Fe-28Mn-2Al-3Si 합금의 진동 감쇠능 및 인장성질에 관한 연구

Abstract

The effect of grain size on the damping capacity and tensile properties of Fe-28Mn-2Al-3Si alloy studied in this paper has been investigated after changing the microstructure by cold rolling and changing grain size. The results obtained from this study as follows : Micro structures in Fe-28Mn-2Al-3Si at room temperature consist of a large quantity of austenite and a small quantity of ε and α′martensite. And ε and α′martensite was increased by increasing the degree of cold rolling Damping capacity was linearly increased with increasing ε martensite content, tensile strength was influenced by α′martensite. With increasing the grain size in Fe-28Mn-2Al-3Si alloy, strength and elongation was decreased, while damping capacity was increased due to increasing the volume fraction of ε martensite by decrement in stability of austenite phase. While tensile strength was linearly increased with increasing the degree of rolling due to transforming austenite to martensite by working, elongation was dramatically decreased at early stage of cold rolling, but slowly decreased with increasing the degree of cold rolling. With increasing the grain size, degree of decreasing of strength and elongation was small in cold rolled specimen after solution treatment then solution treated specimen.