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A comparison study of the dwell-fatigue behaviours of additive and conventional IN718: The role of dislocation substructure on the cracking behaviour

机译：添加剂和常规IN718的疲劳疲劳行为的比较研究：位错子结构对裂解行为的作用

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摘要

The dwell-fatigue responses of high temperature materials, such as IN718, manufactured via additive manufacturing processes with different microstructures is of practical interest in terms of time-dependent cracking resistance at elevated temperature. In the present study, the dwell-fatigue cracking behaviours of IN718 manufactured via selective laser melting (SLM) with different heat treatments, and via electron beam melting (EBM) with different scanning strategies were compared at 550 °C and with a long 2160 s dwell-holding period. Comparison has also been made with a conventional forged counterpart. Detailed microstructure characterizations have been done to correlate the role of dislocation substructures on the dwell-fatigue damage mechanisms and cracking resistances. A mechanism regarding the susceptibility of the dislocation cell substructure in SLM materials to creep damage is proposed. In addition, the effects of other microstructure features on the dwell cracking resistance are also discussed.
机译：高温材料的耐疲劳响应，例如IN718，通过具有不同微结构的增材制造方法制造的，对升高温度的时间依赖性裂化抗性具有实际兴趣。在本研究中，通过不同的热处理的选择性激光熔化（SLM）和通过电子束熔化（EBM）在550°C和长2160秒停留期。还使用传统的锻造对应物进行比较。已经进行了详细的微观结构表征以关联位错子结构对耐疲劳损伤机制和开裂抗性的作用。提出了关于SLM材料中脱位细胞骨结构易感性以蠕变损坏的机制。此外，还讨论了其他微观结构特征对停留性裂缝电阻的影响。

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