TY - JOUR
T1 - Microstructure and crystallography of borides and mechanical properties of Fe-B-C-Cr-Al alloys
AU - Lv, Zheng
AU - Fu, Hanguang
AU - Xing, Jiandong
AU - Ma, Shengqiang
AU - Hu, Ying
N1 - Publisher Copyright:
© 2015 Elsevier B.V. All rights reserved.
PY - 2016/3/25
Y1 - 2016/3/25
N2 - The solidification microstructure, crystallography of eutectic precipitations and mechanical properties of high boron steel with various aluminium and chromium concentrations have been investigated extensively in the present study, as the foundation of the further analysis about the corrosion and abrasion properties at elevated temperature. The experiment results indicate that the as-cast microstructures of test alloys mainly consist of a dendritic matrix with many interdendritic precipitations. The Fe-B binary alloy is mainly composed of ferrite, Fe2B and pearlite and the Fe-B-Al ternary alloy consists of α-(Fe, Al) solid solution, Fe2B and Fe3AlC0.5. When aluminium and chromium elements are added synchronously, the as-cast microstructure changes to α-(Fe, Al, Cr) solid solution, (Fe, Cr)2B boride, M7(C, B)3 and M23(C, B)6 borocarbides. Moreover, the nucleation and growth of M7(C, B)3 borocarbide is adhere to (Fe, Cr)2B boride because of an interphase match between crystal plane (101(-) 0) of M7(C, B)3 and (010) of Cr-rich (Fe, Cr)2B. Alloy Fe-1.46 wt. % B-0.22 wt. % C-11.92wt. % Cr-8.73 wt. % Al shows the highest impact toughness value. The main fracture mode is brittle fracture of boride and tough fracture of matrix.
AB - The solidification microstructure, crystallography of eutectic precipitations and mechanical properties of high boron steel with various aluminium and chromium concentrations have been investigated extensively in the present study, as the foundation of the further analysis about the corrosion and abrasion properties at elevated temperature. The experiment results indicate that the as-cast microstructures of test alloys mainly consist of a dendritic matrix with many interdendritic precipitations. The Fe-B binary alloy is mainly composed of ferrite, Fe2B and pearlite and the Fe-B-Al ternary alloy consists of α-(Fe, Al) solid solution, Fe2B and Fe3AlC0.5. When aluminium and chromium elements are added synchronously, the as-cast microstructure changes to α-(Fe, Al, Cr) solid solution, (Fe, Cr)2B boride, M7(C, B)3 and M23(C, B)6 borocarbides. Moreover, the nucleation and growth of M7(C, B)3 borocarbide is adhere to (Fe, Cr)2B boride because of an interphase match between crystal plane (101(-) 0) of M7(C, B)3 and (010) of Cr-rich (Fe, Cr)2B. Alloy Fe-1.46 wt. % B-0.22 wt. % C-11.92wt. % Cr-8.73 wt. % Al shows the highest impact toughness value. The main fracture mode is brittle fracture of boride and tough fracture of matrix.
KW - Eutectic boride
KW - Fe-B-C-Cr-Al alloy
KW - Mechanical properties
KW - Solidification structure
UR - https://www.scopus.com/pages/publications/84949844983
U2 - 10.1016/j.jallcom.2015.11.171
DO - 10.1016/j.jallcom.2015.11.171
M3 - 文章
AN - SCOPUS:84949844983
SN - 0925-8388
VL - 662
SP - 54
EP - 62
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
ER -