316 스테인리스강의 입계부식에 미치는 열사이클과 응력의 영향 = Effect of Thermal Cycle and Stress on the Intergranular Corrosion in 316 Stainless Steel

다국어 초록 (Multilingual Abstract)

The effects of thermal cycle condition and applied stress on the intergranular corrosion in austenitic 316 type stainless steels were investigated. Specimens were solution-treated at 1100$^{\circ}C$ for one hour and then sensitized in the temperature range of $500{\sim}800^{\circ}C$ by holding $2{\sim}300s$ with a various applied stresses of $0{\sim}8kg/mm^2$. Degree of sensitization. DOS %, was measured through polarization curve by electrochemical DL-EPR test. Microstructural observations were also conducted DOS % increased with an increase of sensitization temperature and/or holding time. Increase of applied stress resulted in increase of DOS % and more corroded surface because of acceleration of intergranular corrosion and fine grain size due to the stress. Cr depleted zone near grain boundary was observed. The amount of depletion was profounded with an increase of sensitization temperature, holding time and applied stress. $M_{23}C_6$ carbides were precipitated discontinuously at grain boundary. However, its amount was relatively small in the thermal cycle condition of 800$^{\circ}C$, 300sec and 4kg/mm$^2$.

참고문헌 (Reference)

1 "스테인리스鋼便覽" 世和 : 979-1049, 1992.

2 "ステソレス鋼 技術 デ-タ集" 143-336, 昭和57年.

3 "The Mechanism of Sensitization of Austenitic Stainless Steel" 30 (30): 135 1990-151,

4 "The Effect of Heat Treatment on the Degree of Sensitization of Type 304 Stainless Steel" 37 : 39-50, 1981.

5 "Mechanism of Deformation-Induced Grain Boundary Chromium Depletion Development in Type 316 Stainless Steel" 22a : 2917-2934, 1991.

6 "Electrochemical Methods for Testing the Intergranular Corrosion Susceptibility of Stainless Steels" 23 no. 4 : 431-440, 1983.

7 "Effect of Thermal Cycles on Corrosion Resistance in a Type of 304 Stainless Steel Journal of JWS" 33 (33): 47-54, 1964.

8 "Effect of Thermal Cycle and Corrosion Resistance in SUS 304 Stainless Steels" 43 no. 7 : 56-67, 1974.

9 "Effect of Heat Treatment on Intergranular Corrosion of AISI 304 Stainless Steel J. Corros Sci. Soc. of Korea" 21 : 239-248, 1992.

10 "Effect of Grain Size on the Intergranular corrosion property of type 304 Stainless Steel J. Corros Sci. Soc. of Korea 1950년 9월생. 부산대학교 금속공학과 졸업 1946년 10월생. 인하대학교 금속공학과 졸업" 부산대학교 금속공학과 현 부경대학교 신소재공학부 교수김무길 한국해양대학교 기관공학과 현 부경대학교 신소재공학부 교수 21 : 111-119, 1992.저자소개정병호

11 "A Review of Sensitization of Stainless Steel" 27 (27): 52-64, 1998.