TY - JOUR
T1 - Achieving excellent strength-ductility combination through the control of intricate substructures in an additively manufactured Co–Cr–Mo alloy
AU - Jiang, Wenting
AU - An, Xinglong
AU - Ni, Song
AU - Wang, Li
AU - He, Junyang
AU - Chen, Zibin
AU - Huang, Yi
AU - Song, Min
N1 - Funding information:
We would like to thank the financial support from National Natural Science Foundation of China [grant number 52171130 (S.N.) , 52101207 (J.H.) ], Huxiang Youth Talents Support Program [grant number 2021RC3002 (S.N.)], the Science and Technology Innovation Program of Hunan Province [grant number 2022RC3035 (M.S.)] and Postgraduate Research Innovation Project of Central South University ( 2022ZZTS0399 ). ZBC would like to express his sincere thanks to the financial support from the Research Office and Research Institute of Advanced Manufacturing of the Hong Kong Polytechnic University [grant numbers P0039966 and P0041361 ]. YH is grateful for support from the Royal Society in the UK under Grant No. IEC\R3\193025 . The Advanced Research Center of Central South University is sincerely appreciated for TEM and APT technical support.
Publisher Copyright:
© 2023 Elsevier B.V.
PY - 2023/10/17
Y1 - 2023/10/17
N2 - In this study, we successfully endowed a classical Co25Cr5Mo5W alloy with excellent strength-ductility combination by regulating the substructures during laser powder bed fusion (LPBF) and subsequent heat treatment. State-of-the-art characterizations reveal that the as-built Co25Cr5Mo5W alloy features integrated networks of dense cell boundaries and stacking faults within a near-pure face-centered cubic matrix, which jointly confer a high yield strength of ∼820 MPa and a high ductility of ∼22.3%. Upon heat treatment, the heavy decoration of solutes Cr, Mo, W, and Si at cell boundaries triggers heterogeneous nucleation and growth of Laves precipitates within 15 min. After that, global intercellular precipitation occurs, further boosting the yield strength to ∼1170 MPa at a decent ductility of ∼7.5% when heat-treated for 60 min. Such a finding establishes a clear connection between the substructures and the mechanical properties, offering valuable implications for surpassing the current mechanical limitation in the Co–Cr–Mo alloy family.
AB - In this study, we successfully endowed a classical Co25Cr5Mo5W alloy with excellent strength-ductility combination by regulating the substructures during laser powder bed fusion (LPBF) and subsequent heat treatment. State-of-the-art characterizations reveal that the as-built Co25Cr5Mo5W alloy features integrated networks of dense cell boundaries and stacking faults within a near-pure face-centered cubic matrix, which jointly confer a high yield strength of ∼820 MPa and a high ductility of ∼22.3%. Upon heat treatment, the heavy decoration of solutes Cr, Mo, W, and Si at cell boundaries triggers heterogeneous nucleation and growth of Laves precipitates within 15 min. After that, global intercellular precipitation occurs, further boosting the yield strength to ∼1170 MPa at a decent ductility of ∼7.5% when heat-treated for 60 min. Such a finding establishes a clear connection between the substructures and the mechanical properties, offering valuable implications for surpassing the current mechanical limitation in the Co–Cr–Mo alloy family.
KW - Additive manufacturing
KW - Cobalt-chromium-molybdenum alloy
KW - Mechanical properties
KW - Precipitation behavior
KW - Stacking fault
UR - http://www.scopus.com/inward/record.url?scp=85171357244&partnerID=8YFLogxK
U2 - 10.1016/j.msea.2023.145687
DO - 10.1016/j.msea.2023.145687
M3 - Journal article
AN - SCOPUS:85171357244
SN - 0921-5093
VL - 886
JO - Materials Science and Engineering: A
JF - Materials Science and Engineering: A
M1 - 145687
ER -