Revealing the influential mechanism of strain ranges on cyclic-life saturation during creep-fatigue in Nickel-based superalloy DZ445
Revealing the influential mechanism of strain ranges on cyclic-life saturation during creep-fatigue in Nickel-based superalloy DZ445
复制标题
揭示镍基高温合金DZ445蠕变疲劳过程中应变范围对循环寿命饱和度的影响机制
DOI：
10.1016/j.ijplas.2022.103320
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发表时间：
2022-08
影响因子：
9.8
通讯作者：
Peter K. Liaw
中科院分区：
文献类型：
--
作者：
Biao Ding;Weili Ren;Yunbo Zhong;Xiaotan Yuan;Tianxiang Zheng;Zhe Shen;Yifeng Guo;Qiang Li;Chunmei Liu;Jianchao Peng;Josip Brnic;Yanfei Gao;Peter K. Liaw
蠕变-疲劳交互作用已被认为是大多数在高温区工作的结构部件的主要失效模式。循环寿命（Nf）通常随着它们相互作用的停留时间而连续减小。然而，在本研究的镍基高温合金DZ 445中，Nf显示出异常变化，即保持不变或略有增加/减少。这意味着广义的“Nf饱和”是通过分别对应于局部和均匀损伤的直单超位错和位错网络之间的动态平衡来实现的。随着高应变范围的增加，饱和现象更容易出现。随着保压时间的增加，力学响应参数、损伤特征和相位对合的变化在高应变范围内表现出较低的幅度。综合分析表明，在大变形范围内，通过增加局部损伤，容易出现Nf饱和。上述机制很好地证实了在大变形范围内，直超位错随驻留时间的变化率很低。循环寿命“饱和现象”的不同判据模型中的参数将力学响应和损伤机理很好地统一起来。该工作为高温金属材料的蠕变疲劳安全性设计和位错模型的建立提供了新的理论依据和指导。
The creep-fatigue interaction has been recognized as the main failure mode of most structural components operating in the high-temperature regime. The cyclic life (Nf) usually decreases continuously with the dwell time in their interactions. However, Nfshows an abnormal change, i.e. keeps constant or slightly increases/decreases, in the present studied Nickel-based superalloy, DZ445. This means that generalized “Nfsaturation” is achieved by a dynamic equilibrium between the straight single superdislocations and dislocation networks corresponding to local and homogeneous damage, respectively. The saturation appears more easily with the increasing high strain ranges. The variation in the mechanical response parameters, the damage characterizations, and the phase involutions with the increasing dwell time exhibits the low amplitude under the high strain range. The combined characteristics show that the easy occurrence of Nfsaturation in the range of large deformations is obtained by increasing the local-damage. The low change rate of straight single superdislocations with the dwell time in the range of large deformation is well confirmed by the above mechanism. The parameters in the different criterion models of the cyclic-life “saturation phenomenon” unify the mechanical response and the damage mechanism soundly. The work provides a new theoretical basis and guidance for the creep-fatigue safety design of high-temperature metallic materials and the establishment of dislocation-based models.
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影响因子：
9.8
作者：
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通讯作者：
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影响因子：
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DOI：
10.1016/j.msea.2015.07.058
发表时间：
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影响因子：
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通讯作者：
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影响因子：
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作者：
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通讯作者：
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