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구상화 열처리한 Cr-Mo강의 오스테나이트화 온도가 기계적 성질에 미치는 영향
고도환 ( D. H. Kou ),윤지훈 ( J. H. Yoon ),박상준 ( S. J. Park ),김정민 ( J. M. Kim ),강희재 ( H. J. Kang ),성장현 ( J. H. Sung ) 한국열처리공학회 2011 熱處理工學會誌 Vol.24 No.4
Effect of austenitizing temperatures on the impact value of the AISI 4140 steel after repetition of spheroidization and cold deep drawing treatment has been studied. Sufficient dissolution of carbide was shown after austenitizing at the high temperature of 950℃. Accordingly, the impact value was remarkably increased by tempering of this high temperature austenitized steel at the tempering temperature ranges between 570℃ and 630℃. On the other hand, remarkable decrease in the impact values and elongations were shown by tempering the low temperature-austenitized(870℃) steel due to the coarsening of undissolved-carbide existed at the austenitizing temperature.
420J1 마르텐사이트계 스네인리스강의 오스테나이트화 조곤이 기계적 성질에 미치는 영향
김영주,주동원,박성훈,김기돈,성장현 ( Y . J . Kim,D . W . Joo,S . H . Park,G . D . Kim,J . H . Sung ) 한국열처리공학회 1994 熱處理工學會誌 Vol.7 No.1
To investigate the effect of austenitizing tempratures on the mechanical properties and corrosion resistance of 0.19%C-13.6%Cr martensitic stainless steel, the changes in martensitic trasformation temperatures, mechanical properties and anodic polarization curve were examined after changing the sustenitizing temperatures and tempering temperatures. On increasing heating rate at the same austenitizing temperatures, A_s, A_r and M_s increased. And the M_s temperature showed to be decreased with increasing austenitizing temperature. With increasing tempering temperature up to 500℃, strength, hardness and impact value were not changed remarkably, on the other hand the tensile strength and hardness decreased and impact value increased after tempering above 550℃ owing to the M_(23)C_6 carbide precipitation. The abrupt decrease in elongation at the tempering temperture of 500℃ proved to the precipitation of M_7C₃carbide. The effect of austenitizing temperature on the mechanical properties of the tempered specimen showed to be decreased in impact value and elongation at the austenitizing temperature of 1150℃. At low tempering temperatures the corrosion resistance of the tempered specimen was not changed obviously with increasing tempering temperature. On the other hand, the resistance decreased above the tempering temperature of 600℃ due to the precipitation of M_(23)C_6 carbides. The corrosion resistance showed to be improved with increasing the austenitizing temperature owing to the dissolution of carbides.
420J2마르텐사이트 스테인레스강의 최종경도에 미치는 열처리조건의 영향
김기돈,성장현 ( K . D . Kim,J . H . Sung ) 한국열처리공학회 1994 熱處理工學會誌 Vol.7 No.3
The effect of batch annealing conditions and austenitizing temperatures on the hardness and microstructural factors were examined by using 420J2 martensitic stainless steel. In spite of the similler hardness after batch annealing, the difference in hardness at the same austenitizing temperature was caused by changes in dissolved carbon during batch annealing. The highest hardness of the specimen was obtained at the batch annealing temperature of 820℃ and austenitizing temperature of 1050℃. The main factor affecting the final hardness of the cold annealed 420J2 specimen was proved to the austenitizing temperature rather than batch annealing temperature.
420J2 마르텐사이트계 스테인레스강의 오스테나이트화 온도가 기계적 성질에 미치는 영향
김용길,김영주,김기돈,성장현 ( Y . G . Kim,Y . J . Kim,G . D . Kim,J . H . Sung ) 한국열처리공학회 1992 熱處理工學會誌 Vol.5 No.2
For the purpose of investigating the effect of austenitizing temperatures on the mechanical properties of 0.23%C-13.6%Cr martensitic stainless steel, tensile properties, hardness, impact value and carbide extraction were examined after changing the austenitizing temperatures and tempering temperatures. The results obtained are summerized as follows. The carbide laminations formed from hot rolling before austenitization could not be eliminated after austenitizing at 950℃. With increasing austenitizing temperature, hardness increased and showed maximum value at 1050℃ and then slightly decreased. With increasing tempering temperature up to 500℃, impact value and elongation appeard to be decreased but hardness showed nearly unchanged at austenitizing temperature of 1150℃ due to the fine M_7C₃carbides precipitation. The abrupt increase in impact value, hardness and elongation above the tempering temperature of 500℃ appeared to change in carbide structure from fine M_7C₃to coarse M_(23)C_6.