| Title |
Influence of Austenitizing Temperature on the Fracture Toughness |
| Authors |
이원식(Won Sik Lee); 강인찬(In 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. |