胀形对2219铝合金环形件淬火残余应力的影响  

Effect of bulging on quenching residual stress of 2219 aluminum alloy ring

作　　者：李俊衡 吴运新 龚海[1,2,3,4] Li Junheng;Wu Yunxin;Gong Hai(Research Institute of Light Alloys,Central South University,Changsha Hunan 410083,China;State Key Laboratory of High-Performance Complex Manufacturing,Central South University,Changsha Hunan 410083,China;Nonferrous Metal Advanced Structural Materials and Manufacturing Collaborative Innovation Center,Central South University,Changsha Hunan 410083,China;School of Mechanical and Electrical Engineering,Central South University,Changsha Hunan 410083,China)

机构地区：[1]中南大学轻合金研究院,湖南长沙410083 [2]中南大学高性能复杂制造国家重点实验室,湖南长沙410083 [3]中南大学有色金属先进结构材料与制造协同创新中心,湖南长沙410083 [4]中南大学机电工程学院,湖南长沙410083

出　　处：《金属热处理》2021年第7期114-120,共7页Heat Treatment of Metals

基　　金：国家自然科学基金航天联合基金项目(U1637601);民用航天预研项目(B0109)。

摘　　要：利用ABAQUS有限元软件对2219铝合金环形件淬火过程及后续胀形过程中径向截面上残余应力的分布进行数值模拟,研究了胀形量对淬火残余应力消减率的影响。结果表明:淬火后环件的径向应力在上下端面呈压应力,在-106 MPa左右,在芯部应力值较小;周向应力和轴向应力均呈外部压应力、芯部拉应力的应力分布状态。胀形对环件的径向应力、周向应力和轴向应力均有显著的消减效果。胀形量在0.25%~4.00%范围内增加时,环形件的残余应力减小,周向应力和轴向应力的消减率都增大并趋于定值,且周向应力消减率的增大速度比轴向应力消减率的增大速度快。当胀形量<3%时,周向应力的消减率大于轴向应力的消减率,当胀形量> 3%时,周向应力的消减率略小于轴向应力的消减率;当胀形量> 2%时,周向应力和轴向应力的平均消减率> 80%,环件的淬火残余应力得到很好的消减。Residual stress distribution of 2219 aluminum alloy ring parts during quenching process and subsequent bulging process was simulated by ABAQUS finite element software,and the influence of bulging amount on reduction of quenching residual stress was studied.The results show that after quenching,the radiat stress of the ring is compressive stress of about-106 MPa on the outside of upper and lower side,while the stress at the core is small.Both the circumferential stress and the axial stress are distributed as compressive stress on the outside and as tensile stress at the core.The bulging has a significant reduction effect on radial stress,circumferential stress and axial stress of the ring.When the bulging amount increases in the range of 0.25%-4.00%,the residual stress of the ring decreases,the reduction rates of both the circumferential stress and the axial stress increase and tend to a fixed value,and the reduction rate of the circumferential stress increases faster than that of the axial stress.When the bulging amount is less than 3%,the reduction rate of circumferential stress is greater than that of axial stress;when the bulging amount is greater than 3%,the reduction rate of circumferential stress is slightly smaller than that of axial stress;when the bulging amount is greater than 2%,the average reduction rate of the circumferential stress and the axial stress is greater than 80%,which indicates that the residual stress of ring after quenching is well reduced.

关 键 词：2219铝合金 淬火 胀形 残余应力场 

分 类 号：TB31[一般工业技术—材料科学与工程]