Abstract
In this paper, 24CrNiMo alloy steel samples under different process parameters were fabricated by selective laser melting technology with an orthogonal experiment in argon atmosphere. The results under the present experimental conditions showed that the formability of 24CrNiMo alloy steel samples was improved significantly as the laser energy density increased in a proper range. The most dense sample was selected for further observation. It was found that the sample was composed of quenched martensite laths, tempered martensite laths and lower bainite with upper bainite ferrite along the building direction. Through further transmission electron microscopy observation, different types of precipitated phases were also found. Electron backscatter diffraction analysis showed that the crystals in the manufacturing process were isotropic with no preferred crystallographic orientation, and the grain size were smaller than 0.5 μm. The distribution of grain boundaries indicated that large proportion of low-grain boundaries occupied the sample, which elevated the grain boundary strengthening effect.
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