The Grain Size Evolution Mechanism of A517Q Alloy Steel Fabricated by Laser and Wire Additive Manufacturing Assisted with Different Ultrasonic Vibration Treatments
Source abstract
Abstract
Additive manufacturing (AM) usually leads to the epitaxial growth of columnar grains in the deposition layer along the construction direction, typically resulting in the decrease in mechanical properties. In this study, A517Q alloy steel was fabricated by laser and wire additive manufacturing (LWAM) assisted with ultrasonic vibration (UV) treatment. The microstructure characteristics of A517Q alloy steel under different UV affected were investigated by OM, XRD, SEM, and EBSD. Compared with the sample without UV, the percentage of equiaxed grains in samples with dual UV increased by 90%. Due to the optimization of grain structure, the tensile strength of the sample with dual UV increased by 29% and the elongation had also been improved. The results showed that due to the cavitation and acoustic flow effects of ultrasonic, the temperature gradient (G) of the molten pool reduced and the solidification rate (R) increased, thus promoting the transformation from columnar grains to equiaxed grains.
Source: crossref · Quality: baseline
Research context
OpenAlex topics: Additive Manufacturing Materials and Processes · High Entropy Alloys Studies · Additive Manufacturing and 3D Printing Technologies
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Key Laboratory of Superlight Materials & Surface Technology Ministry of Education College of Materials Science and Chemical Engineering Harbin Engineering University Harbin 150001 China
Yantai Research Institute and Graduate School of Harbin Engineering University Yantai 26401 China
Harbin Turbine Company Limited Harbin 150001 China
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