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

J. Ocean Eng. Technol. 2006;20(1):1-6.

SON DONG-WOOK;LEE JONG-MOON;KIM HYO-JONG;NAM KI-WOO;PARK KYU-SEOP;KANG CHANG-YONG;

Division of Materials Science and Engineering, PKNU;Division of Materials Science and Engineering, PKNU;Division of Materials Science and Engineering, PKNU;Division of Materials Science and Engineering, PKNU;Dept. of Ceramic Science & Engineering, CNU;Div

오스테나이트계 316L 스테인리스강의 강도 및 감쇠능에 미치는 미세조직의 영향

손동욱;이종문;김효종;남기우;박규섭;강창룡;

부경대학교 신소재공학부;부경대학교 신소재공학부;부경대학교 신소재공학부;부경대학교 신소재공학부;창원대학교 세라믹공학과;부경대학교 신소재공학부;

Keywords: 316L Stainless Steel 316L, Damping Capacity, Cold Working, Volume Fraction, Tensile Strength, Elongation

핵심용어: 스테인리스 강, 감쇠능, 냉간가공, 체적분율, 인장강도, 연신율

Abstract

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 $varepsilon-martensite$ 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 $varepsilon-martensite$ volume fraction. Increasing the degree of cold working, the behnvior of damping capacity is similar to that of the $varepsilon-martensite$. After the damping capacity showing the maximum value at about $20%$ of cold rolling, damping capacity was decreased with the volume fraction of $varepsilon-martensite$. 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 $10%$ volume fraction of d-martensite. The damping capacity and elongation is strongly controlled by the volume fraction of $varepsilon$ 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.