An orientation-dependent creep life evaluation method for nickel-based single crystal superalloys |
| |
Authors: | Duoqi SHI Tianxiao SUI Zhenlei LI Xiaoguang YANG |
| |
Institution: | School of Energy and Power Engineering, Beihang University, Beijing 100191, China |
| |
Abstract: | This paper aims to propose a creep life evaluation method considering the effect of crystallographic orientation.First,the maximum Schmid factor of{111}<112>and the correspond-ing lattice rotation angle were introduced to form an"orientation factor".Then the equivalent stress was calculated by multiplying this factor and the nominal stress.Latterly,the Larson-Miller Parameter(LMP)method was adopted as the rupture life evaluation criteria,in which the input variable was the equivalent stress instead of the nominal stress.All the predictions showed high accuracy when the proposed method was applied to Mar-M247,SC7-14,CMSX-2,Alloy454,CMSX-4 and DD6.Finally,the applicable temperature ranges of the orientation-dependent method(using equivalent stress)and the traditional LMP method(using nominal stress)were dis-cussed.The results show that only the Orientation-Dependent(OD)method is reliable at interme-diate temperatures(760-850℃)because the orientation has significant effect on the stress rupture life,while the influence of orientation is considerably reduced at high temperatures.Both methods provide precise predictions in this situation,and the LMP method should be favored since it is much easier to implement. |
| |
Keywords: | Creep life Lattice rotation Orientation Schmid factor Single crystal superalloys |
本文献已被 万方数据 ScienceDirect 等数据库收录! |
|