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pISSN : 1598-706X / eISSN : 2288-8381


(논문)연구논문

한국주조공학회지 (11권3호 228-235)

Effect of Matrix Structures on the Fracture Characteristics of Austempered Ductile Iron

오스템퍼드 구상흑연주철의 파괴특성에 미치는 기지조직의 영향

Chang-Gyu Kim*, Chang-ock Choi**

*pusan National university of Technology, **Dong-A University

Abstract

The Effects of the matrix structures and the amount of the retained austenite in austempered ductile iron(ADI) which contains Ni, Cu and Mo on fracture characteristics were inverstigated. The structures were changed from lower bainite to mixture of Lower and upper bainite, and then to upper bainite as austempering temperature increased. A higher austempering temperature yielded lower tensile strength and hardness, but higher impact valve and K_{IC}. In addition, the amount of the retained austenite increased with the austempering temperatures. Fracture surface showed a fibrous pattern and a dimple pattern with increasing the retained austenite amount.

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