Microstructural characterization and properties of selective laser melted maraging steel with different build directions
By Chao-lin Tan, K. Zhou, M. Kuang, Wenyou Ma, T. Kuang. Science and Technology of Advanced Materials, 2018
233 citations recorded by the source corpus.
ABSTRACT A nearly fully dense grade 300 maraging steel was fabricated by selective laser melting (SLM) additive manufacturing with optimum laser parameters. Different heat treatments were elaborately applied based on the detected phase transformation temperatures. Microstructures, precipitation characteristics, residual stress and properties of the as-fabricated and heat-treated SLM parts were systematically characterized and analyzed. The observed submicron grain size (0.31 μm on average) suggests an extremely high cooling rate up to 107 K/s. Massive needle-shaped nanoprecipitates Ni3X (X = Ti, Al, Mo) are clearly present in the martensitic matrix, which accounts for the age hardening. The interfacial relations between the precipitate and matrix are revealed by electron microscopy and illustrated in detail. Strengthening mechanism is explained by Orowan bowing mechanism and coherency strain hardening. Building orientation-based mechanical anisotropy, caused by ‘layer-wise effect’, is also investigated in as-fabricated and heat-treated specimens. The findings reveal that heat treatments not only induce strengthening, but also significantly relieve the residual stress and slightly eliminate the mechanical anisotropy. In addition, comprehensive performance in terms of Charpy impact test, tribological performance, as well as corrosion resistance of the as-fabricated and heat-treated parts are characterized and systematically investigated in comparison with traditionally produced maraging steels as guidance for industry applications. Graphical Abstract
Subfields: Automotive Engineering, Mechanical Engineering
View Paper: https://www.semanticscholar.org/paper/9aef71417ff8cc0f124c7bc4b1043cdb6ed7bd47
How researchers see this paper
The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.
In Automotive Engineering
In Mechanical Engineering
Citations in the corpus
- Additive manufacturing of steels: a review of achievements and challenges (2020, methodology): “With the appropriate selection of process parameters and building strategy [164, 165], it is feasible to produce 18Ni 300 maraging steel samples with YS and UTS comparable and even superior to those of the ASM standard wrought properties (shown in Table 2) in both the solution treated and aged condi”
- Steels in additive manufacturing: A review of their microstructure and properties (2020, background): “found the mechanical properties to be isotropic [114].”