슈퍼 듀플렉스 내식강의 부식특성 및 경도에 미치는 텅스텐 첨가의 영향 (Influence of W Additions on the Corrosion Characteristics and Hardness of Super Duplex Stainless Steel)

서지정보

· 발행기관 : 한국열처리공학회
· 수록지 정보 : 열처리공학회지 / 36권 / 5호 / 261 ~ 269페이지
· 저자명 : 한윤기, 김정민

초록

This study aims to investigate the effects of tungsten additions on the microstructure, corrosion characteristics, and hardness of super duplex stainless steel heat-treated at two different annealing temperatures.
Under the annealing temperature of 1100oC, the microstructure of the stainless steels consisted mainly of ferrite, while under the annealing temperature of 1000oC, significant amounts of austenite and secondary phases were also observed. In terms of corrosion characteristics in 3.5 wt%NaCl solution, there was not a significant difference due to W addition at the 1100oC conditions. However, at the 1000oC, a tendency of decreased corrosion resistance was observed with increasing the tungsten content. On the other hand, the micro-hardness of the stainless steel heat-treated 1000oC showed an increasing trend with tungsten addition. This increase can be mainly attributed to the higher fraction of secondary phases, primarily sigma, known for their high hardness.

영어초록

This study aims to investigate the effects of tungsten additions on the microstructure, corrosion characteristics, and hardness of super duplex stainless steel heat-treated at two different annealing temperatures.
Under the annealing temperature of 1100oC, the microstructure of the stainless steels consisted mainly of ferrite, while under the annealing temperature of 1000oC, significant amounts of austenite and secondary phases were also observed. In terms of corrosion characteristics in 3.5 wt%NaCl solution, there was not a significant difference due to W addition at the 1100oC conditions. However, at the 1000oC, a tendency of decreased corrosion resistance was observed with increasing the tungsten content. On the other hand, the micro-hardness of the stainless steel heat-treated 1000oC showed an increasing trend with tungsten addition. This increase can be mainly attributed to the higher fraction of secondary phases, primarily sigma, known for their high hardness.

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