| About this Abstract |
| Meeting |
MS&T21: Materials Science & Technology
|
| Symposium
|
Additive Manufacturing of Metals:
ICME Gaps: Material Property and Validation Data to Support Certification
|
| Presentation Title |
Experimental and Numerical Investigation of Pressureless Sintering for Binder Jetted Metal Parts |
| Author(s) |
Kaiwen Zhang, Wei Zhang, Ryan Brune, Xu Zhang, Edward Herderick |
| On-Site Speaker (Planned) |
Kaiwen Zhang |
| Abstract Scope |
In Binder Jetting Additive Manufacturing, liquid binder is deposited to join powder particles to form near-net shape parts at room temperature. The parts are subsequently sintered at high temperatures. A primary challenge for binder jetting is the large, anisotropic shrinkage resulted from sintering. In this study, a macro-scale finite element analysis considering elastic-viscoplastic constitutive behavior is developed to predict the post-sintering shape of binder jetting printed coupons made of stainless steel 316L. The constitutive equation includes both creep and volumetric swelling strain calculations. Experimentally, cantilever- and bridge-shaped coupons were printed using 316L powder and subsequently sintered. The green-state relative density was determined from the mass and volume of as-printed part. The relative density after sintering was determined by the porosity fraction measured on optical micrographs. The effect of input viscoplastic constitutive properties on the calculated quantities such as dimensional shrinkage, final relative density, and deformed shapes was discussed. |