- Temperature Measurement of Laser Irradiation Area-

The layered manufacturing technique is one of the most effective processes for the manufacture of prototypes, tools and functional end products. Selective Laser Sintering (SLS) and Selective La-ser Melting (SLM), in particular, are two of the most versatile techniques, able to cover a wide range of materials such as polymer, ceramic and metal powder. In this study, the monitoring method of processing temperature at laser irradiation area by two-color pyrometer is applied. In order to in-vestigate the consolidation characteristics of chromium molybdenum steel (SCM) based powder with a Yb:fiber laser, the maximum temperature at the irradiation area of a laser beam was measured under various experimental conditions. The influence of the scan conditions of a laser beam on the maximum temperature was evaluated. As a result, it was revealed that the maximum temperature during laser irradiation changed under the influence of laser power and scan speed of a laser beam. The maximum temperature increased with the increase of laser power, and decreased rapidly to al-most at room temperature for 20 ms after the laser beam passed the center of the target area. More than the unit length 5 mm, the maximum temperature during laser irradiation was not influenced by the previous laser scan