℃、1 s^(-1)条件下道次间的应力软化程度最为明显,保温10~240 s期间产生的应力软化主要是由再结晶晶粒的长大引起的,240~900 s期间的应力软化主要受析出相的影响。
Isothermal double-pass compression tests of as-forged Al-Zn-Mg-Cu high strength aluminum alloy were carried out on Gleeble-1500D thermal-mechanical simulator at 300℃ and 400℃, strain rates of 0.01 s^-1 and 1 s^-1, strain of 0.4 for each pass and holding time in the range of 10-900 s. Flow stress softening behavior and microstrucmre evolution of the alloy after forging were investigated. The results indicate that the stress softening degree during double-pass compression of the alloy decreases with temperature increasing, and increases with strain rate and holding time increasing. At 400℃, stress softening between passes is not obvious due to complete recovery and recrystallization during deformation and releasing the most of deformation stored energy, and it does not variy with swain rote and holding time. Under the condition of 300 ℃ and 1 s^-1, stress softening degree between passes is the most remarkable. Stress softening during holding period of 0-240 s is caused by the growth of recrystallization grains; and stress softening during holding period of 240-900s is mainly influenced by precipitation phase.
出处
《热加工工艺》
CSCD
北大核心
2015年第23期19-22,共4页
Hot Working Technology
基金
国家自然科学基金项目(51175361)
太原市科技明星项目(120247-12)
