研究目的
Investigating the thermal response and melt pool characteristics during single track scanning in the laser powder bed fusion process with Ti-6Al-4V alloy.
研究成果
The study found that the melt pool width decreased with increasing scanning speed, while the melt pool length showed little difference between 200 mm/s and 400 mm/s cases. Keyhole effect at high energy density cases may contribute to the variation in melt pool length. CT scanning revealed that lower scanning speeds resulted in more pores due to keyhole formation.
研究不足
The emissivity of the material is highly variable, making it difficult to obtain true temperature measurements. The study is limited to single track scanning and does not cover the entire LPBF process.
1：Experimental Design and Method Selection:
Single track scanning with Ti-6Al-4V alloy is performed in alternate layers over the supporting base pad with scanning speeds of 200mm/s, 400 mm/s, and 600 mm/s. Thermal responses are captured using an infrared camera.
2：Sample Selection and Data Sources:
Cylindrical powder container samples with enclosed single tracks were designed to investigate internal features using computed tomography (CT).
3：List of Experimental Equipment and Materials:
EOS M270 machine, MCS640 LumaSense thermal imager, Skyscan 1173 for CT scanning, white light interferometer.
4：Experimental Procedures and Operational Workflow:
The thermal imager was used to record real-time temperature distribution. The derivative method was applied to find the liquidus-solidus transition region. CT scanning was performed to observe interior defects.
5：Data Analysis Methods:
The melt pool sizes were estimated based on the obtained liquidus-solidus transition point. Track widths were measured using white light interferometer.
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