Microstructure–Hardness–Corrosion Performance of 17–4 Precipitation Hardening Stainless Steels Processed by Selective Laser Melting in Comparison with Commercial Alloy

C. Garcia‑Cabezon; M. A. Castro‑Sastre; A. I. Fernandez‑Abia; M. L. Rodriguez‑Mendez; F. Martin‑Pedrosa

doi:10.1007/s12540-021-01155-8

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자료유형: 학술저널

저자정보: C. Garcia‑Cabezon (Universidad de Valladolid) M. A. Castro‑Sastre (University of León) A. I. Fernandez‑Abia (University of León) M. L. Rodriguez‑Mendez (Universidad de Valladolid) F. Martin‑Pedrosa (Universidad de Valladolid)

저널정보: 대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.28 No.11

발행연도: 2022.11

수록면: 2,652 - 2,667 (16page)

DOI: 10.1007/s12540-021-01155-8

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The 17–4 Precipitation Hardening Stainless Steel (PH SS) manufactured by Selective Laser Melting (SLM) has wide applicationperspectives, but they are limited due to defects and anisotropy. The selection of the appropriate process variablesplays a fundamental part in the microstructure and in the determination of the final mechanical and corrosion properties.The main purpose of this study is to analyze the corrosion behavior, hardness and microstructure of 17–4 PH SS manufacturedby SLM in comparison to the commercial counterparts. The anisotropic behavior was investigated by analyzing themicrostructure–hardness and corrosion interrelationship, both in the surface of the construction platform and in the growthdirection of the element. The corrosion behavior of the SLM 17–4PH SS in its natural state was investigated in relation tothat of the 17–4 PH SS heat treated in a 0.1 M NaCl + 0.5 M H2SO4solution, using three electrochemical techniques. Theresults confirmed that the corrosion resistance of SLM 17–4 PH SS was considerably better than that of the forging, evenafter 60 days of immersion in the test solution. This was attributed to the absence of important manufacturing defects, tothe fine microstructure with an important amount of austenite produced by SLM, and to a small amount of non-metallicinclusions precipitated as a result of the fast cooling and the high speed of solidification associated with the SLM process.

#Additive manufacturing · 17–4 PH SS · SLM · Microstructure · Corrosion

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