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12% 크롬 로우터 강에서 응고속도와 가공조건이 미세 조직에 미치는 영향
최재영,강석봉,이래성 대한금속재료학회(대한금속학회) 1989 대한금속·재료학회지 Vol.27 No.1
The influence of solidification rates on the morphology and distribution of δ-ferrite and eutectic niobium carbides was studied using Bridgman-type unidirectional solidification apparatus in order to simulate the solidification pattern of a large-scale ingot of 12% chromium rotor steel. The volume fractions of the δ ferrite contained in the specimens solidified with the withdrawal speeds of 225 ㎜/hr, 45 ㎜/hr, and 4.5 ㎜/hr were measured to be 7%, 5%, and 30% respectively. δ-ferrite was finely distributed in the case of the withdrawal speeds of 225 ㎜/hr and 45 ㎜/hr, but the distribution was coarse network type in the case of the withdrawal speed of 4.5 ㎜/hr. When hot compressive working was applied in temperatures from 950℃ to 1250℃, 3-ferrite was transformed into carbides and austenite at the interface of δ-ferrite with the matrix. Subsequent heat treat melts result in a complete annihilation of δ-ferrite in the case of fast withdrawal speeds, but result in only a partial annihilation in the ca -e of the slow withdrawal speed, 4.5 ㎜/hr.
SM45C 강에 있어서 정적인 강도와 저주기 피로 특성과의 관계
김경현,김창주,최재영,이래성 대한금속재료학회(대한금속학회) 1989 대한금속·재료학회지 Vol.27 No.6
There is a tendency to generalize that the fatigue strength at 10^7-10^8 cycles in high cycle fatigue increases linearly with tensile strength, but it is not known in low cycle fatigue. This study was down to investigate the relationship between the static strength and the fatigue strength in low cycle range depending on the behavior of fatigue crack growth. In this experiment, it was shown that the fatigue strength in low cycle range also varies directly with static strength on SM45C steel.