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고 코발트-니켈 이차 경화강에서의 M2C 석출물의 성장 거동에 관한 연구 : Part 1 . 시효처리의 영향 Part 1 . Effect of Tempering Treatments
김충언,이혁모,유충화 대한금속재료학회(대한금속학회) 1995 대한금속·재료학회지 Vol.33 No.10
The effect of tempering on the growth behavior of M₂C precipitates was examined. Applied tempering temperatures were 468, 482 and 510℃, and tempering time varied from 1 to 400 hours. The value of peak hardness was HRc 55 in all temperatures and the shift of peak hardness to earlier tempering time occurred with an increase in temperature. The peak hardness was obtained, when the average length and diameter of M₂C carbides were 4∼8 ㎚ and 1.5∼2.5 ㎚, respectively. The size of M₂C carbides increased with tempering time, and the size of carbides at 510℃ was larger than that at 482 or 468℃ in all tempering time. The aspect ratio of M₂C carbides was almost 3 in all tempering conditions. The amount of precipitated austenites increased with tempering time and temperatures. Experimental studies of grow th behavior of the carbides in this steel have been made by using TEM, SEM and X-ray diffraction.
25Cr 계 초 내식성 이상 스테인레스 강에서 W 첨가가 열 재현된 용접 열영향부 충격인성에 미치는 영향
이호,이혁모,유충화 대한금속재료학회(대한금속학회) 1996 대한금속·재료학회지 Vol.34 No.12
The effect of partial replacement of Mo with W on the simulated heat-affected zone (HAZ) toughness of 25Cr-base super duplex stainless steels has been investigated, 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 higher 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 addition of W has favorable effects on HAZ toughness of 25Cr-base super duplex stainless steels.