Two-Dimensional Time-Resolved X-ray Diffraction Study of Liquid/solid Fraction in Fe-C Binary System with an Electrostatic Levitator Furnace

Mitsuharu Yonemura；Junpei Okada；Yasuhiro Watanabe；Takehiko Ishikawa；Susumu Nanao；Takahisa Shobu；Ayumi Shiro；Tomoyuki Fujishiro；Hidenori Toyokawa

Chinese Journal of Physics

50卷2期（2012 / 04 / 01）

243 - 255

英文

Liquid state provides a function of matter transport or reaction field and plays an important role in manufacturing processes such as refining, forging or welding. However, experimental procedures are significantly difficult for an observation of solidification process of iron and iron-based alloys in order to identify rapid changing phenomena subjected to fast temperature evolution. Therefore, in order to study the solidification in iron and ironbased alloys, we considered a combination of high energy X-ray diffraction measurements and an electrostatic levitation method (ESL). ESL allows us to eliminate the confounding high-temperature-environment setup problems because it can levitate the specimen without a vessel in a high vacuum, and so ESL is suited to measure X-ray scattering of high temperatures or undercooled melts. In order to analyze the liquid/solid fraction, the solidification of melted spherical specimens was measured at a time resolution of 0.1 seconds during rapid cooling using the two-dimensional time-resolved X-ray diffraction. The mole fraction of solid phases was analyzed as a function of solidification time at each temperature and experimentally-studied the solidification phenomena for several seconds.