研究目的
To explore a novel LSF fabrication design to produce full colony microstructure in Ti-6Al-4V-DT titanium alloy for superior fatigue crack growth resistance (FCGR).
研究成果
A full colony microstructure was obtained through proper selection of the LSF variables, leading to superior FCGR that exceeds both conventional additive manufactured and wrought Ti-6Al-4V/Ti-6Al-4V-DT specimens. This study demonstrates an innovative approach for LSFed titanium alloy with superior damage tolerance property.
研究不足
The study is limited to Ti-6Al-4V-DT titanium alloy and the specific conditions of laser solid forming. The findings may not be directly applicable to other materials or manufacturing processes.
1：Experimental Design and Method Selection:
The study focused on in situ tailoring microstructure in laser solid formed titanium alloy through processing optimization and build geometry.
2：Sample Selection and Data Sources:
Spherical Plasma-rotating Electrode Process Ti-6Al-4V powder was used for LSF processing. A series of rectangular samples with different cross-sectional areas were fabricated.
3：List of Experimental Equipment and Materials:
LSF-VI system (6 kW diode laser, coaxial powder feeder nozzle and argon purged processing chamber) was used.
4：Experimental Procedures and Operational Workflow:
Samples were fabricated using a cross-directional scanning strategy. Microstructural characterization was performed using optical microscopy (OM) and scanning electron microscopy (SEM). Fatigue crack growth experiments were performed using compact tension specimen.
5：Data Analysis Methods:
An image analysis software of Image-Pro-Plus was employed for quantitative measurement of the microstructure parameters. TEM-EDS was used for elemental analysis.
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