研究目的
To conduct a comparative study on the mechanical properties of laser metal deposited (LMD) and forged Ti-6Al-4V alloy, focusing on uniaxial mechanical response and vibration fatigue properties.
研究成果
The LMD Ti-6Al-4V alloy exhibits lower uniaxial strength, shorter fatigue life, and larger dispersion in fatigue life and fracture position compared to the forged counterpart. Initial void defects within the LMD sample act as stress-concentration zones, initiating fatigue cracks. The columnar β grains contribute to anisotropy in fatigue life and crack propagation.
研究不足
The study is limited by the specific processing parameters used for LMD Ti-6Al-4V, which may affect the generalizability of the results. The vibration fatigue testing method, while innovative, may not fully replicate all real-world loading conditions.
1：Experimental Design and Method Selection:
The study involved uniaxial compression, tension, and shear tests with different strain rates, and vibration fatigue tests at frequencies of 45–50 Hz. SEM was used for micro-observation of initial microstructures and fractures.
2：Sample Selection and Data Sources:
LMD Ti-6Al-4V samples were prepared using a high-power fiber-optic laser system, and forged Ti-6Al-4V samples were purchased from BaoTi Group Co., Ltd, China.
3：List of Experimental Equipment and Materials:
Equipment included a CRIMS-DNS100 electronic universal testing machine, split Hopkinson pressure bar (SHPB), split Hopkinson tension bar (SHTB), and a vibration fatigue experimental system based on an electromagnetic excitation shaker.
4：Experimental Procedures and Operational Workflow:
Uniaxial tests were conducted at ambient temperature. Vibration fatigue tests involved designing a cantilever specimen to simulate turbine blade working conditions, with crack initiation monitored by a laser displacement sensor.
5：Data Analysis Methods:
Data from uniaxial and vibration fatigue tests were analyzed to compare mechanical properties and fatigue life between LMD and forged samples.
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