Abstract
Binder jetting additive manufacturing of 420 martensitic stainless steel is attractive due to its low-cost and high efficiency, however, the as-sintered parts do not typically provide the desired properties. Here, a heat treatment route was designed to improve its mechanical properties. The heat treatment increased the ultimate tensile strength (UTS) from 657 MPa to 1032 MPa compared to the as-sintered state, while the elongation to fracture decreased from 6.9% to 5%. The increase in martensite fraction as a result of martensitic transformation is responsible for the enhanced UTS of the heat-treated sample.
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