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• W3203322755 startingPage "515" @default.
• W3203322755 abstract "The rapid pace of development seen in the metal additive manufacturing (AM) process of laser powder-bed fusion (LPBF) requires in-step advances in processes qualification to enable full-scale adoption. This particularly applies to quantifying how powder feedstock conditions impact end-component quality. This study examines how in-machine 17-4 stainless steel powder feedstocks are affected by prior LPBF processes, and how these effects impact subsequent builds. Examinations of powder morphology, chemistry, flowability, and rheology were conducted to characterize the powder conditions. The resultant effects of powder feedstock condition on produced component quasi-static tensile and high-cycle fatigue properties were analyzed. Fatigue life was analyzed using a reliability modeling approach that enabled a robust statistical comparison of life. Powder characteristics were found to evolve with powder exposure to prior LPBF processes, particularly in the extremes of powder size distribution and measures of bulk flow. No significant effects of these changes on tensile properties were observed. Reliability modeling methods, including the lognormal and Weibull distributions as well as the empirical survival function, are shown to be effective tools for modeling fatigue variability in LPBF manufactured components. Through these tools, fatigue life was found to be invariant with changes in powder condition." @default.
• W3203322755 created "2021-10-11" @default.
• W3203322755 creator A5011738236 @default.
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• W3203322755 date "2021-11-01" @default.
• W3203322755 modified "2023-09-29" @default.
• W3203322755 title "Fatigue of laser powder bed fusion processed 17-4 stainless steel using prior process exposed powder feedstock" @default.
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• W3203322755 doi "https://doi.org/10.1016/j.jmapro.2021.09.045" @default.
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