研究目的
Investigating the non-isothermal prior β grain growth behaviour of pure titanium under laser quenching to understand the grain growth kinetics and activation energy.
研究成果
The grain size in the quenching zone was larger than in the matrix, increasing in the direction perpendicular to the isotherm. The growth activation energy of prior β grain under laser-induced non-isothermal condition is 44.4 kJ/mol, similar to isothermal conditions. The grain boundary migration behavior is the same under both conditions, but the kinetics is accelerated by high heat input from the laser beam.
研究不足
The study focuses on pure titanium, and the effects of solute drag and pinning due to second phase particles in alloys are not considered. The model assumes grain growth is dominantly controlled by diffusion and driven by surface energy.
1：Experimental Design and Method Selection:
Laser quenching was carried out on pure titanium to establish the laser-induced non-isothermal condition. The microstructure in the quenching zone was characterized using optical microscopy, SEM, TEM, and EBSD.
2：Sample Selection and Data Sources:
As-rolled pure titanium plate was annealed at 720°C for 2 h before laser quenching.
3：List of Experimental Equipment and Materials:
Laser additive manufacturing system, Kroll’s reagent, optical microscopy (Leica DM 4000), SEM (JEOL JSM-6010), TEM (JEOL JEM-2100F), EBSD (FEI NANO SEM 430).
4：0). Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: Laser quenching with specific parameters, sample preparation, and microstructure examination.
5：Data Analysis Methods:
Finite element modeling to simulate thermal history, numerical approximations for grain growth activation energy calculation.
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