Assessment of thermo-mechanical fatigue in a nickel-based single-crystal superalloy CMSX-4 accounting for temperature gradient effects

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:809

Article

Sun, Jingyu^1,3  Yang, Shun¹  Yuan, Huang^1,2 

[1] Tsinghua Univ, Sch Aerosp Engn, Beijing, Peoples R China

[2] Tsinghua Univ, Inst Aero Engines, Beijing, Peoples R China

[3] Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech LNM, Beijing, Peoples R China

关键词: Thermal gradient mechanical fatigue (TGMF);    Temperat u r e gradient;    Thermal-mechanical phase angle;    Single crystal superalloy;    Fatigue life model;   

DOI  :  10.1016/j.msea.2021.140918

来源: Elsevier

【 摘 要 】

Turbine blades are working under comple x thermal gradient mechanical loading conditions. In the present study, a nickel-based single-crystal superalloy CMSX-4 is experimentally and computationally investigated under the thermo-mechanical fatigue (TMF) and thermal gradient mechanical fatigue (TGMF) loading conditions of the in-phase and out-of-phase thermal-mechanical angel. The fatigue li f e of TGMF with and without the thermal barrier coating was studied. It was confirmed that the lifetime of TGMF is affected by the temperature gradient significantly and substantially differs from conventional isothermal high temperature fatigue and thermo-mechanical fatigue. Since conventional fatigue models fai l to characterize the TGMF, a modified model con-siders temperature gradient effects and thermal-mechanical phase angle and can describe the TGMF lifetime of the single-crystal superalloy reasonably.

【 授权许可】

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