【摘 要】
：
采用两种不同热处理工艺对GH4169合金进行处理,观察并研究了合金的显微组织变化以及在5个应变幅(1.2%、1.0%、0.8%、0.6%和0.5%)和650℃条件下δ相对合金低周疲劳性能的影响
【机 构】
：
华东理工大学机械与动力工程学院承压系统与安全教育部重点实验室,
论文部分内容阅读
采用两种不同热处理工艺对GH4169合金进行处理,观察并研究了合金的显微组织变化以及在5个应变幅(1.2%、1.0%、0.8%、0.6%和0.5%)和650℃条件下δ相对合金低周疲劳性能的影响。结果表明:随着900℃保温时间的延长,合金δ相的析出量增加。合金在高应变幅(Δεt/2≥0.6%)下的疲劳寿命基本不受δ相含量变化的影响;而在较小应变幅下(Δεt/2=0.5%)的疲劳寿命则具有一定的分散性,并随着δ相含量的增加而增加;与此同时,合金的塑性应变-寿命曲线在常温下具有的双线性特征在650℃高温下却不再具有,而且疲劳断口在相同应变幅下呈现出相似的形貌,裂纹源数量也随着应变幅的增加而增加。
The GH4169 alloy was treated by two different heat treatment processes. The microstructure of the alloy was observed and studied. The results showed that the alloy δ (subscript g) at 5 strain amplitude (1.2%, 1.0%, 0.8%, 0.6% and 0.5% Relative low cycle fatigue properties of alloys. The results show that with the increase of holding time at 900 ℃, the precipitation amount of alloy δ phase increases. The fatigue life of the alloy under the condition of high strain amplitude (Δεt / 2≥0.6%) is basically unaffected by the change of δ phase content; while the fatigue life under a small strain amplitude (Δεt / 2 = 0.5%) is decentralized The bilinear characteristics of the plastic strain-life curve of the alloy at room temperature are no longer available at 650 ℃, and the fatigue fracture in the same strain amplitude Showing a similar morphology, the number of crack sources also increases with the increase of strain amplitude.
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