研究目的
Investigating the Selective Laser Melting (SLM) process as a method of in-situ synthesis of Ti-5Al and Ti-6Al-4V alloys using elemental powder mixture and the effects of volume energy density on the samples’ relative density, chemical composition, microstructure and microhardness before and after heat treatment.
研究成果
The SLM process of Ti-5Al and Ti-6Al-4V elemental powder mixtures is feasible for in-situ synthesis. Volume energy density significantly affects the density, microstructure, and microhardness of the alloys. Optimal density was achieved at specific energy densities, with deviations leading to decreased density or altered microstructure. Heat treatment affects the microstructure and microhardness, with finer microstructural features observed at higher energy densities.
研究不足
The study is limited to the effects of volume energy density on Ti-5Al and Ti-6Al-4V alloys produced from elemental powders by SLM. The research does not explore other alloy systems or alternative manufacturing methods.
1：Experimental Design and Method Selection:
The study used Selective Laser Melting (SLM) technology for in-situ synthesis of Ti-5Al and Ti-6Al-4V alloys from elemental powder mixtures. Different volume energy densities were applied to study their effects on the alloys' properties.
2：Sample Selection and Data Sources:
Elemental powders of titanium (CP Ti Grade 2), aluminum (
3：9%) and vanadium (9%) were used to prepare powder mixtures of Ti-5Al and Ti-6Al-4V compositions. List of Experimental Equipment and Materials:
A tumbler mixer for powder preparation, SLM280HL machine by SLM Solutions GmbH for sample production, SEM for microstructure analysis, XRD for phase composition analysis, and hardness testing machine for microhardness measurements.
4：Experimental Procedures and Operational Workflow:
Powder mixtures were prepared and samples were produced by SLM under argon atmosphere. The effects of volume energy density on samples' properties were studied through density measurement, XRD, SEM, and microhardness testing before and after heat treatment.
5：Data Analysis Methods:
Density was calculated using metallographic technique, phase composition was analyzed using DIFFRACplus Eva software, and microhardness was measured with a hardness testing machine.
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