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切削加工表面完整性,如表面粗糙度、表面残余应力和表面加工硬化,对高温合金零构件的疲劳性能有很大影响。以往主要集中于对高周应力控制疲劳影响的研究,然而,实际应用中许多零构件都需要有关应变控制低周疲劳性能的试验数据。“在航空发动机结构完整性研究”中就提出了加工表面完整性对涡轮盘低周疲劳寿命影响的研究。为此,本文研究了GH33A高温合金在常、高温条件下,不同加工表面质量对其高周和低周疲劳寿命的影响,以便为新型发动机涡轮盘的设计提供依据。
Cutting surface integrity, such as surface roughness, surface residual stress and surface work-hardening, greatly affects the fatigue properties of superalloy components. In the past, most studies focused on the effects of fatigue on high-cycle stress control. However, many components in practice require test data on the low-cycle fatigue performance of strain control. In the study of the structural integrity of aeroengines, a study on the effect of the machined surface integrity on the low-cycle fatigue life of a turbine disk was proposed. In this paper, the effect of different machined surface quality on high and low cycle fatigue life of GH33A superalloy under normal and high temperature conditions was studied in order to provide the basis for the design of a new engine turbine disk.