| Title |
effect of Austempering Temperature on the Fracture properties of Mo - Cu Ductile iron |
| Authors |
백승호(Seung ho Baik); 강인찬(in Chan Kang) |
| Abstract |
The mechanical properties of ductile east iron can be significantly improved by austempering, isothermal transformation in the temperature range from Ar" to Ar` point flollowing austenitization. Fracture experiments were performed on 0.24 % Mo-0.5 % Cu alloyed ductile cast irons which were austenized for 1.5 hr at 900℃ and austempered for 2 hr in the temperature range from 280℃ to 415℃. Fracture toughness values higher than K_(IC) 80 MPa m＾(½) were obtained with the bainite ductile irons which were austempered in the range of 365 to 385℃, and then values of yield strength, elongation and hardness were in the ranges of 810 to 880 MPa, 8.8 to 10.4 % and 270 to 310 H_B, respectively. |