TY - JOUR
T1 - The influence of post-aging treatment on the microstructure and micromechanical behaviors of additively manufactured maraging steel investigated by in situ high-energy X-ray diffraction
AU - Li, Yang
AU - Yu, Jingyue
AU - Li, Shilei
AU - Wang, Shengjie
AU - Ren, Yang
AU - Yang, Ke
AU - Wang, Yan-Dong
PY - 2024/11/20
Y1 - 2024/11/20
N2 - The microstructure evolution and micromechanical behaviors of additively manufactured 18Ni300 maraging steel for both as-printed and aged one were investigated using the in situ high-energy X-ray diffraction (HE-XRD) technique with uniaxial tensile tests. The investigations revealed that the volume fraction of reversed austenite increased as the annealing temperature rose. The maraging steel was strengthened by η-Ni3Ti precipitates, where the aged maraging steel had a higher UTS value of ∼1860 MPa than ∼1135 MPa in the as-printed one, but sacrificed more than half of ductility (from ∼8.6 % to ∼4.0 %). The austenite in aged steel presents more stability induced by the aging process than that in as-printed counterpart, which has a higher critical martensitic transformation stress of ∼1200 MPa than that of ∼780 MPa in as-printed steel. The austenite grains orientated with [200]//LD yield before the macro-yielding and preferential martensite transformation occurs. This study provides further insight into the intricated micromechanical responses of additively manufactured 18Ni300 maraging steel, enlarging the scope of its adaptation and application. © 2024 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
AB - The microstructure evolution and micromechanical behaviors of additively manufactured 18Ni300 maraging steel for both as-printed and aged one were investigated using the in situ high-energy X-ray diffraction (HE-XRD) technique with uniaxial tensile tests. The investigations revealed that the volume fraction of reversed austenite increased as the annealing temperature rose. The maraging steel was strengthened by η-Ni3Ti precipitates, where the aged maraging steel had a higher UTS value of ∼1860 MPa than ∼1135 MPa in the as-printed one, but sacrificed more than half of ductility (from ∼8.6 % to ∼4.0 %). The austenite in aged steel presents more stability induced by the aging process than that in as-printed counterpart, which has a higher critical martensitic transformation stress of ∼1200 MPa than that of ∼780 MPa in as-printed steel. The austenite grains orientated with [200]//LD yield before the macro-yielding and preferential martensite transformation occurs. This study provides further insight into the intricated micromechanical responses of additively manufactured 18Ni300 maraging steel, enlarging the scope of its adaptation and application. © 2024 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
KW - Additive manufacturing
KW - Aging treatment
KW - High-energy X-ray diffraction
KW - Maraging steel
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UR - https://www.scopus.com/record/pubmetrics.uri?eid=2-s2.0-85191434571&origin=recordpage
U2 - 10.1016/j.jmst.2024.02.044
DO - 10.1016/j.jmst.2024.02.044
M3 - RGC 21 - Publication in refereed journal
SN - 1005-0302
VL - 200
SP - 1
EP - 12
JO - Journal of Materials Science and Technology
JF - Journal of Materials Science and Technology
ER -
