COMPARISON OF HIGH STRAIN RATE PROPERTIES OF ADDITIVELY MANUFACTURED AND WROUGHT INCONEL 625 VIA KOLSKY BAR TESTING
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Additive manufacturing is becoming an important part of modern manufacturing technology. Before additively manufactured parts gain widespread adoption, the material properties of the additively manufactured material itself must be accurately quantified. Stress strain curves must be produced over a wide variety of test conditions so that accurate modeling of material behavior can be done. Materials that may undergo dynamic loading must therefore be tested under dynamic conditions. In this study the tensile and high strain rate compressive material properties of additively manufactured Inconel 625 are compared to conventionally formed wrought material. The results of testing showed that there is a clear difference in material properties between wrought and additively manufactured Inconel 625 in tension and compression. The additively manufactured tensile samples showed anisotropy between print directions of approximately ±10%. The printed samples had a 35% higher yield strength, a similar ultimate strength, and 20-40% the elongation when compared to wrought. There was also a significant difference in properties between the additive and wrought materials during the compressive tests. The additive material showed little anisotropy and had a 30% higher yield stress than wrought. Additionally, the additive material had a higher strain hardening rate than the wrought samples. No significant strain rate effects were noted.