Impact of Specimen Dimensions on Miniature Tensile Characterization of Powder Bed Fabricated 304L Stainless Steel
Miniature tensile specimens with varying aspect ratios were fabricated from 304L stainless steel (SS) made using powder bed additive manufacturing (AM) process. The tensile characteristics measured from these specimens were analyzed to assess the impact of gage length. The study found no impact upon varying gage length on yield and ultimate strength measurements. However, a significant impact was observed on strain measurements. This data was also used to perform Weibull statistics to estimate the stochastic performance of the material. Fractography was performed to visually identify the types of flaws. A comparative study with specimens fabricated from cold rolled annealed 304 SS was also performed. The Weibull parameters were used to compare the variability within cold rolled annealed and AM 304L SS. This study indicates miniature tensile testing is a robust characterization technique for obtaining representative material properties.
S. Karnati et al., "Influence of Gage Length on Miniature Tensile Characterization of Powder Bed Fabricated 304L Stainless Steel," Proceedings of the 28th Annual International Solid Freeform Fabrication Symposium (2017, Austin, TX), pp. 289 - 306, University of Texas at Austin, Aug 2017.
28th Annual International Solid Freeform Fabrication Symposium -- An Additive Manufacturing Conference, SFF 2017 (2017: Aug. 7-9, Austin, TX)
Mechanical and Aerospace Engineering
Materials Science and Engineering
Intelligent Systems Center
Article - Conference proceedings
09 Aug 2017