Abstract

Changes in the mechanical properties of selective laser melted maraging steel 300 induced by exposure to a simulated marine environment were investigated. Maraging steel samples were printed in three orientations: vertical (V), 45° (45), and horizontal (H) relative to the print bed. These were tested as-printed or after heat-treatment (490 °C, 600 °C, or 900 °C). One set of specimens were exposed in a salt spray chamber for 500 h and then compared to unexposed samples. Environmental attack induced changes in the microstructural features and composition were analyzed by scanning electron microscopy and energy dispersive spectroscopy respectively. Samples printed in the H and 45° directions exhibited higher tensile strength than those printed in the V direction. Corrosion induced reduction in strength and hardness was more severe in specimens heat-treated between 480 °C and 600 °C versus as-printed samples. The greatest decrease in tensile strength was observed for the 45°-printed heat-treated samples after exposure. A comparison between additive and subtractive manufactured maraging steel is presented.

Highlights

  • Additive manufacturing (AM) is transforming how organizations manufacture and/or acquire products

  • The aim of this paper is to present such a comparison for a maraging steel exposed to a simulated marine environment

  • The powder samples were rich in Ni and Co, but low in Mo as printed and heat‐treated parts were studied using energy-dispersive spectroscopy (EDS)

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Summary

Introduction

Additive manufacturing (AM) is transforming how organizations manufacture and/or acquire products. The various rapid prototyping technologies: fused deposition model, stereolithography, selective laser melting, direct laser metal deposition, etc., are all changing how organizations prototype new parts and how manufacturing of production and replacement parts are completed [1]. Selective laser melting (SLM) is a mature AM technology and is used for the direct fabrication of complex and functional metal components by laser melting a bed of metal powder layer by layer until a fully formed metal part is achieved. Microstructure and mechanical properties of AM metals have been investigated and often compared to subtractive manufactured metals. On how additively manufactured materials will behave in corrosive environments and how their properties compare to materials produced by traditional subtractive technologies. The aim of this paper is to present such a comparison for a maraging steel exposed to a simulated marine environment

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