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배종인(J. I. Bae),하헌영(H. Y. Ha),강전연(J. Y. Kang),황병철(B. Hwang),이태호(T. H. Lee) 한국소성가공학회 2012 한국소성가공학회 학술대회 논문집 Vol.2012 No.5
Duplex stainless steels (DSS) composed of ferrite and austenite have an attractive combination of mechanical and corrosion properties. Commercial DSS contain a considerable amount of Ni ranging from 4 to 7 wt.%. In recent years, efforts have been made to develop lean DSS with reduce Ni which can provide substantial economical savings and improve mechanical properties due to transformation-induced plasticity. In the present study, several kinds of lean DSS with unique chemical composition were fabricated, and the mechanical and corrosion properties were investigated with precipitation behavior. Based on the results, the lean DSS developed in KIMS showed an excellent combination of strength-elongation and good corrosion resistance.
발전기용 18Cr-18Mn-N 오스테나이트계 스테인리스강의 기계적 특성에 미치는 냉간가공과 응력완화 처리의 영향
황병철(B. Hwang),배종인(J-I. Bae),하헌영(H-Y. Ha),이태호(T-H. Lee),신종호(J-H. Shin),이종욱(J-W. Lee) 한국소성가공학회 2012 한국소성가공학회 학술대회 논문집 Vol.2012 No.5
High-nitrogen 18Cr-18Mn austenitic steels have been recently developed and used for generator retaining rings which require to have non-magnetic, high strength, high ductility and good corrosion resistance. The ring materials shall be expanded by an appropriate method such as segmented dies, tapered plug and etc. in the temperature range 15 to 200℃, and stress-relief annealed at around 400℃ to achieve the required mechanical properties. This study is concerned with the effect of cold working and stress relief treatment on the mechanical properties of high-nitrogen 18Cr-18Mn austenitic steel with different N content. Although the yield and tensile strength usually increased with N content and cold working ratio, an increase in strength by cold working was dependent on the N content. The strengths also increased after stress relief treatment, which was affected by the amount of cold working. On the other hand, the ductility and impact toughness steadily decreased with cold working ratio, irrespective ofN content and stress relief treatment.