TY - JOUR
T1 - Crystallization behavior and machining properties of annealed Fe–Si–B–Cr amorphous alloys
AU - Kuji, Chieko
AU - Takenaka, Kana
AU - Mizutani, Masayoshi
AU - Shimada, Keita
AU - Kuriyagawa, Tsunemoto
AU - Konno, Toyohiko J.
N1 - Funding Information:
We would like to express our gratitude to the Materials Processing Technology Department of the Iwate Prefectural Industrial Technology Center for the use of the SEM, Vickers hardness tester, and confocal laser microscope; Dr. Y. Kodama and Mr. Y. Hayasaka in the Institute for Metals Research, Tohoku University, respectively, for the preparation of TEM samples and the help in TEM observation; and the Second Fabrication Technology Group of the Engineering Department of Tohoku University for providing the scratching test jig. The part of this work was supported by the Nanotechnology Platform Project (Tohoku University Microstructure Analysis Platform) of the Ministry of Education, Culture, Sports, Science and Technology of Japan (JPMX09A20TU0017) and the Iwate Industrial Technology Center (Iwate Prefecture).
Funding Information:
We would like to express our gratitude to the Materials Processing Technology Department of the Iwate Prefectural Industrial Technology Center for the use of the SEM, Vickers hardness tester, and confocal laser microscope; Dr. Y. Kodama and Mr. Y. Hayasaka in the Institute for Metals Research, Tohoku University, respectively, for the preparation of TEM samples and the help in TEM observation; and the Second Fabrication Technology Group of the Engineering Department of Tohoku University for providing the scratching test jig. The part of this work was supported by the Nanotechnology Platform Project (Tohoku University Microstructure Analysis Platform) of the Ministry of Education, Culture, Sports, Science and Technology of Japan (JPMX09A20TU0017) and the Iwate Industrial Technology Center (Iwate Prefecture).
Publisher Copyright:
© 2021, The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature.
PY - 2021/10
Y1 - 2021/10
N2 - We have systematically prepared diverse microstructures by annealing B-rich Fe–Si–B–Cr amorphous sheets to obtain the optimum mechanical property and cutting machinability of the alloy. Thermal, structural, and mechanical analyses showed that the early reaction sequence of the amorphous alloy upon annealing is characterized by structural relaxation, heterogeneous nucleation of the α-Fe(Si) phase at the surface, and homogeneous nucleation of metastable Fe3B core, which is enclosed by the α-Fe shell. The development of the core–shell structure, approximately 200 nm, is governed by the repeated partitioning out of Si and B from the Fe3B and α-Fe phases, respectively. The hardness and specific cutting resistance force (SCRF) were found maximum for the alloy annealed to 873 K, which is filled with the aforementioned core–shell crystalline phases. On the other hand, the best cutting performance with minimum burrs and chips, and the lowest SCRF, was realized for the alloy annealed at 763 K, which exhibits a heterogeneous microstructure, where the core–shell units are finely dispersed in the amorphous matrix. Graphical abstract: [Figure not available: see fulltext.]
AB - We have systematically prepared diverse microstructures by annealing B-rich Fe–Si–B–Cr amorphous sheets to obtain the optimum mechanical property and cutting machinability of the alloy. Thermal, structural, and mechanical analyses showed that the early reaction sequence of the amorphous alloy upon annealing is characterized by structural relaxation, heterogeneous nucleation of the α-Fe(Si) phase at the surface, and homogeneous nucleation of metastable Fe3B core, which is enclosed by the α-Fe shell. The development of the core–shell structure, approximately 200 nm, is governed by the repeated partitioning out of Si and B from the Fe3B and α-Fe phases, respectively. The hardness and specific cutting resistance force (SCRF) were found maximum for the alloy annealed to 873 K, which is filled with the aforementioned core–shell crystalline phases. On the other hand, the best cutting performance with minimum burrs and chips, and the lowest SCRF, was realized for the alloy annealed at 763 K, which exhibits a heterogeneous microstructure, where the core–shell units are finely dispersed in the amorphous matrix. Graphical abstract: [Figure not available: see fulltext.]
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U2 - 10.1007/s10853-021-06346-7
DO - 10.1007/s10853-021-06346-7
M3 - Article
AN - SCOPUS:85111502106
VL - 56
SP - 16697
EP - 16711
JO - Journal of Materials Science
JF - Journal of Materials Science
SN - 0022-2461
IS - 29
ER -