오스테나이트계 316L 스테인리스강의 강도 및 감쇠능에 미치는 미세조직의 영향

The effects of microstructure on the damping capacity and tensile properties of 316L stainless steel were investigated. Increasing the degree of cold working, the volume fraction of e-martensite decreased after rising to maximum value at specific level of cold working, the volume fraction of α'-martensite slowly increased and then dramatically increased from the point of decreasing e-martensite volume fraction. Increasing the degree of cold working, the behavior of damping capacity is similar to that of the e-martensite. After the damping capacity showing the maximum value at about 20% of cold rolling, damping capacity was decreased with the volume fraction of e-martensite. Tensile strength was proportional to the volume fraction of α'-martensite, and elongation steeply decreased in the range low volume fraction of α'-martensite, then slowly decreased in range the above 10% volume fraction of α'-martensite. The damping capacity and elongation is strongly controlled by the volume fraction of e martensite with liner relationship. However, the effect of the volume fraction of α'-martensite and austenite phase on the damping capacity was not observed. Tensile strength was governed by the volume fraction of α'-martensite.