当前位置: X-MOL 学术Int. J. Fatigue › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Investigation of the Mechanism by which Hot Isostatic Pressing Improves the Fatigue Performance of Powder Bed Fused Ti-6Al-4V
International Journal of Fatigue ( IF 6 ) Pub Date : 2019-03-01 , DOI: 10.1016/j.ijfatigue.2018.10.015
P Li 1 , D H Warner 1 , J W Pegues 2 , M D Roach 3 , N Shamsaei 2 , N Phan 4
Affiliation  

Hot isostatic pressing (HIP) is often needed to obtain powder bed fused (PBF) Ti-6Al-4V parts with good fatigue performance. This manuscript attempts to clarify the mechanisms through which HIP treatment acts to improve high cycle fatigue performance. Several mechanisms are considered and examined against experimental data sets available in the literature. The results suggest that HIP may act most significantly by decreasing the fraction of the defect population that can initiate fatigue cracks, both by decreasing defect sizes below a threshold and by changing the microstructure that surrounds defects. Given the novelty of the latter conclusion, an electron backscatter diffraction microscopy study was performed for validation. The gained understanding provides initial guidance on the choice of optimum HIP soak parameters (Temperature-Pressure-Time) for the high cycle fatigue performance of PBF Ti-6Al-4V.

中文翻译:

热等静压改善粉末床熔融Ti-6Al-4V疲劳性能的机理研究

通常需要热等静压 (HIP) 来获得具有良好疲劳性能的粉末床熔融 (PBF) Ti-6Al-4V 零件。本手稿试图阐明 HIP 处理改善高周疲劳性能的机制。根据文献中可用的实验数据集考虑和检查了几种机制。结果表明,HIP 可以通过减少可引发疲劳裂纹的缺陷群比例来发挥最显着的作用,这既是通过将缺陷尺寸降低到阈值以下,也是通过改变围绕缺陷的微观结构。鉴于后一个结论的新颖性,进行了电子背散射衍射显微镜研究以进行验证。
更新日期:2019-03-01
down
wechat
bug