[1] Gunma Industrial Technology Center, 884-1 Kamesato-machi, Maebashi,379-2147, Japan
[2] JFE Steel Corporation, Steel Research Laboratory, 1 Kawasaki-cho, Chuo-ku, Chiba,260-0835, Japan
[3] Inoue Heat-treatment Industrial Co., Ltd., 1250-11 Izumisawa-machi, Maebashi,379-2101, Japan
[4] Fuji Syouketsugohkin Co., Ltd., 2867-2 Fujioka, Fujioka,375-0024, Japan
[5] Graduate School of Gunma University, 1-5-1 Tenjin-machi, Kiryu,376-8515, Japan