Extreme variation in fatigue: Fatigue life prediction and dependence on build volume location in laser powder bed fusion of 17-4 stainless steel
Extreme variation in fatigue: Fatigue life prediction and dependence on build volume location in laser powder bed fusion of 17-4 stainless steel
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DOI：
10.1016/j.ijfatigue.2022.106737
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发表时间：
2022-01-19
影响因子：
6
通讯作者：
Saldana, Christopher
中科院分区：
文献类型：
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作者：
Berez, Jaime;Sheridan, Luke;Saldana, Christopher
激光粉末床熔融 (LPBF) 是一种金属增材制造技术，非常适合设计优化，但疲劳寿命受到制造缺陷的限制。在这项工作中，在密集的构建体积中制造了 17-4 不锈钢组件，模拟了大规模 LPBF 生产。通过严格的统计工具进行分析，测试揭示了疲劳寿命数据的极大变化。 El-Haddad 模型针对有限寿命进行了修改，可实现基于缺陷的寿命预测。构建体积内的样本位置与寿命相关，这是异方差的。研究构建体积上的缺陷浓度可以解释典型的寿命和分散性。这些发现支持认可材料批次变异性较高的鉴定方法。
Laser powder bed fusion (LPBF), a metal additive manufacturing technology, is well-suited for design optimization but fatigue life is limited by manufacturing defects. In this work, 17-4 stainless steel components were manufactured in densely populated build volumes, simulating at-scale LPBF production. Tests revealed extreme variability in fatigue life data, analyzed via rigorous statistical tools. The El-Haddad model, modified for finite life, enabled defect-based life prediction. Specimen location within the build volume correlated to life, which was heteroscedastic. Investigating defect concentration over the build volume explained typical life and scatter. These findings argue for qualification approaches which acknowledge high material lot variability.