@article{,
    author = {Ikehata, Hideaki; Jägle, Eric A.},
    title = {Evaluation of microstructure and tensile properties of grain-refined, Ti-alloyed ferritic stainless steel fabricated by laser powder bed fusion},
    editor = {},
    booktitle = {},
    series = {},
    journal = {Materials Science and Engineering A},
    address = {},
    publisher = {},
    edition = {},
    year = {2021},
    isbn = {},
    volume = {818},
    number =  {},
    pages = {141365},
    url = {https://doi.org/10.1016/j.msea.2021.141365},
    doi = {10.1016/j.msea.2021.141365},
    keywords = {},
    abstract = {Many alloys produced by Laser Powder Bed Fusion (LPBF) suffer from coarse grains and anisotropic mechanical
properties. Here, we investigate how the addition of Ti can cause significant strengthening via grain refinement
in a model ferritic stainless steel. We perform LPBF experiments using elemental Fe, Cr, and Ti powders (with
significant O impurity in the Fe powder) and perform microstructural analysis by SEM, EDS and EBSD as well as
tensile tests on the alloys Fe-19at.%Cr and Fe-19at.%Cr-5at.%Ti. The Fe-Cr alloy displays very large grains after
LPBF and a strong cube texture, rendering its mechanical properties similar to a single crystal. In the Fe-Cr-Ti
alloy, TiO particle formation in the melt causes strong grain refinement, leading to a texture-free microstructure
consisting of equiaxed grains ~1.6 μm in diameter. The 0.2% proof strength of the ternary alloy is more than
double that of the binary alloy (281 MPa → 591 MPa), and the work hardening rate is also increased. While the
elongation at fracture is reduced for the Fe-Cr-Ti alloy, at ~15 %, it remains sufficient, and samples show ductile
fracture surfaces. We estimate that the grain refinement accounts for the majority of the strengthening, however,
solid solution strengthening and the effect of the texture are also significant.},
    note = {},
    institution = {Universität der Bundeswehr München, Fakultät für Luft- und Raumfahrttechnik, LRT 5 - Institut für Werkstoffkunde, Professur: Jägle, Eric A.},
    
    
}