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Shielding effects on fatigue and crack growth of the recasting zone induced by laser manufacturing in a nickel-based superalloy
International Journal of Fatigue ( IF 6 ) Pub Date : 2021-09-13 , DOI: 10.1016/j.ijfatigue.2021.106523
Tinglian Zhang 1 , Huang Yuan 1, 2
Affiliation  

In the present work, the fatigue property and crack growth of the laser recasting material were experimentally and computationally investigated. Based on the mechanical properties identified by instrumented indentation, detailed finite element computations were performed within cyclic plasticity. The shielding effect is attributed to strength mismatch, leading to cyclic softening and mean stress relaxation in the under-matched recasting material. The recasting material shows a higher crack nucleation resistance and a lower crack growth rate than base material due to the shielding effect. The result confirms that the weak recasting zone cannot diminish the overall mechanical performance of structure.



中文翻译:

镍基高温合金激光制造重铸区疲劳和裂纹扩展的屏蔽效应

在目前的工作中,对激光重铸材料的疲劳性能和裂纹扩展进行了实验和计算研究。基于仪器压痕确定的机械性能,在循环塑性内进行了详细的有限元计算。屏蔽效应归因于强度失配,导致不匹配的重铸材料出现循环软化和平均应力松弛。由于屏蔽效应,重铸材料表现出比母材更高的抗裂纹成核能力和更低的裂纹扩展速率。结果证实,弱重铸区不会降低结构的整体力学性能。

更新日期:2021-09-17
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