Development of Microstructure Control of Engineering Materials Using Neutron Beam with High Intensity

工程材料的强度和可靠性与韧性一样受到微观结构的强烈影响，因此采用新的工艺方法控制微观结构是开发新型结构材料的关键问题。中子散射是研究材料加工过程中微观结构演变的新工具。在J-PARC的新中子仪器中安装了一个通常用于相变的膨胀计，用于测量Bragg衍射和小角散射。研究了先进钢的相变和析出行为，得到了许多新的发现。

Strength and reliability like toughness are strongly influenced by microstructure in engineering materials, so that novel processing for microstructure control is a key issue to develop new structural materials. Neutron scattering is a new tool to make clear microstructure evolution during material processing. A dilatometer which has been usually used for phase transformation was made to install in a new neutron instrument at J-PARC to measure Bragg diffraction as well as small angle scattering. Phase transformation and precipitation behavior in advanced steels were examined and many new findings were obtained.