Comparison of the master sinter curves of water- and gas-atomized AISI 4340 low-alloy steel in binder jetting additive manufacturing

Master sinter curves (MSC) are empirically derived models used to predict bulk densification behavior of a powder-compact exposed to heat in a controlled nitrogen-hydrogen atmosphere. In this study, solid-state sintering MSC models were developed for two types of AISI 4340 powders: water-atomized and gas-atomized, which were deployed in binder jetting additive manufacturing. The models were constructed based on shrinkage measurements obtained...