Tailoring grain sizes of the biodegradable iron-based alloys by pre-additive manufacturing microalloying

Huang C.-C., Lam T.-N., Amalia L., Chen K.-H., Yang K.-Y., Muslih M.R., Singh S.S., Tsai P.-I., Lee Y.-T., Jain J., Lee S.Y., Lai H.-J., Huang W.-C., Chen S.-Y., Huang E.-W.

Department of Materials Science and Engineering, National Yang Ming Chiao Tung University, Hsinchu, 30013, Taiwan; Department of Physics, College of Education, Can Tho University, Can Tho City, 900000, Viet Nam; Teknik Material dan Metalurgi, Institut Teknologi Kalimantan, Balikpapan, 76127, Indonesia; Biomedical Technology and Device Research Laboratories, Industrial Technology Research Institute, Hsinchu, 310, Taiwan; Neutron Scattering Lab. PSTBM-BATAN, Kawasan PUSPIPTEK Serpong15314, Indonesia; Department of Materials Science and Engineering, Indian Institute of Technology Kanpur, Kanpur, UP 208016, India; Department of Materials Science and Engineering, National Taiwan University, Taipei, 10607, Taiwan; Department of Materials Science and Engineering, Indian Institute of Technology, New Delhi, 110016, India; Department of Materials Science and Engineering, Chungnam National University, Daejeon, 34134, South Korea; Material and Chemical Research Laboratories, Industrial Technology Research Institute, Hsinchu, 310, Taiwan; Laser and Additive Manufacturing Technology Center, Industrial Technology Research Institute, Hsinchu, 31040, Taiwan


We demonstrated the design of pre-additive manufacturing microalloying elements in tuning the microstructure of iron (Fe)-based alloys for their tunable mechanical properties. We tailored the microalloying stoichiometry of the feedstock to control the grain sizes of the metallic alloy systems. Two specific microalloying stoichiometries were reported, namely biodegradable iron powder with 99.5% purity (BDFe) and that with 98.5% (BDFe-Mo). Compared with the BDFe, the BDFe-Mo powder was found to have lower coefficient of thermal expansion (CTE) value and better oxidation resistance during consecutive heating and cooling cycles. The selective laser melting (SLM)-built BDFe-Mo exhibited high ultimate tensile strength (UTS) of 1200 MPa and fair elongation of 13.5%, while the SLM-built BDFe alloy revealed a much lower UTS of 495 MPa and a relatively better elongation of 17.5%, indicating the strength enhancement compared with the other biodegradable systems. Such an enhanced mechanical behavior in the BDFe-Mo was assigned to the dominant mechanism of ferrite grain refinement coupled with precipitate strengthening. Our findings suggest the tunability of outstanding strength-ductility combination by tailoring the pre-additive manufacturing microalloying elements with their proper concentrations. © 2021, The Author(s).


Scientific Reports

Publisher: Nature Research

Volume 11, Issue 1, Art No 9610, Page – , Page Count

Journal Link: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85105416997&doi=10.1038%2fs41598-021-89022-9&partnerID=40&md5=0be763356690244fe84b0d4ea5056d84

doi: 10.1038/s41598-021-89022-9

Issn: 20452322

Type: All Open Access, Gold, Green


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