On the Short-Term Creep Response at 482 °C (900 °F) of the 17-4PH Steel Produced by Bound Metal Deposition

Valerio Di Pompeo,Stefano Spigarelli,Eleonora Santecchia,Alberto Santoni

doi:10.3390/met12030477

Abstract

The creep response of the 17-4PH precipitation hardening steel produced by a new additive manufacturing technology (Bound Metal Deposition) was investigated at 482 °C (900 °F), under stresses ranging from 350 to 600 MPa. Two different sets of samples produced with different deposition parameters were considered. Prior heat treatment consisted of ageing either at 482 °C (state H900) or at 621 °C (H1150). The minimum creep rate and time to rupture dependencies on applied stress were obtained. The creep response in terms of time to rupture under a given stress, in particular, was compared with the only other available literature dataset on a similar steel processed by traditional technologies. The analysis of the experiments demonstrated that the presence of dispersed defects causes, in the Bound Metal Deposited steel, a substantial reduction (35–40%) of the creep strength.

Highlights

Metal Additive Manufacturing (AM), a family of technologies in which parts are built layer-by-layer [1], is extremely attractive for a number of biomedical, automotive, aerospace, and oil and gas applications [2,3]
One of the strengths of this approach is that the metal powder is obtained using the same procedure used for Metal Injection Molding (MIM) feedstock, a low-cost process, while the final rod is fabricated by extrusion [6]
Bound Metal Deposition (BMD) creep samples were fabricated by a Desktop MetalTM (DM) Studio System equipment

Summary

Introduction

Metal Additive Manufacturing (AM), a family of technologies in which parts are built layer-by-layer [1], is extremely attractive for a number of biomedical, automotive, aerospace, and oil and gas applications [2,3]. Binder jetting, direct energy deposition, and material extrusion [5] are just a few examples of these processes. Another of the most interesting and recent technologies is Bound Metal Deposition (BMD), developed and patented by the Desktop Metal Company [6]. This process is quite similar to plastic fused filament fabrication (FFF), where material is deposited layer-by-layer using a temperature-controlled extruder [7]. One of the strengths of this approach is that the metal powder is obtained using the same procedure used for Metal Injection Molding (MIM) feedstock, a low-cost process, while the final rod is fabricated by extrusion [6]

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