A review on the science of plastic deformation in laser-based additively manufactured steel

摘要

Additive manufacturing (AM) is believed to be a breakthrough technology that may potentially revolutionize various industries, including aerospace, biomedical, and automotive industries. The metallic materials processed by AM, especially by laser-based AM, generally demonstrate different mechanical behaviors as compared to their wrought/cast counterparts. Among all the metallic materials, steel has been the most widely used one with an enormous amount of production. Steel can be processed to have varied phases (martensite, ferrite, bainite, austenite, etc.) with different mechanical behaviors. Depending on the stacking fault energy (SFE), the plasticity of steel can be achieved through the slip of dislocations, the formation of martensite, or the generation of deformation twins. In this review, we focus on the plasticity of steel made by laser-based AM and pay less attention to the effect of processing parameters on other properties (e.g., density, surface roughness and solidification cracks). This review helps to deepen the understanding of the deformation behaviors of laser-based AM fabricated steel, which can be potentially applied in different industrial fields.