2상 스테인레스 주강의 공냉 열처리 적용 가능성

김봉환; 양식; 신제식; 이상목; 문병문

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자료유형: 학술저널

저자정보: 김봉환 (한국생산기술연구원 신소재개발본부 신소재공정팀) 양식 (한국생산기술연구원 신소재개발본부 신소재공정팀) 신제식 (한국생산기술연구원 신소재개발본부 신소재공정팀) 이상목 (한국생산기술연구원 신소재개발본부 신소재공정팀) 문병문 (한국생산기술연구원 신소재개발본부 신소재공정팀)

저널정보: 한국주조공학회 한국주조공학회지 (주조) 한국주조공학회지 제26권 제1호

발행연도: 2006.1

수록면: 17 - 26 (10page)

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The substitution of cooling method from water quenching to air cooling after solution heat treatment was aimed for the development of a convenient and economical heat treatment process of duplex stainless steels without deterioration of mechanical and corrosion resistant properties for the industry. In order to achieve this goal, the mechanical properties and corrosion properties of a ASTM A890-4A duplex stainless steel were systematically investigated as functions of casting condition and cooling method after solution heat treatment. A 3-stepped sand mold and a permanent Y-block mold were used to check the effects of solidification structure and cooling rate after solution heat treatment. The microstructural characteristics such as the ferrite/austenite phase ratio and the precipitation behavior of ${\sigma}$ phase and carbides were investigated by combined analysis of OM and SEM-EDX with an aid of TTT diagram. Hardness and tension test were performed to evaluate the mechanical properties. Impact property at $-40^{\circ}C$ and corrosion resistance were also examined to check the possibility of the industrial application of this basic study. Throughout this investigation, air-cooling method was proved to effectively substitute for water-quenching process after the solution heat treatment, when the duplex stainless steel was sand mold cast with a thickness below 15 mm or permanent mold cast with a thickness below 20 mm.

#ASTM A890-4A duplex stainless steel #Solidification structure #Solution heat treatment #Cooling method #Phase ratio #${sigma}$ phase #Mechanical properties #Corrosion resistance

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