Journal
MATERIALS & DESIGN
Volume 89, Issue -, Pages 1171-1180Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2015.10.073
Keywords
Electron beam melting deposition; Oxide dispersion strengthened ferritic steel; Grain morphology; Microstructure; Mechanical properties
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Funding
- National Natural Science Foundation of China [11175203, 11375230]
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The solid blocks and walls of the oxide dispersion strengthened (ODS) ferritic steel with nominal composition of Fe-18Cr-2W-0.5Ti-0.3Y(2)O(3) were fabricated by electron beam selective melting (EBSM) method. Processes of melting, grain morphology, tensile properties and fracture behavior of this kind of steel were characterized. It was shown that formation mechanism of columnar grains and equiaxed grains is different during the two scan strategy melting processes. The added nano-scale oxide particles evenly distributed in the molten metal, and the size of these particles did not coarsen during the rapid melting and cooling steps. The ultimate tensile strength of the annealed blocks and walls is superior to the plates with same composition consolidated by powder metallurgy. Especially, wall builds tested parallel to the columnar growth orientation exhibit the outstanding mechanical properties at high temperature owing to the grain anisotropy and uniform distribution of fine Y-rich particles. In addition, the morphology of the individual fracture surfaces demonstrates the grain structure of the cross-section and fracture mode. A certain number of nanoscopic dispersoids are retained in dimples of all the EBSM builds, leading to enhanced strengthening. (C) 2015 Elsevier Ltd. All rights reserved.
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