The Effects of Microstructure in Austenitic 316L Stainless Steels on the Strength and Damping Capacity

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 decreased after rising to maximum value at specific level of cold working, the volume fraction of d-martensite slowly increased and then dramatically increased from the point of decreasing volume fraction. Increasing the degree of cold working, the behnvior of damping capacity is similar to that of the . After the damping capacity showing the maximum value at about of cold rolling, damping capacity was decreased with the volume fraction of . Tensile strength was proportional to the volume fraction of d-martensite, and elongation steeply decreased in the range low volume fraction of a'-martensite, then slowly decreased in range the above volume fraction of d-martensite. The damping capacity and elongation is strongly controlled by the volume fraction of martensite with liner relationship. However, the effect of the volume fraction of d-martensite and austenite phase on the damping capacity was not observed. Tensile strength was governed by the volume fraction of d-martensite.