서지주요정보
25Cr 계 초내식성 이상 스테인레스 강에서 W 첨가가 열 재현된 용접 열영향부 충격인성에 미치는 영향 = The effect of W addition on simulated heat-affected zone impact toughness in 25Cr-base super duplex stainless steel
서명 / 저자 25Cr 계 초내식성 이상 스테인레스 강에서 W 첨가가 열 재현된 용접 열영향부 충격인성에 미치는 영향 = The effect of W addition on simulated heat-affected zone impact toughness in 25Cr-base super duplex stainless steel / 이호.
저자명 이호 ; Lee, Ho
발행사항 [대전 : 한국과학기술원, 1997].
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소장정보

등록번호

8007441

소장위치/청구기호

학술문화관(문화관) 보존서고

MMS 97001

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초록정보

The effect of partial replacement of Mo with W on simulated heat-affected zone (HAZ) toughness in 25Cr-base super duplex stainless steels has been investigated. The materials studied were Fe-25Cr-7Ni-3Mo-0.25N and two different W-bearing alloys, 2W2Mo and 3W1.5Mo. HAZs were simulated by a FUJI thermo-mechanical simulator. The cooling time from 1200 to 800℃, $Δt_{12/8}$, was varied between 5 and 270 sec. Charpy Ⅴ-notch impact toughness, hardness, ferrite content, XRD, average grain size and microstructures of the simulated samples were studied. Cooling rate and the addition of W were found to have strong effect on the microstructure of duplex stainless steels. All the simulated alloys exhibited a decrease in toughness at fast cooling due to high proportion of ferrite and intragranular precipitates. Impact toughness also decreased at slow cooling, $Δt_{12/8} = 270sec$, because of large matrix ferrite grain size despite higer austenite content. Peak impact toughness level was observed at cooling time of 33sec for all the alloys. It was also found that the substitution of W for Mo produces high impact toughness at all cooling conditions resulting from the increased austenite content, decreased intragranular precipitates and smaller ferrite matrix grain size. In conclusion, the optimum cooling time for welding of super duplex stainless steel according to this study is $Δt_{12/8} = 20~30sec$ and the addition of W has favorable effect on HAZ properties of super duplex stainless steel.

서지기타정보

서지기타정보
청구기호 {MMS 97001
형태사항 iv, 63 p. : 삽도 ; 26 cm
언어 한국어
일반주기 저자명의 영문표기 : Ho Lee
지도교수의 한글표기 : 이혁모
지도교수의 영문표기 : Hyuck-Mo Lee
수록잡지명 : . 대한금속학회지. 대한금속학회, vol. 34, no. 12, pp. 1618-1627 (1996)
학위논문 학위논문(석사) - 한국과학기술원 : 재료공학과,
서지주기 참고문헌 : p. 61-63
주제 초내식성 이상 스테인레스 강
재현 열영향부
W 첨가
충격인성
Super duplex stainless steel
Heat-affected zone simulation
W addition
Impact toughness
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