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ADI의 조직특성에 미치는 2단 오스테나이트화 처리조건의 영향
최석림,윤기혁,문원진,강창룡,김한군 ( S . L . Choi,K . H . Yun,W . J . Moon,C . Y . Kang,H . G . Kim ) 한국열처리공학회 1998 熱處理工學會誌 Vol.11 No.1
The variation of the mechanical properties, microstructures and the formation of retained austenite with heat treatment conditions in austempered ductile cast iron has been investigated. In the case of austempered ductile cast iron below 25㎜ diameter, it has been found that a pearlite structure are not obtained under a super cooled condition at range of 0.05℃/sec∼10℃/sec, and the matrix is precipitated in graphite, bainite and retained austenite. After austempering treatment the retained austenite is increased with decreasing cooling rate. The elongation increases with decreasing super cooling rate, and the optimum result has been shown to be the elongation of 15.6% at super cooling rate of 0.05℃/sec. The optimum result has been shown to be the tensile strength-elongation balance of 1656kgf/㎟.% and it is more than doubled to as the casting state and continuous cooling condition.