Abstract
Laser-based powder bed fusion of metals （PBF-LB/M） method, a type of additive manufacturing （AM）, is generally known as
a technology that enables fabrication of arbitrary three-dimensional shapes with layer-by-layer melting and solidification of metallic
powders using laser as a heat source. In recent years, we proposed that the PBF-LB/M method can create a unique temperature field
that achieves a directional and rapid solidification, leading to enhance functionality in various metallic materials. Such a control of
material properties and functionality could not be realized with conventional fabrication methods. This paper reviews the control of
material properties and functionality of the products developed by the PBF-LB/M method with focus on extremely high cooling rate
（~107 K/s） originated from a large thermal gradient and solidification rate.
