Microstructure, texture, and anisotropic mechanical behavior of selective laser melted maraging stainless steels

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Sanjari, Mehdi and Mahmoudiniya, Mahdi and Pirgazi, Hadi and Tamimi, Saeed and Ghoncheh, Mohammad Hossein and Shahriairi, Ayda and Hadadzadeh, Amir and Amirkhiz, Babak Shalchi and Purdy, Mackenzie and de Araujo, Edgar Gomes and Kestens, Leo and Mohammadi, Mohsen (2022) Microstructure, texture, and anisotropic mechanical behavior of selective laser melted maraging stainless steels. Materials Characterization, 192. 112185. ISSN 1044-5803 (https://doi.org/10.1016/j.matchar.2022.112185)

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Abstract

In present research, the effect of building orientation on microstructure, texture and mechanical properties of a low carbon maraging steel processed by selective laser melting (SLM) technique is studied. The microstructural characterization and grain structure observations of the fabricated samples are conducted using electron microscopies and electron backscatter diffraction. It is observed that by altering the building orientation from vertical to horizontal, the morphology of the grains changes from columnar-dendritic to equiaxed. In addition, a higher volume fraction of austenite is retained in the horizontal sample compared with the vertically printed sample due to a faster cooling rate, higher degree of micro-segregation, and smaller prior austenite grains. Consequently, a higher strength and better ductility are achieved in the horizontally printed sample. The Taylor factorshows that different obtained tensile properties are not related to the crystallographic texture but are affected by grain size, retained austenite, and stress concentration conditions.

ORCID iDs

Sanjari, Mehdi, Mahmoudiniya, Mahdi, Pirgazi, Hadi, Tamimi, Saeed ORCID logoORCID: https://orcid.org/0000-0002-5450-0073, Ghoncheh, Mohammad Hossein, Shahriairi, Ayda, Hadadzadeh, Amir, Amirkhiz, Babak Shalchi, Purdy, Mackenzie, de Araujo, Edgar Gomes, Kestens, Leo and Mohammadi, Mohsen;
CORE (COnnecting REpositories)