Journal
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
Volume 25, Issue 8, Pages 3390-3397Publisher
SPRINGER
DOI: 10.1007/s11665-016-2169-2
Keywords
additive manufacturing; electron microscopy; interlaboratory study; mechanical behavior; round robin; selective laser melting; superalloys
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Funding
- Intramural NIST DOC [9999-NIST] Funding Source: Medline
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Six different organizations participated in this interlaboratory study to quantify the variability in the tensile properties of Inconel 625 specimens manufactured using laser powder bed fusion-additive manufacturing machines. The tensile specimens were heat treated and tensile tests were conducted until failure. The properties measured were yield strength, ultimate tensile strength, elastic modulus, and elongation. Statistical analysis revealed that between-participant variability for yield strength, ultimate tensile strength, and elastic modulus values were significantly higher (up to four times) than typical within-participant variations. Only between-participant and within-participant variability were both similar for elongation. A scanning electron microscope was used to examine one tensile specimen for fractography. The fracture surface does not have many secondary cracks or other features that would reduce the mechanical properties. In fact, the features largely consist of microvoid coalescence and are entirely consistent with ductile failure.
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