Abstract：The stress rupture life of ZL116 cast aluminum alloy under different stress conditions at 200 ℃ was studied through a series of stress rupture tests. The double logarithmic stress-strain curve of stress rupture life was obtained by isotherm extrapolation model and linear regression operation. The median curve formula, 50% confidence 99.9% survival rate curve formula, and 95% confidence 97.7% survival rate curve formula were obtained. The theoretical calculation data of ZL116 at 200 ℃ were compared with the experimental data. The results showed that the theoretical calculation data matched well with the experimental data, realizing the possibility of predicting the stress rupture life through the given durability strength. This pethood could save design costs and improve the equipment safety.
GUO J T, YUAN C, YANG H C, et al. Creep-rupture behavior of a directionally solidified nickel-base superalloy[J]. Metall Mater Trans A, 2001,31A:1103.
[5]
WANG Y, SHI L, HAN C, et al. Creep rupture mechanisms and life prediction of IN617 for VHTR applications[J]. Materials Science & Engineering, A Structural Materials: Properties, Misrostructure and Processing, 2021(812):812.
LI D, WEI D S. Creep deformation simulation of notched specimens of ZSGH4169 alloy based on θ-projection method[J]. Materials for Mechanical Engineering, 2020, 44(8):63.
[10]
ZHOU B S, TANG X Y, WANG Z D, et al. A finite element model of local damage in creep rupture[J]. Journal of East China University of Science and Technology, 2001(3): 297.
XIAO Q F, HUANG J W, JIANG Y G, et al. Effects of minor Se and Zr additions on mechanical properties and microstructure evolution of Al-Zn-Mg-Cu alloys[J]. Transactions of Nonferrous Metals Society of China, 2020, 30(6): 1429.
[13]
LIU H,XUAN F Z.A new model of creep rupture data extrapolation based on power processes[J].Engineering Failure Analysis,2011,18(8):2324.
2024, Vol. 42 
