Microstructural Characterization of Pure Titanium Treated by Laser Surface Treatment Under Different Processing Parameters

Can Huang^1,2，Jian Tu^1,2，Yu-Ren Wen³，Zhi Hu⁴，Zhi-Ming Zhou^1,2，An-Ping Dong⁴，Guo-Liang Zhu⁴

1. School of Materials Science and Engineering, Chongqing University of Technology2. Chongqing Municipal Key Laboratory of Institutions of Higher Education for Mould Technology, Chongqing University of Technology3. Beijing National Laboratory for Condensed Matter Physics,Institute of Physics, Chinese Academy of Sciences4. Shanghai Key Lab of Advanced High-temperature Materials and Precision Forming, Shanghai Jiao Tong University

摘 要：Advanced characterization techniques are utilized to investigate the effect of laser surface treatment on microstructural evolution of pure titanium（Ti）. The results show that there are three distinctly different types of microstructure from surface to substrate in Ti samples, including phase transformation and solidification microstructure in zone I（melting zone）; insufficient recrystallization grains with residual a martensitic plates in zone II（heat-affected zone, HAZ）; fully recrystallization microstructure in zone III（base metal, BM）. The hardness evolution profiles under different laser treatment parameters are similar.The highest hardness in MZ is ascribed to a plate, while the lowest hardness value in HAZ is due to the insufficiently recrystallized grains. The metallurgical process on the laser-modified Ti samples is systematically discussed in this work.

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