The Effects of 3.5% NaCl Aqueous Solution Temperature on the Corrosion Fatigue Fracture of Dual phase steel

J. Ocean Eng. Technol. 1992;6(1):140-147.

3.5% NaCl 수용액의 온도변화가 복합조직강의 부식피로파괴에 미치는 영향

오세욱,도영문,박수영,김재철,김광영

동아대학교 기계공학과,동아대학교 기계공학과,마산전문대학교 산업안전관리과,마산전문대학교 산업안전관리과,한국기계연구소

Keywords: Dual phase steel, Corrosion fatigue fracture, Fatigue limit, Concentration Polarization, Corrosion Fatigue Crack Propagation Rate, Corrosion Pit

핵심용어: 복합조직강, 부식피로파장, 피로한도, 농도분극, 부식피로크랙전파속도, 부식피트

Abstract

Corrsion fatigue test was performed under rotated bending in 3.5% NaCl aqueous solution having a temperature from 278.deg.K in order to investigate the effects of aqueous solution remperature on the corrosion fatigue fracture of raw material steel(SS41) and dual phase steel that was produced from SS41 by a series of heat treatment. Corrosion fatigue life decreases remarkably with increase in solution temperature or with decrease in stress level. The corrosion fatigue life and the crack propagation rate at 303.deg.K show the similar behaviors with those at 318.deg.K, which is assumed to be caused by concentration polarization phenamena. The number and the lengths of microcracks increase with increase in solution temperature, so they lead to the decrease in corrosion fatigue life.