Rationalization of brittleness and anisotropic mechanical properties of H13 steel fabricated by selective laser melting. (June 2022)

• Record Type: Journal Article
• Authors: Tan, Qiyang; Yin, Yu; Wang, Feng; Chang, Haiwei; Liu, Shiyang; Liang, Guofang; Wu, Tao; Zhang, Ming-Xing
• Is Part Of: Scripta materialia. Number 214(2022)
• Publication Date: 2022-06
• Subjects: Selective laser melting -- Steels -- Martensitic phase transformations -- EBSD -- TEM; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2022.114645
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: This work revealed the causes of embrittlement and anisotropy in the mechanical properties of H13 steel fabricated by selective laser melting (SLM). It was found that the low mechanical stability of the carbon-enriched retained γ (austenite) films amongst martensite blocks transferred to high carbon twin martensite through stress-induced martensitic transformation upon plastic deformation, leading to a high susceptibility to cracking. Moreover, owing to the directional solidification nature in SLM, the majority of these retained γ films was aligned with the building direction (i.e. longitudinal direction). This significantly impaired the ductility of the steel when the load was perpendicular to these γ films (i.e. transverse loading condition). Graphical abstract: Image, graphical abstract