Effect of Grain Size on Thermal and Mechanical Stability of Austenite in Metastable Austenitic Stainless Steel

1) Graduate School of Engineering, Kyushu University, 744 Moto-oka, Nishi-ku Fukuoka, 819-0395 Japan. 2) International Institute for Carbon Neutral Energy Research (WPI-I2CNER), Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka, 819-0395 Japan. 3) Formerly Kyushu University. Now at Nippon Steel & Sumitomo Metal Corporation, 1-8 Fuso-cho, Amagasaki, Hyougo, 660-0891 Japan. 4) Department of Materials Science and Engineering, Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka, 819-0395 Japan.