CRYSTALLIZATION HEAT TREATMENT FURNACE, AND CRYSTALLIZATION HEAT TREATMENT METHOD FOR ALLOY SOLIDIFIED BY QUICK CHILLING OF MOLTEN METAL

摘要

To provide a fine crystallization heat treatment furnace excellent in mass productivity and capable of obtaining a uniform fine iron-based nanocrystal structure of an alloy solidified by quick chilling of molten metal.SOLUTION: A crystallization heat treatment furnace is equipped with a furnace core tube which has an internal diameter of 10-300 mm, comprises any one of quartz, ceramic, Inconel, iron and stainless steel and is arranged to incline at an inclination of 3 to 20 degrees with respect to a horizontal direction. The furnace core tube is made to be vibratable and rotatable so that the supplied powder of alloy solidified by quick chilling of molten metal is conveyed inside, and is equipped with a heating zone and a cooling zone at the upstream side and downstream side, respectively in a conveyance direction. The furnace is characterized in that the passing speed of the above powder in the furnace core tube becomes 5 mm/sec or more but 150 mm/sec or less by giving vibration of 10 Hz or more but 200 Hz or less to the whole furnace core tube and further rotating the tube at 5 rpm or more but 200 rpm or less.SELECTED DRAWING: Figure 1