压力容器2025，Vol.42Issue(12)：1-9,9.DOI:10.3969/j.issn.1001-4837.2025.12.001
热障涂层对IN718合金的高温低周疲劳性能影响研究
Study on the effect of thermal barrier coatings on the high‑temperature low‑cycle fatigue performance of IN718 alloy
摘要
Abstract
The role of thermal barrier coatings(TBCs)in enhancing the high‐temperature oxidation resistance of nickel‐based superalloys has been extensively studied.However,their mechanical behavior under high‐temperature low‐cycle fatigue(LCF)loading,particularly the dual‐effect mechanism evolving with stress levels,remains unclear,which limits the safe design and application of TBCs in key load‐bearing components such as aero‐engine turbine disks.Therefore,LCF tests were conducted on IN718 alloy coated with TBCs at 650℃(a typical assessment temperature for turbine disks).The results show that the influence of the coating on fatigue performance exhibits a significant stress threshold effect:At a stress of 550 MPa,the coating inhibits crack initiation through interfacial bonding and residual compressive stress,improving fatigue life by 43.4%;when the stress exceeds 580 MPa,coating defects become crack sources,reducing fatigue life by up to 70.9%.Fracture analysis indicates that at low stress,the coating can regulate crack propagation and dislocation distribution,improving fatigue performance;at high stress,the coating cracks and propagates along the interface,leading to early failure.Further SEM and TEM microscopic analyses have revealed the interfacial behavior and failure mechanisms of the coating under varying stresses.The research results provide key theoretical basis and data support for the design and reliability evaluation of thermal barrier coatings for fatigue service conditions.关键词
IN718合金/低周疲劳/热障涂层/微观结构/疲劳寿命Key words
IN718 alloy/low‐cycle fatigue/thermal barrier coating/microstructure/fatigue life分类
机械制造引用本文复制引用
毛剑峰,蔡金晨,蔡友权,陈明亚,程东岳,徐遣..热障涂层对IN718合金的高温低周疲劳性能影响研究[J].压力容器,2025,42(12):1-9,9.基金项目
国家自然科学基金资助项目(51975526,51505425) （51975526,51505425）
国家重点研发计划项目(2018YFC0808800) （2018YFC0808800）
