Toshiharu Fujisawa

Microstructure and Tensile Properties of ODS Ferritic Steels Produced by Mechanical Alloying in Argon and Hydrogen Gas Environments

Two types of oxide dispersion strengthened (ODS) ferritic steels have been produced by mechanical alloying (MA) either in argon or in hydrogen atmosphere, and vacuum hot pressing (VHP). A drastic reduction in the oxygen and nitrogen contents after VHP was strongly affected by hydrogen gas used as the MA atmosphere. MA in hydrogen was found to be effective for refining the steel matrix and enhancing the tensile ductility of the ODS ferritic steels.

Development of closed recycling process for low grade scrap of Al-based composite materials

Closed recycling process for low grade scrap of Al-based composite materials was developed. Flux treatment with water soluble halide is a key technique in this process. In the present work, flux treatment conditions were discussed from the viewpoint of separation and recovery of matrix, reinforce and flux materials. Optimum separation condition was obtained for the NaCI-KCI-KF flux treatment. Recovered aluminum alloy has enough quality for using various materials. Used flux is recyclable for the process by adding a small amount of KF.