About this Abstract |
Meeting |
MS&T22: Materials Science & Technology
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Symposium
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Additive Manufacturing of Metals: Microstructure, Properties and Alloy Development
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Presentation Title |
Binder Jetting of Ultra-fine 316L Austenitic Stainless Steel Powder: Microstructure Observation and Mechanical Properties |
Author(s) |
Mohammad Jamalkhani, Mohammadreza Asherloo, Amir Mostafaei |
On-Site Speaker (Planned) |
Mohammad Jamalkhani |
Abstract Scope |
Ultra-fine austenitic 316L stainless steel (SS) powder was binder jetted using an advanced compaction technology equipped with an ultrasonic dispenser and double roller to enhance powder packing density. Densification was studied by vacuum sintering under subsolidus and supersolidus temperatures. It was demonstrated that supersolidus sintering facilitated densification and a final relative density of 99.4% was achieved at 1400 °C for 2 h. Microstructure analysis displayed formation of equiaxed austenitic grain with a mean size of ~33 μm in which delta-ferrite and sigma phases formed at the grain boundaries. Anisotropy shrinkage was seen with a maximum linear shrinkage of 18.4%, 17.7%, 21.5% in X-, Y-, Z-directions. Mechanical testing results showed a yield strength of 202 MPa, tensile strength of 574 MPa, elongation of 90%, and microhardness of 132 HV0.5. Fractography revealed a ductile fracture containing deep dimples in sintered parts with densities of > 99%. |