발간논문

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Vol.27, No.3, 205 ~ 214, 1989
Title
effect of Austempering Temperature on the Fracture properties of Mo - Cu Ductile iron
백승호Seung ho Baik, 강인찬in 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.
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