발간논문

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Vol.27, No.12, 1104 ~ 1113, 1989
Title
Influence of Austenitizing Temperature on the Fracture Toughness
이원식Won Sik Lee, 강인찬In Chan Kang
Abstract
Effect of heat-treatment condition on the fracture behavior at the flash buttweld zone of rolled Ni-Cr-Mo steel has been studied. Specimens were austenized at 870-1200℃, and then tempered at 200-650℃. Experimental observation(specially at low tempering temperature around 250℃) fits the following relation between plain strain fracture toughness, K_Ic, and the grain size of austenite, D, K_(IC) = α+ b·D＾½ where a and b are constants. The measured a and b are 6.9 and 15.1, respectively, for the base metal, and 30 and 15.6, respectively, for the weld zone, when K_(IC) and D are given by units of MPa m＾½ and ㎛, respectively.
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