Abstract
We designed the laser local heating system for controlling microstructures including the grain boundary observation system. Two kinds of lasers were employed in this system. They were a CW laser and a short pulse laser. The CW laser was a fiber laser. The short pulse laser was a nanosecond laser. The sample was a stainless steal (Type 304) plate. Grain boundaries of the sample appeared after the irradiation of the nanosecond laser. Then, the grain could be selected for the spot heating with the fiber laser.We designed the laser local heating system for controlling microstructures including the grain boundary observation system. Two kinds of lasers were employed in this system. They were a CW laser and a short pulse laser. The CW laser was a fiber laser. The short pulse laser was a nanosecond laser. The sample was a stainless steal (Type 304) plate. Grain boundaries of the sample appeared after the irradiation of the nanosecond laser. Then, the grain could be selected for the spot heating with the fiber laser.
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