Assessing the Feasibility of Process Window Estimation for L-PBF Ti-6Al-4V through Hardness Measurements




Poudel, Arun
Yasin, Mohammad Salman
Shao, Shuai
Shamsaei, Nima

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Optimizing the process window for an additively manufactured material using X-ray computed tomography (XCT) is a time-, labor-, and capital-intensive process where a large number of coupons need to be analyzed in the process parameter space. Hence, as a cheaper and faster alternative, this study assessed the relationship between relative density and hardness of laser powder bed fused (L-PBF) Ti-6Al-4V. Coupons with different levels of porosity were fabricated by changing the recommended laser power in the range of ±20% in an interval of 10%. The martensitic microstructure didn’t vary significantly with the change in laser power. On the other hand, Rockwell C hardness (HRC) did. HRC was observed to be in good correlation with the defect content in the coupons. Higher defect content in the coupons resulted in lower HRC and vice versa. Hence, the hardness measurement technique can be used to estimate the process window of L-PBF Ti-6Al-4V.


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