Microstructure characterization and mechanical behavior of laser additive manufactured ultrahigh-strength AerMet100 steel

Ultrahigh-strength AerMet100 steel thick plate was fabricated by laser additive manufacturing process. The as-deposited microstructures of the test steel were characterized using optical microscopy (OM), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray diffraction...

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Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2016-04, Vol.663, p.69-77
Main Authors: Ran, Xianzhe, Liu, Dong, Li, An, Wang, Huaming, Tang, Haibo, Cheng, Xu
Format: Article
Language:English
Subjects:
AerMet100 steel
Cracking (fracturing)
Ferrite
Fracture mechanics
Grain boundaries
High alloy steels
High strength steels
Laser additive manufacturing
Laser melting deposition
Mechanical behavior
Mechanical properties
Microstructure
Structural steels
Transmission electron microscopy
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Summary:Ultrahigh-strength AerMet100 steel thick plate was fabricated by laser additive manufacturing process. The as-deposited microstructures of the test steel were characterized using optical microscopy (OM), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray diffraction (XRD). The mechanical properties were then examined using vickers-hardness test and tensile test. Results indicate that the as-deposited microstructures of the steel mainly consist of grain boundary allotriomorphic ferrite (GBA), grain interior irregular proeutectoid ferrite, plate-like upper bainite, needle-like lower bainite and retained austenite, which result in a good strength and some ductility anisotropy. The low deformation compatibility of specimen at the transverse direction (perpendicular to the deposition direction) mainly ascribes to the poor cracking resistance of the prior-austenite columnar grain boundary with coarse GBA phases. Compared to the almost intergranular cracking taken place in the transverse tensile specimen, the fracture mode of the longitudinal tensile specimen is a mixed mode of the predominant transgranular cracking and minor intergranular cracking.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2016.03.051